Name: limbic brain regions and their functions
Uploaded: 2025-06-13T09:15:56.000Z
Duration: 1 min 15 s
Channel: JoVE

K12 Standards

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Ohio’s Learning Standards and Model Curriculum

9-12

Human Anatomy and Physiology

Integration And Coordination

Nervous System

Functional Brain Systems: Limbic System

The limbic system is a functional brain region consisting of specific parts of the diencephalon and cerebrum.
The limbic lobe of the cerebral cortex comprises three gyri &#8212; the cingulate, the parahippocampal, and the dentate.
The cingulate gyrus is present above the corpus callosum, and the parahippocampal gyrus lies inferiorly in the temporal lobe.
The dentate gyrus is situated between the parahippocampal gyrus and hippocampus, forming the posterior part of the limbic lobe.
The amygdaloid body, or amygdala, is an almond-shaped cerebral nucleus in the temporal lobe.
In addition, the limbic system also includes mammillary bodies of the hypothalamus, anterior and medial nuclei of the thalamus, and olfactory bulbs.
The limbic system is often called the emotional brain. The amygdala generates emotional responses to threats, while the cingulate gyrus helps express emotions through gestures.
The limbic system also responds to odor, such as an old notebook, which can evoke emotional responses and trigger associated memories.

functional brain systems: limbic system

The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain structures.
The Gyri
The limbic lobe includes three prominent gyri &#8212; the cingulate gyrus, the parahippocampal gyrus, and the subcallosal gyrus.
<ul>
	<li>&#8226; Cingulate Gyrus: The cingulate gyrus is located in the medial aspect of the cerebral hemisphere, positioned above the corpus callosum. It is involved in processing emotions and regulating behavior. It acts as a pathway connecting the amygdala and the hippocampus, which is crucial for emotional response and memory formation.</li>
	<li>&#8226;&#160;Parahippocampal Gyrus: This gyrus is situated in the inferior region of the temporal lobe next to the hippocampus, serving as an essential interface between the limbic system and sensory inputs. It comprises several subregions, notably the entorhinal, perirhinal, and postrhinal cortices, each contributing unique functions to memory processing and spatial navigation. Its extensive connections with the hippocampus establish the entorhinal-hippocampal circuit, a fundamental memory encoding and retrieval pathway. Through this intricate network, the parahippocampal gyrus facilitates the complex processes of spatial navigation and recognition memory.</li>
	<li>&#8226;&#160;Dentate Gyrus: The dentate gyrus is located between the parahippocampal gyrus and the hippocampus. It forms part of the hippocampal formation, primarily associated with memory formation and spatial navigation. It is characterized by its densely packed granule cells and generates new neurons throughout life via adult hippocampal neurogenesis. These newly formed neurons are believed to contribute to learning and memory processes, particularly pattern separation, which is the ability to distinguish between similar experiences or stimuli.</li>
</ul>
The Amygdala
Another vital component, the amygdala, is an almond-shaped nucleus within the temporal lobe known for its role in processing emotions, especially fear and anxiety. It is involved in detecting and evaluating threats in the environment, as well as in emotional learning and memory formation. The amygdala has extensive connections with other brain regions, including the prefrontal cortex, hippocampus, and hypothalamus. These connections allow the amygdala to integrate sensory information and emotional cues from the environment and coordinate appropriate behavioral and physiological responses. Its functions are critical for survival, as it generates emotional responses to threats and helps store memories of events that triggered strong emotions.
Additional Structures
In addition to these cortical areas, the limbic system includes several other structures contributing to its complex functionality. The mammillary bodies within the hypothalamus are integral for memory recall and spatial memory, indicating their importance in navigating and remembering spaces. Furthermore, the anterior and medial nuclei of the thalamus serve as vital relay stations, channeling information into the cerebral cortex and supporting emotional regulation and memory processes. The olfactory bulbs play a pivotal role in the sensory processing of smells, connecting specific scents to memories and emotions, thereby demonstrating the limbic system's significant involvement in our emotional responses to different odors.

The limbic system is a functional brain region consisting of specific parts of the diencephalon and cerebrum.
The limbic lobe of the cerebral cortex ...

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Anatomy and Physiology

Unit 1

Anatomy of the Central and Peripheral Nervous System

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KEY TERMS AND CONCEPTS

limbic brain regions and their functions

The limbic system is a deep brain network linked to emotion, memory, and sensory processing. It is often called the emotional brain because it helps connect higher mental functions of the cerebral cortex with older emotional responses from deeper brain structures. This functional region includes parts of the diencephalon and the cerebrum.

The limbic lobe includes three main gyri: the cingulate gyrus, the parahippocampal gyrus, and the subcallosal gyrus. The cingulate gyrus lies on the medial surface of the cerebral hemisphere above the corpus callosum. It helps process emotions and regulate behavior, and it also links the amygdala with the hippocampus, which is important for emotional response and memory formation.

The parahippocampal gyrus sits in the lower temporal lobe next to the hippocampus. It acts as an interface between the limbic system and sensory input. Its subregions include the entorhinal, perirhinal, and postrhinal cortices. These areas support memory processing, spatial navigation, recognition memory, and the entorhinal-hippocampal circuit for memory encoding and retrieval.

The dentate gyrus lies between the parahippocampal gyrus and the hippocampus. It is part of the hippocampal formation and is mainly tied to memory formation and spatial navigation. Its densely packed granule cells generate new neurons throughout life through adult hippocampal neurogenesis. These new neurons are thought to help learning and memory, especially pattern separation, which means telling similar experiences or stimuli apart.

The amygdala is an almond-shaped nucleus in the temporal lobe. It helps process emotions, especially fear and anxiety. It detects and evaluates threats, supports emotional learning, and helps form memories of events tied to strong feelings. Its connections with the prefrontal cortex, hippocampus, and hypothalamus let it combine sensory information with emotional cues and guide behavioral and body responses.

Other limbic structures also support memory and emotion. The mammillary bodies in the hypothalamus help with memory recall and spatial memory. The anterior and medial nuclei of the thalamus act as relay stations that send information to the cerebral cortex and support emotional regulation and memory processes. The olfactory bulbs help process smells and connect specific odors with memories and emotions.

Limbic Brain Regions and Their Functions

anatomy of the brain: major regions

Brain Regions and Their Main Functions

The human brain is the most complex organ in the body, and it is built from several major regions that work together. These regions include the cerebrum, diencephalon, cerebellum, and brainstem. Each part has a different role in how the brain processes information and controls the body. The cerebrum is the largest part of the brain. It is divided into left and right hemispheres by a deep fissure. Its outer layer is the cerebral cortex, which is gray matter. The cortex has raised folds called...

anatomy of the brain: ventricles

Brain Ventricles and Cerebrospinal Fluid

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Cerebrum: Lobes and Brain Folds

The cerebrum is the largest part of the human brain. It has an outer cerebral cortex, which is the wrinkled surface with folds called gyri and shallow grooves called sulci. Beneath the cortex is a deeper region inside each hemisphere. The cerebrum is divided into two hemispheres and five lobes. These lobes are the frontal, parietal, temporal, occipital, and insula lobes. The insula is the smallest lobe, and it lies deep within the lateral sulcus. Several sulci help separate the lobes and...

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Cerebrum Regions and Fiber Tracts

The cerebrum is organized into three main regions within each cerebral hemisphere. The outermost region is the cerebral cortex. It is a thin gray matter layer, about 2 to 4 millimeters thick, and it contains neuron cell bodies, dendrites, glial cells, and blood vessels. Beneath the cortex is the white matter. This middle region is mostly made of myelinated nerve fibers. These fibers form three large tract types: association fibers, commissures, and projection fibers. Association fibers...

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association areas of the cortex

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Association areas in the cerebral cortex help the brain combine information and make sense of it. Unlike regions with one clear sensory or motor job, these areas support memory, learning, and decision-making. They work by linking signals from multiple parts of the brain. The prefrontal association area sits in the frontal lobe. It helps with planning, decision-making, and social behavior. It also connects with primary motor areas, sensory areas, and the limbic system, which handles emotions. <br...

diencephalon: anatomical regions

Diencephalon Functions and Connections

The diencephalon links the cerebrum with the rest of the nervous system. The term means “through brain,” and the region sits deep beneath the cerebrum. The olfactory system is an exception because it connects directly with the cerebrum. The diencephalon mainly includes the thalamus, hypothalamus, and epithalamus. It also contains the subthalamus, which includes the subthalamic nucleus as part of the basal nuclei. The thalamus acts as a major relay and processing center. It contains many...

diencephalon: thalamus and information relay

diencephalon-thalamus-and-information-relay

Thalamus: Relay Centers of the Brain

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diencephalon: hypothalamus and coordination

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Hypothalamus: Brain Control and Body Balance

The hypothalamus is a small brain region that helps control many body functions. It sits at the base of the brain, above the brainstem and below the thalamus. It is part of the limbic system and connects directly with the pituitary gland through the hypothalamic-pituitary axis. The hypothalamus receives somatic inputs from the body and visceral inputs from internal organs. It uses this information to regulate important physiological activities. The region is divided into four parts:...

cerebellum: anatomical regions

Cerebellum Structure and Pathways

The cerebellum is a brain region that helps control movement, coordination, and proprioception. It lies in the posterior cranial fossa, below the tentorium cerebelli and behind the brainstem. Because of its role in motor control, it is often called the "little brain." The outer surface of the cerebellum is highly folded. It has many folia, or narrow ridges, separated by shallow sulci, or grooves. A thin midline part called the vermis divides the cerebellum into two hemispheres and helps...

brainstem

Brainstem Pathways and Life Functions

The brainstem links the brain to the spinal cord and helps control vital body functions. It sits below the brain and above the spinal cord. The brainstem has three parts: the midbrain, pons, and medulla oblongata. The midbrain lies below the diencephalon and connects the cerebrum with the lower brain regions. Its cerebral peduncles contain the crus cerebri, which hold the corticospinal tract. This tract carries signals from the cerebral cortex to the spinal cord, so it supports voluntary...

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Medulla Nuclei and Autonomic Control

The medulla oblongata is a key part of the brainstem that helps control involuntary body functions. It contains several nuclei, or clusters of nerve cells, including the olivary, cuneate, gracile, and solitary nuclei. These structures support movement, sensation, breathing, and other vital activities. The olivary nucleus, also called the inferior olivary nucleus, sits in the ventrolateral medulla. It helps with motor coordination and motor learning. It receives input from the spinal cord,...

The limbic system is a deep brain network linked to emotion, memory, and sensory processing. It is often called the emotional brain because it helps connect higher mental functions of the cerebral cortex with older emotional responses from deeper brain structures. This functional region includes parts of the diencephalon and the cerebrum. The limbic lobe includes three main gyri: the cingulate gyrus, the parahippocampal gyrus, and the subcallosal gyrus. The cingulate gyrus lies on the medial...

functional brain systems: reticular formation

functional-brain-systems-reticular-formation

Reticular Formation and the Brainstem RAS

The reticular formation is a network of gray and white matter in the brainstem. It extends from the medulla to the midbrain. Its nuclei are grouped into three main regions: raphe nuclei, medial nuclei, and lateral nuclei. The raphe nuclei lie along the midline of the brainstem. They are best known for making and releasing serotonin, a neurotransmitter that helps regulate mood, appetite, sleep, and circadian rhythms. The medial nuclei sit near the center of the reticular formation. They help...

spinal cord: gross anatomy

Spinal Cord Pathways and Protection

The spinal cord carries signals between the brain and the body. It sits inside the vertebral column, where the bones help protect it. It also supports reflexes and helps control complex motor movements. The spinal cord begins at the medulla oblongata, which is at the base of the brainstem. It extends downward and ends at the conus medullaris near the first and second lumbar vertebrae. In adults, the spinal cord is about 45 cm, or 18 inches, long. That is much shorter than the vertebral column,...

spinal cord: cross-sectional anatomy

Spinal Cord Gray and White Matter

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spinal cord: information processing

Spinal Cord Sensory and Motor Pathways

The spinal cord carries sensory signals and motor commands between the brain and the peripheral nervous system (PNS). It acts as a major relay center that helps the brain communicate with the body. In this pathway, sensory input travels upward and motor output travels downward. Sensory processing begins at receptors in the skin and other tissues. These sensory receptors detect somatic stimuli such as touch, temperature, and pain. They trigger nerve impulses that move toward the spinal cord...

peripheral nervous system: ganglia and nerves

peripheral-nervous-system-ganglia-and-nerves

Peripheral Nervous System: Signal Pathways

The peripheral nervous system links the central nervous system to the rest of the body. It includes nerves, ganglia, and sensory receptors. Together, these parts carry information between the brain, spinal cord, and the external environment. Nerves are bundles of axons that act as communication routes in the peripheral nervous system. Each nerve has an outer connective tissue layer called the epineurium. This layer protects the nerve and supports the blood vessels that supply it. Inside the...

cranial nerves: overview and anatomy

Cranial Nerves and Their Functions

Cranial nerves are 12 pairs of nerves that connect the brain to the head and neck. They carry signals between the brain and the body. Each pair is numbered with Roman numerals from I to XII, starting at the front of the brain and moving toward the back. Each nerve also has a name that reflects its function or the structure it serves. These nerves are grouped as sensory, motor, or mixed nerves. Sensory nerves detect information from the environment. Motor nerves control muscle movement. Mixed...

cranial nerves: types part i

Cranial Nerves I-VI: Eye and Face Control

Cranial nerves I through VI carry sensory and motor signals between the brain and the head and neck. The first six pairs help with smell, vision, eye movement, facial sensation, chewing, and some autonomic functions. They are key to everyday tasks like noticing odors, seeing, and moving the eyes together. The olfactory nerve, or cranial nerve I, is a purely sensory nerve for smell. It begins in the olfactory epithelium of the nasal cavity and connects to the olfactory bulb in the brain. If...

cranial nerves: types part ii

Cranial Nerves VII-XII Functions

Cranial nerves VII through XII carry motor and sensory signals between the brain and the body. These six pairs help with facial movement, hearing, balance, swallowing, speech, and control of organs in the chest and abdomen. They also support communication, expression, and autonomic control. The facial nerve, cranial nerve VII, is a mixed nerve. It controls facial expressions and carries taste from the anterior two-thirds of the tongue. It also helps control the lacrimal glands and salivary...

spinal nerves: anatomy

Spinal Nerves and Body Signals

Spinal nerves carry signals between the spinal cord and the rest of the body. They connect the central nervous system and the peripheral nervous system, which lets the body send sensory input, motor output, and autonomic signals. There are 31 pairs of spinal nerves, and each pair leaves the spinal cord through an intervertebral foramen, the opening between two vertebrae. These nerves are organized by region of the spine. The 8 cervical nerves are C1 through C8, the 12 thoracic nerves are T1...

spinal nerves: plexus i

Spinal Nerve Plexuses of the Neck and Arm

Spinal nerve plexuses are networks of interlacing nerves that organize nerve signals across the body. They act as communication hubs and are grouped into the cervical plexus in the neck, the brachial plexus in the shoulder area, the lumbar plexus in the lower back, the sacral plexus in the pelvis, and the coccygeal plexus in the coccyx region. The cervical plexus is formed by the anterior rami of the first four cervical spinal nerves, C1 to C4, with some input from C5. It lies in the neck...

spinal nerves: plexus ii

Lower Body Nerve Plexuses

The lower body nerve plexuses include the lumbar, sacral, and coccygeal plexuses. These nerve networks carry sensory information and help control motor function in the abdomen, pelvis, legs, and coccygeal region. The lumbar plexus sits in the lower back. It is mainly formed by the first four lumbar spinal nerves, L1 through L4. Its branches include the iliohypogastric, ilioinguinal, genitofemoral, lateral femoral cutaneous, femoral, and obturator nerves. These nerves send signals to the...

cranial and spinal meninges

Protective Layers Around the CNS

The cranial and spinal meninges are protective layers around the central nervous system, or CNS. The CNS includes the brain and spinal cord. These membranes help support the CNS, protect it, and help move cerebrospinal fluid, or CSF. The cranial meninges cover the cranium. The outermost layer is the dura mater, a thick membrane made of dense collagen fibers. It has two layers. The periosteal layer attaches to the inner surface of the skull, and the meningeal layer lies beneath it. The cranial...

cerebrospinal fluid

CSF Pathway and Brain Protection

Cerebrospinal fluid, or CSF, is a colorless liquid that surrounds the brain and spinal cord. It supports the central nervous system, or CNS, and helps it work properly. CSF production, flow, and absorption are tightly controlled. Most CSF is made in the choroid plexus, a network of capillaries and ependymal cells in the brain’s ventricular system. An adult usually has about 125 to 150 mL of CSF, but about 500 mL is made each day. That means the full amount is replaced about every 5 to 6 hours.

key terms and concepts

Explore the limbic system’s key brain regions, including the cingulate gyrus, hippocampus, amygdala, thalamus, and olfactory bulbs, and their roles in memory and emotion.

Limbic Brain Regions and Their Functions | JoVE K12

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Nervous System

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Limbic Brain Regions and Their Functions

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