Forelimb Grasp Reflex
Forelimb Grasp Reflex - Related Videos
09:35
Neurodevelopmental Reflex Testing in Neonatal Rat Pups
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Cited by 77 •
2017
Behavioral testing is the gold standard for determining outcomes following brain injury, and can identify the presence of developmental disabilities in infants and children. Neurodevelopmental reflexes are an early indicator of these abnormalities. A host of easily accomplished developmental reflex tests in the neonatal rodent were developed and described here.
08:59
Acquisition of a High-precision Skilled Forelimb Reaching Task in Rats
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Cited by 19 •
2015
A paradigm is presented to analyze the acquisition of a high-precision skilled forelimb reaching task in rats.
12:46
A Novel Method for Assessing Proximal and Distal Forelimb Function in the Rat: the Irvine, Beatties and Bresnahan (IBB) Forelimb Scale
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Cited by 54 •
2010
Here we will describe a rodent behavioral assay that can detect recovery of both proximal and distal forelimb function including digit movements during a naturally occurring behavior that does not require extensive training or deprivation to enhance motivation.
02:21
Direct Reconnection of Cervical Nerves to Restore Forelimb Mobility in a Mouse
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2025
Source: Gao, Z., et al. A Mouse Model of Direct Anastomosis via the Prespinal Route for Crossing Nerve Transfer Surgery. J. Vis. Exp. (2021).This video demonstrates restoring forelimb movement in a mouse via direct cervical nerve reconnection. It begins with a mouse with a paralyzed right forelimb due to a transected right C7 nerve at its nerve root. The left C7 nerve is severed, guided to the right via the prespinal route, and sutured with the right C7 nerve. The surgical site is then cleaned...
03:26
Measuring Compound Muscle Action Potentials in Mouse Forelimb Muscles In Vivo
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2025
This video demonstrates an in vivo technique for measuring compound muscle action potential (CMAP) in mice. It outlines the steps for setting up electrodes, stimulating forelimb neurons that innervate muscle fibers, and recording muscle responses. The technique assesses neuronal demyelination and functional neuron loss.
FAQs
Touch or pressure at the paw or palm activates sensory receptors, which send afferent signals through peripheral nerves to spinal sensorimotor circuits. These circuits recruit motor neurons that control forelimb flexor muscles, producing coordinated digit and limb movement. The pathway provides a compact model for examining how sensory input is converted into an immediate motor response.
Spinal sensorimotor circuits can organize the rapid motor response, while input from the brain can influence how that response is expressed. This interaction makes the reflex useful for studying both local neural circuitry and higher-level modulation of behavior. It also helps researchers distinguish an innate response from grasping actions shaped through learning.
Ongoing sensory feedback can shape the response after the initial tactile signal reaches the nervous system. Feedback provides information about continued contact with an object and can influence the resulting flexion of the digits and forelimb. Studying this adjustment helps clarify how nervous systems coordinate rapid actions while remaining responsive to changing sensory conditions.
A basic assessment applies tactile stimulation to the paw or palm and observes the resulting forelimb and digit response. Because the behavior is rapid and measurable, investigators can record whether contact produces the expected grasping movement and compare responses across experimental conditions. The same approach supports evaluation of sensorimotor function without treating the reflex as a learned task.
The response links a defined sensory input with an observable motor output, making it useful for tracking changes in sensorimotor function. Researchers can examine it during neural development or after nervous-system injury, then compare how the response changes over time. Such comparisons can provide evidence about circuit maturation, disruption, and recovery of motor control.
The reflex offers a measurable example of an innate grasp-related behavior, whereas learned grasping depends on actions shaped by experience. Comparing the two can reveal which aspects of forelimb control arise from rapid sensorimotor circuitry and which reflect learning. This distinction is relevant to behavioral studies of motor control, neural development, and recovery after injury.