Adrenal Medulla
Adrenal Medulla - Related Videos
01:27
Sympathetic Pathways: Collateral Ganglia and Adrenal Medulla
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2025
The sympathetic pathways of the collateral ganglia and adrenal medulla serve unique but interconnected roles in the sympathetic response. Collateral Ganglia Sympathetic preganglionic axons reach the collateral ganglia along the route of splanchnic nerves. These nerves bypass the sympathetic trunk and communicate with sympathetic postganglionic neurons housed in the prevertebral ganglia. These ganglia supply the organs of the abdominopelvic cavity. The greater splanchnic nerve, formed by the...
04:27
Analyzing Dendritic Morphology Across Drosophila Medulla Layers and Columns
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2025
Source: Ting, C., et al., Analyzing Dendritic Morphology in Columns and Layers. J. Vis. Exp. (2017)This video demonstrates the procedure of preparing a Drosophila brain, capturing horizontal and frontal image stacks of GFP-labeled medulla dendrites under a confocal microscope, and creating a 3D reconstruction to analyze their morphology across layers and columns.
06:08
A Novel Method: Super-selective Adrenal Venous Sampling
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Cited by 44 •
2017
'Super-selective' adrenal venous sampling (ssAVS, also called segmental adrenal venous sampling: sAVS) was performed using a micro-catheter to identify adrenal segment(s) that produce excessive amounts of hormones. The ssAVS technique was described, cases in which adrenal segmental lesion(s) were identified by ssAVS were presented, and the usefulness of ssAVS in future adrenal research was discussed.
08:02
Fecal Glucocorticoid Analysis: Non-invasive Adrenal Monitoring in Equids
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Cited by 6 •
2016
Adrenal activity can be assessed in the equine species by analysis of feces for corticosterone metabolites. The method offers a non-invasive option to assess long term patterns in both domestic and free ranging horses. This protocol describes the enzyme linked immunoassay involved and the associated biochemical validation.
01:17
Anatomy of the Adrenal Glands
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2024
The adrenal or supra-renal glands, situated above the kidneys and aligned with the twelfth rib, are paired pyramid-shaped structures crucial for the body's stress response. During stress, these glands secrete hormones vital for adaptive physiological reactions. These glands possess a distinctive yellow tinge due to the stored cholesterol and fatty acids required for hormone synthesis. They are encased in a fibrous capsule and cushioned by fat. The adrenal gland comprises two distinct regions...
FAQs
Sympathetic nerve fibers initiate secretion by releasing acetylcholine onto chromaffin cells. This signal converts neural activity into an endocrine response because the cells release epinephrine and norepinephrine into the bloodstream. Circulation then distributes these catecholamines, allowing a stress signal that begins in nerves to influence cardiovascular function and energy availability throughout the body.
Epinephrine and norepinephrine are released together as the medullary output described in the overview. Their circulating action is associated with increased heart rate, greater blood flow to muscles, and increased energy availability. This combination helps coordinate several body changes at once, rather than producing an isolated response in a single tissue.
The adrenal medulla illustrates how the sympathetic nervous system can produce both speed and reach. Nerve signaling supplies the rapid trigger, while hormone release carries the response through the bloodstream. That neural-endocrine connection matters for stress physiology because it links immediate regulation with broader changes relevant to maintaining homeostasis.
Studying the adrenal medulla helps biologists connect cellular signaling, organ function, and whole-body regulation. Investigations can examine how acetylcholine-driven activity leads to catecholamine secretion and how that secretion relates to heart rate, muscle blood flow, and energy availability. The topic therefore provides a focused model for understanding stress physiology and homeostasis.
Its importance comes from its role in catecholamine production. The overview identifies pheochromocytoma as a tumor-related disorder involving this system, so studying the medulla provides biological context for understanding how abnormal catecholamine production may connect with cardiovascular or metabolic changes. This makes the tissue relevant to disease-focused biology and stress-related research.
The connection is demonstrated by a sequence rather than by either system alone: sympathetic fibers provide acetylcholine, chromaffin cells respond by secreting hormones, and the bloodstream distributes the signal. Examining that sequence helps explain how neural control can generate coordinated cardiovascular and metabolic effects during stress, linking nervous-system signaling with endocrine regulation.