Adrenal medulla

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Adrenal medulla

Medulla labeled at bottom right.
Gray's	subject #277 1280
Artery	superior suprarenal artery, middle suprarenal artery, Inferior suprarenal artery
Vein	suprarenal veins
Nerve	celiac plexus, renal plexus
Lymph	lumbar glands
Precursor	Neural crest

The adrenal medulla is part of the adrenal gland. It is located at the center of the gland, being surrounded by the adrenal cortex.

1 Function
2 Origin
3 Pathology
4 See also
5 References
6 External links

[edit] Function

Composed mainly of hormone-producing chromaffin cells, the adrenal medulla is the principal site of the conversion of the amino acid tyrosine into the catecholamines adrenaline (epinephrine) and noradrenaline (norepinephrine).

In response to stressors such as exercise or imminent danger, medullary cells release catecholamines into the blood in a 85:15 ratio of adrenaline to noradrenaline. ^[1]

Notable effects of adrenaline and noradrenaline include increased heart rate, blood vessel constriction, bronchiole dilation, and increased metabolism, all of which are characteristic of the fight-or-flight response.

[edit] Origin

Medullary cells are derived from the embryonic neural crest and, as such, are simply modified neurons.

In particular, they are modified postganglionic cells of the sympathetic nervous system that have lost their axons and dendrites, receiving innervation from corresponding preganglionic fibers.

Moreover, as the synapses between pre- and postganglionic fibers are called ganglia, the adrenal medulla is actually a ganglion of the sympathetic nervous system.