Question

origin of adernal gland is​

Answer 1

Answer:

The adrenal glands develop from two separate embryological tissues; the neural crest ectoderm and the intermediate mesoderm. The medulla originates from neural crest cells migrating from sympathetic ganglion.

Answer 2

Answer:

The adrenal glands are paired bodies lying cranial to the kidneys within the retroperitoneal space. The glands consist of two layers; the cortex and medulla.

The adrenal cortex is red to light brown in colour and is composed of three zones. From the outer to inner, the layers are;

1. zona glomerulosa

2. zona fasciculata

3. zona reticularis

All these zones produce hormones derived from cholesterol, which is abundant in the cells. The adrenal cortex represents 80-90% of the adrenal gland.

The adrenal medulla is primarily involved in the production of catecholamines; epinephrine and norepinephrine. In fetal life, the adrenal medulla plays a role in the autonomic nervous system. The medulla acts as a sympathetic ganglion with the postganglionic cells lacking axons. Through sympathetic preganglionic fiber stimulation, the medullary cells secrete catecholamines. The adrenal medulla represents only 10-20% of the adrenal gland.

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