Question
Explain the differences between the adrenal cortex and the adrenal medulla.
| S. No. | Adrenal Cortex | Adrenal Medulla |
| 1. | It is external firm region of the adrenal gland. | It is central soft region of the adrenal gland. |
| 2. | It is pale yellowish-pink in colour. | It is dark reddish-brown in colour. |
| 3. | It is enclosed by a fibrous capsule. | It is not enclosed by a fibrous capsule. |
| 4. | It forms about 80% of the adrenal gland. | It forms just 20% of the adrenal gland. |
| 5. | It develops from the mesoderm. | It develops from the ectoderm (neural crests). |
| 6. | It consists of 3 concentric regions: Outer zona glomerulosa, middle zona fasiculata and inner zona reticularis. | It is not differentiated into regions. |
| 7. | It is essential for life, its destruction causes death. | It is not essential for life, its destruction does not cause death. |
| 8. | It secretes 3 groups of hormones : mineralocorticoids, glucocorticoides and gonado corticoids. | It secretes 2 similar hormones nor adrenaline and adrenaline. |
| 9. | It is stimulated to release its hormones by the adrenocorticortrophic hormone from the anterior pituitray. | It is stimulated to secrete its hormones by nerve impulses reaching via sympathetic nerve fibres. |
| 10. | There is no cooperation between adrenal cortex and sympathetic nervous system. | Adrenal medulla and sympathetic nervous system function as an integrated system called sympatheticoadrenal system. |
| 11. | It causes many deficiency/excess disorders. | It is not known to cause any disorder. |
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