Reconnect to chapter 11 Sympathetic Division page 438

H Describe the location and structure of the adrenal glands.

^9 Name the hormones the adrenal medulla secretes.

^9 What general effects do hormones secreted by the adrenal medulla produce?

Q What usually stimulates release of hormones from the adrenal medulla?

What Hormone Stimulates Adrenal Medulla

glomerulosa

Figure 13.26

(a) An adrenal gland consists of an outer cortex and an inner medulla. (b) The cortex has three layers, or zones, of cells.

glomerulosa fasciculata reticularis

Figure 13.26

(a) An adrenal gland consists of an outer cortex and an inner medulla. (b) The cortex has three layers, or zones, of cells.

Hormones of the Adrenal Cortex

The cells of the adrenal cortex produce more than thirty different steroids, including several hormones (cortico-steroids). Unlike the adrenal medullary hormones, without which a person can survive, some of those released by the cortex are vital. In fact, in the absence of adrenal cortical secretions, a person usually dies within a week if he or she does not receive extensive electrolyte therapy. The most important adrenal cortical hormones are aldo-sterone, cortisol, and certain sex hormones.

Zona glomerulosa

Zona fasciculata

Zona reticularis

Chromaffin cells

Light micrograph of the adrenal medulla and the adrenal cortex (75x).

Zona glomerulosa

Zona fasciculata

Zona reticularis

Chromaffin cells ure 13.2,

Figure

Light micrograph of the adrenal medulla and the adrenal cortex (75x).

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