Histology Guide virtual histology laboratory

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Histology Guide

Chapter 13 - Endocrine Glands

Endocrine glands secrete their hormones into the blood where they are transported to other tissues where they interact with receptors on target cells and alter their function.

Thyroid

The thyroid secrets thyroid hormone (triiodothyronine and tetraiodothyronine) that increase oxygen consumption and metabolic rates of most tissues.

EM 263 Thyroid

EM 262 Thyroid

Adrenal

The adrenal glands are found above the kidneys. The adrenal cortex is divided into three zones: zona glomerulosa, zona fasciculata, and zona reticulars. They produce a variety of hormones including adrenline and the steroids aldosterone and cortisol.

EM 299 Zona Reticulars

EM 291 Zona Fasciculata

Pituitary

The pituitary gland is often called the master gland because it controls several other hormone glands in your body, including the thyroid and adrenals, the ovaries and testicles.

Most cell types can be distinguished by the differences in morphology of their secretion granules. (More easily done by using immunohistochemistry with antibodies to different hormones.)

EM 278 GH Cell

EM 282 PRL Cell

EM 279 TSH Cell

EM 280 FSH Cell

EM 281 Castration Cell