Veterinary Histology and Embryology

ENDOCRINE GLANDS

• Certain glands are lacking in ducts and are termed endocrine glands.
• The endocrine glands secrete specific chemical substance called hormones which have specific effects on the other tissue or organs of the body e.g., thyroid, parathyroid, pituitary etc.

• The secretions of these glands are conveyed directly into the blood stream.
• To facilitate this endocrine glands have numerous sinusoids forming an extensive network, surrounding the secretory cells, which are usually arranged in small groups, follicles or anatomizing cords of cells.