Veterinary Histology and Embryology

BASED ON THE MODE OF SECRETION

This classification is based on the manner in which the secretory cells of the glands elaborate their secretion. Based on this glands are classified into Holocrine, merocrine and apocrinegland.

• In holocrine glands, the secretory products are accumulated in the cytoplasm of a cell, which disintegrates fully and constitutes the secretion secreted e.g. sebaceous gland.
• Merocrine glands elaborate secretion without losing any part of the cell e.g. salivary glands.
• In Apocrine glands, a little or the cytoplasm along the free secretory or apical borders of the cells is lost e.g. mammary gland.