4- Epithelium Glandular 241 (1)_220d03690ac42c36277c13552923596f.pptx

GLANDS Anatomy Unit  Glandular Epithelium Def: Modified type of epithelium specialized in secretion. Classification of glands: 1. According to presence or absence of duct 2. According to number of cells 3. According to branching & shape of duct and secretory part 4. According to secre...

GLANDS Anatomy Unit  Glandular Epithelium Def: Modified type of epithelium specialized in secretion. Classification of glands: 1. According to presence or absence of duct 2. According to number of cells 3. According to branching & shape of duct and secretory part 4. According to secretion According to presence or absence of duct Endocrine  No duct (Suprarenal, Thyroid & Pituitary) Exocrine  With duct (Salivary glands) Mixed  e.g Liver, Pancreas  According to number of.2 cells Unicellular  (1 cell)  (Goblet cells) Multicellular  (Many cells)  (Liver, Pancreas, Salivary glands)  According to branching &.3 The duct & the secretory part are Single & shape of duct & secretory part unbranched :a) Simple glands Simple Simple Simple coiled tubular alveolar tubular Have tubular Have flask secretory part shapes sweat glands (intestine) secretory part (male urethra)  According to branching &.3 shape of duct & secretory part :b) Simple branched glands The duct is single & unbranched The secretory part is branched I-Simple branched II-Simple branched tubular alveolar stomach sebaceous gland  According to branching &.3 shape of duct & secretory part The duct and the secretory part is C) Compound branched branched :glands III-compound I-compound II-compound branched branched branched tubulo- tubular alveolar alveolar submandibular duodenum pancreas gland  According to secretion.4 Merocrine Holocrine Apocrine The cells of the glands are The cells are shed at the The apical portions of the intact at the time of time of secretion and then cells are pinched off at the secretion replaced by new cells time of secretion Salivary glands Sebaceous glands mammary glands Nature of secretion: 1. Serous glands : watery fluid. e.g Parotid salivary glands 2. Mucous glands: secrete viscous mucus (e.g Goblet cells) 3. Muco-serous glands: Secrete both serous & mucus e.g Submandibular salivary gland 4. Sweat glands: Secrete sweat e.g Sweat glands in the skin 5. Waxy glands: Secrete secretion like the wax e.g Ceruminous glands of the ear 6. Oily glands: Secrete oily secretion e.g Sebaceous glands 7. Cellular glands: Secrete cells e.g Ovary (Ovum) & Testis (Sperms) Exocrine glands in which the acini all produce a watery secretion is an example of which type of gland? A. Serous gland B. Mixed gland C. Mucous gland D. Cellular gland