University:
Kentucky State University
Course:
BIO 301 | Human Anatomy
Academic year:

2021
Views:

108

Pages:

54
Author:

imophulebf8

Glandular Epithelium (Practical) Glands are classified according to the number of cells: A. Unicellular glands • Goblet cells which are present in the lining epithelia of intestine and the respiratory tract. B. Multicellular glands • Salivary glands, lacrimal glands, sweat glands, … 2 Unicellular gland Mucus cells or goblet cells 3 • Goblet cells produce Mucin • Mucin + water  mucus • Protects and lubricates many internal body surfaces. 4 Goblet cells in the respiratory tract 5 Goblet cells in the intestine 6 Multicellular Gland Exocrine glands secrete substances to specific organ/surface via duct systems. 7 Classified according to the duct system and the secretory part Duct Simple Compound Secretory part Tubular Acinar (alveolar) Tubuloacinar 8 Exocrine pancreas, parotid Sublingual and submandibular 9 Simple exocrine glands 10 Simple tubular A single, straight tubular lumen into which the secretory products are discharged eg. mucus-secreting gland of the colon; crypt of Lieberkühn 11 12 Simple coiled tubular 13 A single tube, tightly coiled in 3 dimensions eg. Sweat glands 14 15 17 Simple branched tubular Several tubular secretory portions (T) converge onto a single unbranched duct (D) eg. Mucus-secreting gland of the stomach and uterus 18 19 Simple acinar Occur in the form of pockets in epithelial surfaces. Lined by secretory cells eg. Small mucous glands along the urethra. 20 21 Simple branched acinar Each gland consists of several secretory acini (A) that empty into a single excretory duct eg. Sebaceous glands, sebum secretion 22 23 Compound exocrine glands 25 Compound tubular Secretory portion is branched and coiled and the duct system is also Branched (difficult to visualize) eg. Brunner’s gland of the duodenum 26 27 28 Compound acinar Secretory units are acinar and drain into a branched duct system eg. Exocrine pancreas/ parotid 29 Serous gland Parotid gland 30 Serous gland Pancreas 31 Serous gland 1- serous acinus 2- islets of Langerhans ( endocrine pancreas) 3- duct 4- connective tissue septum Pancreas 32 Compound tubulo-acinar 3 types of secretory units: branched tubular, branched acinar and branched tubular with acinar endpieces called demilunes eg. salivary gland 33 34 35 Compound tubulo-acinar Mixed gland: Seromucous gland Submandibular gland 36 Compound tubulo-acinar Mixed gland: Mucoserous gland Sublingual gland 37 Serous cell Vs Mucous cell Classification on the basis of nature of secretory product 38 39 40 Mucous cells 41 Serous cells 42 Serous or mucous cells???? 43 44 ?????? ?????? 45 46 47 Classification on the basis of the mode of secretion: 48 Apocrine Mammary gland 49 Holocrine secretion (Sebaceous gland) 50 Sweat glands 51 Types of sweat glands 52 Apocrine sweat glands Eccrine sweat glands 53 Apocrine sweat glands 54