Medical Sciences 3999A/B/Y Lecture Notes - Lecture 26: Stratified Squamous Epithelium, Common Bile Duct, Pancreatic Duct
20 Feb 2020
School
Department
Professor
Document Summary
Have lubricative, protective, digestive and absorptive functions mediated by their secretory products, which are released into oral cavity and duodenum. Major - parotid, submandibular and sublingual (branched tubuloalveolar) Associated with oral cavity through independent excretory ducts. Glands surrounded by ct capsule - rich in collagen fibres. Ct septa from capsule penetrate glands => lobules. Vascular and nervous plexus surround secretory and ductal components of each lobule. Secretory end pieces present two types of secretory cells (serous and mucous) as well as non-secretory myoepithelial cells. Components modify and conduct saliva to oral cavity. Saliva: contains proteins, glycoproteins (mucous), ions, water and iga. Under the control of ans; stimulation results in: Mucous and water in saliva lubricate mucosa of tongue, cheek and lips during speech and swallowing - dissolves for taste-bud function and moistens for swallowing. Protective function depends on 3 antibacterial salivary components: Lactoferrin - chelates iron to prevent bacterial growth.
