BSCI 201 Lecture Notes - Lecture 13: Lamellar Corpuscle, Hair Follicle, Hair
7 Dec 2016
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Document Summary
2 divisions of integumentary system: skin= integument = cutaneous membrane. Composed of superficial epidermis and deeper dermis. Stratum lucidum: present only in thick skin. The dermis: contains superficial papillary layer and deep reticular layer. In thick skin, the surface of the papillary layer forms dermal ridges which form impressions on the epidermal surface called the epidermal ridges (friction ridges): increase friction and enhance gripping. Pattern of epidermal ridges (fingerprints) is genetically determined and unique to the individual. Contains messner"s corpus(cid:272)les: a(cid:272)t as tou(cid:272)h re(cid:272)eptors. Meissner"s corpuscles: papillary layer of the dermis. Root hair plexus: wrapped around the (cid:271)ase of a hair folli(cid:272)le (cid:272)alled the hair (cid:271)ul(cid:271) and it"s stimulated when the hair bends. Pacinian corpuscles: located in the reticular layer of the dermis and respond to deep pressure on skin. Suderiferous glands; simple coiled tubular multicellular exocrine glands: eccrine: 2000 located in anogential and axillary areas. Active after puberty; stimulated by sex steroid hormones.
