Skin Structure and function sdl

Identify the anatomical features of normal skin and hair List the functions of the skin and the adaptations of structure that allow these functions

labelled diagram of the skin and hair follicule

How do you tell the difference between the 3 type of glands / follicules.

Sweat gland = circle + hollow

Hair bulbs = dark filled circles

Sebaceous gland = granular

What is the follicular ostium

Small opening at the top of the hair canal which connects the skin to the outside hair

What are the functions of the skin

Protective barrier

chemical barrier — Phospholipid Bilayer

skin microbiome - Lipid to fatty acids to support flora, + commensals to support the microbiome..

tempereatire regularion

photoreceprion - Melanin and nuclear capping

excretory organ - SWEAT

sensory organ

immunosurvelience

vit D

stores nutrients

absorptive surface

Lamgheran cells + mechanisms for storage + immunosurveilance..

Labelled diagram of the skin function

Epidermis — Free nerve endings, hair shaft, medulle a, corte

Sebaceous gland = oil producing + attatched to the hair follicule…

DERMIS —sensory neurones + encapsulated nerve endings, pacinian corpuscle, dermal papilla.. (projection of epidermis linking with the fermis)

Subcutis/ hyPOdermis — lippcyte/ hypodermis/ subcutis, sympathetic nerve.. nensory neurone + free nerve ends..

Skin natural immunosurveilance

• langerhan cells

• kcs

• hypersensitivity

• dermal dentritdes

• t cells

• mast cellls

Where and how is Na+ sptred in the skin..

Regulated by immune system and local lmph capilaries

lAbel this diagram

major skin and hAIR FUNCTIONS