Skin and Superficial Fascia | Lecture Note - Edubirdie

University:
The University Of Western Ontario
Course:
Biology 2290F | Scientific Method in Biology
Academic year:

2022
Views:

107

Pages:

3
Author:

Kyuwon J.

Skin and superficial fascia ● Largest organ in the body ● Creates outer protective areas for covering ● Epidermis + dermis ● Rest on superficial fascia Functionality of the skin ● Protections ○ Mechanical ○ Chemical ○ Microbiall ● Thermoregulations ○ sweating ○ Vascodilation and constrictions ● Sensations ○ Touch ○ Pain ○ Temperatures ● Metabolic ○ Vitamin D synthesis ● Excretions ○ Sweats ● Immunological ○ Langerhans cells Epidermis ● Gen func ○ Stratified squamous keratinized epithelium ○ Avascular ○ Nutrition ■ Diffusion from dermis ○ Continuous regen Layers on Epidermis Deep⇒ superficials Stratum basale ○ Germinative layer ○ Mitosis ○ Melanocytes ● Stratum spinosums ○ Desmosomes ○ Prickle cells ● Stratum granulosums ○ Keratohyaline granules ● Stratum lucidum ○ Present only on the thick skin ■ Sole of foot ● Stratum corneum ○ Dead keratin cells Cell functions ● Eratinocytes ○ Barrier formations ● Melanocytes ○ Pigmentations ● Langerhans cells ○ Immunity and surveillance ● Merkel cells ○ Touch and other sensory receptors Derims ● Dense connective tissues ● Vascular + innervated ● Providing strength and elasticity to general skin ● Papillary layer ○ Loose CT ○ Capillaries ○ Meisseners corpucles ● Reticular layers ○ Dense irregular CT ○ Collagen ○ Elastic fibers

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