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Integumentary System

by: Cierra Beyers

Integumentary System ANAT-A215

Marketplace > Anatomy > ANAT-A215 > Integumentary System
Cierra Beyers
GPA 4.05
Basic Human Anatomy
Steve Dougherty

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About this Document

Notes covering the Integumentary System!
Basic Human Anatomy
Steve Dougherty
One Day of Notes
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This 3 page One Day of Notes was uploaded by Cierra Beyers on Monday February 2, 2015. The One Day of Notes belongs to ANAT-A215 at a university taught by Steve Dougherty in Fall. Since its upload, it has received 175 views.

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Date Created: 02/02/15
INTEGUMENTARY SYSTEM Integument covering skin largest organ of the body Integument system skin exocrine glands hair nails associated nerves associated blood vessels Layers of the Integument Epidermis o Keratinized stratified epithelium Avascular 0 Highly mitotic 0 Outer layer 0 Thick skin 5 layers 0 Thin skin 4 layers Dermis 0 Middle layer 0 Primarily dense irregular connective tissue 0 Contains nerve endings hair follicles and glands o Dermal papillae rounded elevation of tissue top of dermis Subcutaneous Layer hypodermis superficial fascia layer 0 Deepest layer 0 Stores fat and anchors upper layers to other tissues 0 Composed of areolar CT and adipose CT Layers of Epidermis Stratum Basale single layer of columnarcuboidal cells resting on the basement membrane cells are very mitotic most mitosis occurs here 0 Gobble up the uid and nutrients from the blood supply Stratum Spinosum several layers of polygonalshaped cells with spines pointed areas after dehydration Small degrees of mitosis here Stratum Granulosum 35 layers of attened cells with visible granules cells undergo keratinization here keratinization process by which the nucleus shrivels up cell dies and cell fills up with the protein keratin o By this layer the uid is nutrient poor because they are far from the blood supply Stratum Lucidum 23 layers of dead anucleated keratinized clear cells only found in thick skinVariable layer Stratum Corneum 2030 layers of dead keratinized anucleated cells cornified brittle hardened outer cells are constantly shed Cells of the Epidermis Keratinocytes epithelial cells most numerous 90 found in all layers produce keratin Melanocytes 2rld most numerous 8 only found in stratum basale produce melanin colored pigmented protein protects us from UV light Tactile Merkel Cells 3rd most numerous 1 found only in the stratum basale provide information regarding tactile light touch sensation touch changes shape of cell and it triggers the nerve it is attached to Epidermal dendritic Langerhans cells 4th most numerous less than 1 found primarily in the stratum Spinosum phagocyte Layers of the Dermis Papillary Layer uppermost composed of dermal papillae contains blood vessels sensory receptors neurons portions of the ducts of glands and hair roots Reticular Layer deepest contains blood vessels sensory receptors neurons secretory portions of glands hair follicles ducts of glands Epidermal Derivatives Skin Appendagesl Hair 0 3 parts I Bulb root and shaft once it comes out of skin 0 Arrector pili muscle smooth muscle 0 Function Protect from UV light trauma and heat loss 0 Formed from stratum orneum 0 Made of keratin 0 Function protection and grasping Exocrine glands 3 kinds 0 Sebaceous glands oil glands I Associated with hair follicles I Functions soften the skin and helps kill bacteria bactericidal o Sweat sudoriferous glands I Eccrine Found everywhere Releases perspiration sweat I Apocrine Axillary and pubic regions Secretes onto hair shafts Releases and odiferous secretion I Ceruminous cerumen earwax Modified sweat glands In external auditory canal Cerumen is an insect repellant and helps keep the eardrum soft Answer D


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