Skin and Body Membranes

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Skin and Body Membranes
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Epithelial Membranes

• Cutaneous Membrane
• Skin
• Dry Membrane
• Mucous Membrane
• Line cavities that open to exterior
• wet membranes
• Serous Membrane
• Line closed body cavities
• Helps protect organs

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Connective Tissue Membranes

• Synovial membranes
• Line the interior of joint capsules
• Provide smooth surface and secrete a lubricating
  fluid

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Epidermis

• Keratinocytes (keratin cells)
• Fibrous protein
• Protective layer
• Other Layers
• Stratum basale (deepest)
• Stratum spinosum
• Stratum granulosum
• Stratum lucidum
• Startum corneum

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Dermis

• Papillary layer
• Upper layer of dermis
• Reticular layer
• Deepest layer of skin

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Cutaneous Glands (exocrine)

• Sebaceous (oil) glands
• Releases sebum (moistens skin)
• Sebum can kill bacteria
• Sweat Glands
• Eccrine glands
• Produce sweat
• Apocrine
• Axillary and genitals only

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Hair and Hair Follicles

• Root
• Enclosed in follicle
• Shaft
• Portion outside skin
• Arrector pili
• Smooth muscle that makes your hair stand up when
  scared

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Nails

• Scalelike modification of epidermis
• Look pink because of blood supply below
• Lunula- white crescent at bottom of nail

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Infections and Allergies

• Athletes Foot
• Fungus
• Boils and Carbuncles
• Inflamed hair follicles
• Cold Sores
• Blisters caused by herpes virus

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More Infections and Allergies

• Contact Dermatitis
• Ex poison ivy
• Impetigo
• Staph infection
• Psoriasis
• Epidermal lesions

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Burns

• First Degree
• Only epidermis damage
• Second Degree
• Epidermis and upper layer of dermis
• Third degree
• Entire thickness of skin

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Skin Cancer

• Basal Cell Carcinoma
• Least malignant most common
• Squamous Cell Carcinoma
• Common on scalp, ears, dorsum of hands, and lower
  lip
• Malignant Melanoma
• Often deadly