Anatomy Chapter 5
Terms
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- also called the cutaneous membrane or the integument
- skin
- the superficial, thinner portion of skin composed of epithelial tissue
- epidermis
- the deeper, thicker portion of skin composed of connective tissue
- dermis
- deep to the dermis, not part of the skin, composed of areolar and adipose tissue
- hypodermis/ subcutaneous layer
- nerve endings in the hypodermis that are sensitive to pressure
- pacinian corpuscles
- 90% of epidermal cells
- keratinocytes
- 8% of epidermal cells
- melanocytes
- attributes to skin color and protects against UV radiation
- melanin
- epidermal cells that arise from red bone marrow
- langerhans cells
- least numerous of epidermal cells, found in the deepest layer of the epidrmis
- merkel cells
- detect touch sensations, a flattened processof a sensory neuron
- merkel cells
- 3-5 layers of skin,keratohyalin, lamellar granules
- stratum granulosum
- 25-30 layers, calluses, upermost layer
- stratum corneum
- 3-5 layer, thick skin only, fingertips and such
- stratum lucidum
- stem cells, lowest level
- stratum basal
- darkyl staining granules of protein in the statum granulosum
- keratohyalin
- present in the keratohyalin
- lamellar granules
- the mechanism that regulates the incredible growth during kerainization
- epidermal growth factor
- about one fifth of the dermis, areolarconnective tisue with thin collagen and elastc fibers
- papillary region
- small finger-like structures that project into the undersurface of the epidermis
- dermal papillae
- papille sometimes contain these blood vessels
- capillary loops
- nerve endings that are sensitive to touch, corpuscles of touch
- Meissner corpuscles
- dendrites that lack any apparent structural specialization
- free nerve endings
- part of the dermis attached to the subcutaneous layer, consisting of dense irregular connective tissue containing fibroblasts, collagen, and elastic fiber
- recticular region
- ability to stretch
- extensibility
- ability to go back to original shape
- elasticity
- stretch marks due to tears in the dermis
- straie
- increase the surface area of the epidermis and increase grip
- epidermal ridges
- the study of th pattern of epidermal ridges
- dermatoglyphics
- round flat or raised are that represents a benign localized overgrowth of melanocytes
- nevus mole
- synthesis of melanin from the amino acid tyrosine in the presence of the amino acid tyronase occurs here
- melanosome
- oxygen carrying pigment inred blood cellls
- hemoglobin
- yellow-orange pigment tat gives egg yolkand carrots color
- carotene
- inherited inbility to produce melanin
- albinism
- partial or complete loss of melanocytes
- vitiligo
- homeostatic regulation of body temp
- thermoregulation
- sensations that arise in the skin
- cutaneous sensations
- eliminatin of substances from the body
- excretion
- the passage of materils from the external environment into body cells
- absorption