integumentary objectives

functions of the skin

vitamin d production, protection, secretion, temperature regulation, and sensory reception

structure of skin

epidermis- stratum basale, spinosum, granulosum, lucidum, corneum

dermis - papillary, reticular

hypodermis

stratum basale

deepest layer, has melanocytes and tactile epithelial cells, nutrient rich with actively dividing cells

stratum spinosum

spiny appearance (made up of tonofilaments), contains keratinocytes and dendritic cells

stratum granulosum

waterproof due to lamellar granules, keratinocytes start to die

stratum lucidium

only in thick skin (palms and soles), made up of layers of dead keratinocytes

stratum corneum

most superficial layer, dead keratinocytes

papillary layer

superficial to the reticular layer, includes friction ridges (fingerprints)

reticular layer

80% of dermis, contains flexure and cleavage lines

root plexus

apart of the anatomy of the hair follicle. knot of sensory nerves around hair bulb

sebaceous gland

secretes sebum, found in relation to hair

eccrine gland

common sweat gland that produces true sweat

apocrine gland

found in genitality and axillary area, produces musk-like sweat that attracts a mate