Chapter 5 – Study Guide

integumentary system

dermatology

epidermis

dermis

hypodermis / subcutaneous (subQ) layer

lamellated (Pacinian) corpuscles

keratinocyte (90% of epidermal cells)

keratin

melanocyte

Langerhans cells

Merckel cells

stratum basale

stratum spinosum

stratum granulosum

stratum lucidum

stratum corneum

stratum basale à sloughing takes 4 weeks on average

papillary region of dermis

dermal papillae

Meissner corpuscles (touch receptors)

free nerve endings (warmth / coolness / pain / tickling / itching)

reticular region of dermis

hair follicles

sebaceous glands (oil glands)

sudoriferous glands (sweat glands)

what is skin color due to? (number of melanocytes? amount of melanin / melanocyte?)

melanin

carotene

hemoglobin

bilirubin

thick skin (palms, digits, soles)

thin skin (rest of body)

differences between thick & thin skin? (…in terms of epidermal ridges, hair follicles, sweat glands, sensory receptors )

arrector pilli

hair root plexuses

growth stage of hair (2-6 years)

resting stage of hair (3 months)

hirsutism

sebaceous glands (oil glands)

eccrine sweat glands

apocrine sweat glands

ceruminous glands

lunula

hyponychium

eponychium or cuticle

functions of skin: thermoregulation

functions of skin: protection

functions of skin: cutaneous sensation

functions of skin: excretion and absorption

functions of skin: synthesis of vitamin D

contact inhibition