A&P1: Integumentary System - Lab (USE)

Thin Skin (scalp)

Thick Skin (palm of hand)

Thin Skin (posterior hand)

Epidermis

Dermis

papillary layer of dermis

Reticular layer of dermis

subcutaneous (hypodermis) layer

Layers of the epidermis

stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum, stratum basale

Epidermis of thin skin

stratum corneum (thin skin)

the most superficial layer of the epidermis consisting of dead cells

Stratum granulosum (thin skin)

stratum spinosum (thin skin)

a layer of the epidermis that provides strength and flexibility to the skin

stratum basale (thin skin)

the deepest layer of the epidermis consisting of stem cells capable of undergoing cell division to form new cells

Epidermis of Thick Skin

Stratum Corneum (thick skin)

Stratum lucidum (thick skin)

Clear, flat, dead cells only in fingertips, palms and soles

Stratum granulosum (thick skin)

Stratum spinosum (thick skin)

stratum basale (thick skin)

Hair shaft

Hair root

Hair bulb

Hair follicle

medulla of hair

the spongy anterior core of hair that gives it flexibilty; appears as a canal in the middle of the shaft.

cortex of hair

middle layer of the hair shaft that provides strength; compromises most of the hair mass.

internal root sheath (epithelial)

External root sheath (epithelial)

Glassy membrane

layer of connective tissue that surrounds the base of the hair follicle, connecting it to the dermis

Fibrous root sheath (peripheral connective tissue sheath)

Dermal papilla

Matrix of hair follicle

cuticle

Hair papillary capillary network

Free nerve endings

respond to pain and temperature

Root hair plexus

detect hair movement

Tactile corpuscles

nerve endings that are sensitive to touch and pressure

Lamellar corpuscles

deep pressure receptors

Sebaceous glands

oil glands

ducts of eccrine sweat glands

Eccrine (merocrine) sweat glands

numerous in skin of hands, feet, forehead; ducts pass to surface of skin

pore of eccrine (merocrine) sweat gland

duct of apocrine sweat gland

apocrine sweat gland

It secretes sweat that, in action with bacteria, is responsible for human body odor.

venous blood vessels

Takes blood back to the heart

arterial blood vessels

takes blood away from the heart

adipose tissue

Tissue that stores fat.

arrestor pili muscle

A small, involuntary muscle located along the side of the hair follicle that is responsible for 'goose bumps'