Chapter 5 - The Integumentary System - Hair and Hair Follicles

Keratinization is complete

The shaft

Keratinization is still ongoing

The root

The body hair of children and adult females is

Vellus hair

This hair growth is pale, fine hair is

Vellus hair

hair that is shed faster than it is replaced.

Alopecia

This pulls hair upright and produces the goose bumps on skin surface.

Arrector pili muscle

The bulky layer surrounding the medulla, consists of several layers of flattened cells.

Cortex

The single layers of cells overlapping each other. Most keratinized part of the hair.

Cuticle

The wall of the hair follicle that is derived mainly from an invagination of the epidermis

Epithelial root sheath

The thickened basal lamina of the hair follicle wall

Glassy membrane

This hair structure is the deep end of the follicle

Hair bulb

This knot of sensory nerve endings is wrapped around each hair bulb.

Hair follicle receptor (root hair plexus)

This hair structure folds down from the epidermal surface into the dermis

Hair follicles

Actively dividing area of the hair bulb that produces hair in the region called the hair bulge

Hair matrix

This hair structure contains a knot of capillaries that supplies nutrients to the growing hair and signals it to grow.

Hair papilla

genetically determined, sex-influenced condition.

Male pattern baldness

The central core, consists of large cells and air space, only part of hair that is soft keratin, is absent in fine hairs.

Medulla

The hair has these three concentric layers of keratinized cells called

Medulla, Cortex, and Cuticle

The wall of the hair follicle that is derived from the dermis

Peripheral connective tissue sheath

The coarser, longer hair is

Terminal hair

The hair of the eyebrows and scalp is

Terminal hair

This hair grows in response to the stimulating effects of androgens (of which testosterone is the most important)

Terminal hair