Accessory Structures

Question 1

Nail

Answer 1

-grow from nail matrix which is formed from stratum basale
-linula is matrix visible beneath body of nail
-made up of heavily keratinized/dead cells

Question 2

Hair

Answer 2

-hair follicles found ONLY in thin skin and form hair
-portion of hair enclosed by follicle is root
-bulk of hair shaft is composed of dead/keratinized cells
-portion of hair extending from surface to epidermis is the shaft

Question 3

Hair Follicle

Answer 3

Consist of hair bulb, hair papilla, melanocytes, cortex, medulla, cuticle, and hair matrix

Question 4

Hair papilla

Answer 4

-dermal tissue extending into base of hair root and provides nutrients to hair matrix
-part of hair follicle

Question 5

Hair matrix

Answer 5

-part of hair follicle
-region of dividing cells that provides new growth to hair

Question 6

Arrector Pili Muscle

Answer 6

-bundle of smooth muscle attached to hair follicle
-cause of goosebumps due to muscle contracting in response to stimuli