A&P Chapter 5 Review : Integumentary System

The Three Types of Skin

Epidermis, Dermis, and Hypodermis

Specialized Cells of the Epidermis:

Keratinocytes- Make Keratin

Melanocytes- Make melanin pigment

Layers of the Epidermis

-Stratum Corneum

-Stratum Lucidum

-Stratum ganulosum

-Stratum Spinosum

-Stratum Basale (right above the dermis)

Anatomy of Skin

Layers of the Dermis

papillary layer- thin layer atop dermis

Reticular layer- thick bottom layer of dermis

Sensory Structures of Dermis

-Free nerve endings

-Lamellated corpuscle ( respond to pressure)

-Tactile Corpuscle (respond to light touch)

-Root hair plexus

Sebaceous gland

Made of stratified cuboidal epithelium

secretes sebum through hair follicles

Eccrine Sweat Gland

Widely distributed,

produces via pores to cool body down

Apocrine Sweat Gland

In axillary and pubic areas

Produces secretions that act as pheromones and empty sweat into hair follicles

Nail Body

The visible keratinized part of the nail

Eponychium

The skin folding over the corners of the nail body

Lanula

The light half moon on the nail body

Nail Matrix

Contains germinal cells that divide to produce new nail material

Nail Root

The part imbedded into the skin and attaches to the epidermis

Root Hair Plexus

A network of dendrites wrapped around the base of the hair follicle

Hair Shaft

The portion of the hair projecting out of the skin’s surface

Hair Root

The submerged portion of the nail that contains the nail bulb

Hair Follicle

Surrounds the Root

Arrector Pili Muscle

Connects to the hair follicle