Anatomy of Hair This is a cross section

Anatomy of Hair

This is a cross section of a hair showing all three layers §

Image of a Hair Follicle

Each Follicle contains a muscle and a sweat gland § Arrector Pili – the muscle that lifts your hair on end when you’re cold or scared

Sebaceous gland – produces oily secretion that cleans hair

Dermis – follicle sits in the dermal layer § Directly beneath the epidermis. Packed with nerve endings and blood vessels

Hair Follicle – the organ of hair growth

Layers of Hair Follicle § Internal and External Root Sheath – molds and forms growing hair § Papilla – Actively dividing cells that produce hair § Blood Vessels – feed the growing hair § Bulb – Bottom of Hair Follicle – contains the papilla and blood vessels § Hair Shaft – Made up of Cuticle, Cortex, Medulla

Layers of the Hair Follicle

The Cuticle of Human Hair is rough --- which is why we use Conditioner

Human, Cat, Dog, Mouse § Animals have characteristic cuticle scales that scientists can use to determine the source of hair evidence

Pigment cells are found in the medulla and the cortex

Cat

Rabbit

Rabbit § Cuticle § Pattern >

Deer

Human

Ovoid bodies found in Dog Hair

Ovoid bodies are abundant in Cattle hair

Hair is made of Protein § Hair is made of keratin