INTEGUMENTARY SYSTEM

                         Accessory Structures 

-Hair

         *Made of dead keratinized cells

         *Hair follicle

               -Epidermal penetration where hair originates

         *Hair shaft

               -Not anchored to follicle

               -Outside of the skin

        *Hair root

               -Attached to follicle

               -Under the skin

        *Hair bulb

               -End of the root

        *Hair matrix

               -Mitotically active basal cells inside of bulb

        *Hair papillae

               -Vascular

               -Made of connective tissue

       *Medulla

               -The core of the hair

       *Cortex

               -Hard, keratinized cells that surround medulla

        *Cuticle

               -Outermost layer of the hair

-Nails

         *Nail body

               -Protects the tips of phalanges

         *Nail bed

               -Where nail body is formed

         *Nail root

               -End of the nail body

         *Nail fold

               -Anchors the nail body to the skin

         *Nail cuticle

               -Where the fold meets the body

         *Lunula

               -The white halfmoon where the nail meets the finger

         *Hyponychium

               -The free part of the nail (furthest from cuticle)

-Sudoriferous Glands

         * “Sweat” glands

               -Eccrine sweat glands

               -Apocrine sweat glands

-Sebacous Glands

        *Sebum

               -Mix of Lipids that lubricates stratum corneum