Hair follicle: sac-like anatomical
structure from which hair grows.
Sebaceous gland: gland that secretes sebum, which lubricates
the skin and hair.
Arrector pili muscle: muscle that elevates the hair.
Root of hair: part of the hair implanted in the dermis.
Papilla: part of the hair connected to the conjunctival tissue.
Inner root sheath: sheath formed of several layers of cells.
Connective tissue sheath: girdle enclosing the epithelial sheath
and connecting to the conjunctival tissue.
Epidermis: outer layer of the skin.
Hair shaft: a filament that grows from the skin.