Term Name:	hair inner root sheath
Synonyms:	hair follicle inner root sheath, inner root sheath, inner root sheath of hair follicle, inner sheath of hair follicle, internal root sheath of hair follicle
Definition:	A multilayered tube composed of terminally differentiated hair follicle keratinocytes that is surrounded by the outer root sheath; the layers of the inner root sheath include the companion layer, Henle's layer, Huxley's layer and the inner root sheath cuticle[MP].
Ontology:	Cell Ontology [UBERON:0005941]