The stratum basale is similar in both tissues. A mitotic cell is present in the stratum basale. Note that the epidermis is relatively thin. The hair is indicated by the black arrow. The cat has sinus hairs on the lateral surface of the lip.
Skeletal muscle is attached to the external dermal sheath allowing voluntary control of the hair.
Nerve bundles penetrate the follicle through the trabecula making this hair highly tactile. The horn is produced by the epidermis. The equine chestnut is a vestigial remnant of the first digit located on the medial surface of equine limbs. A thick epidermis forms the overlying horn .