Lecture 6 SKIN (Integumentary System) Definition: The skin or ...

2. Glands of Skin:
A. Sweat (sudoriferous) glands: simple, coiled tubular glands seen as
hollow more or less circular profiles in tissue sections with walls
composed of low cuboidal epithelium. Two types:
1) Eccrine Sweat Glands: small glands that are widely distributed
and produce a watery secretion; they are mainly a mechanism
for cooling; restricted to f oot pads of carnivores, frog of
ungulates and nasolabial region of ruminants and swine.
2) Apocrine Sweat Glands: larger glands with cuboidal epithelium
that produce oily and foamy secretions; most common in the
groin, axilla and scrotum of dogs and cats; most numerous and
extensive in horses. These are the most common type found in
domestic animals.
B. Sebaceous Glands: simple, (often branched) acinar glands that
open into a ha ir follicle about halfway up the shaft; they secrete
sebum, a sec retion consisting of lysed cells and accumulated
lipids containing precursors of vitamin D. Sebum gives hair its
“sheen”. The oily sebum also acts as a lubricant for the skin and
hair.