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Air cavity in lungs; a cavity
Apocrine Glands
Mammary glands, whose secretion accumulates beneath the surface and is released by
breaking away of the outer part of the cells
Arrector Pilli Muscle
Small m uscles attached to hair follicles in mammals; causes hairs to stand on end
Castor Gland
Beaver glands below the anus, used in scent-marking of territory
Exudate from the castor sacs of mature NA beaver, a yellowish secretion used during
scent-marking of terretory
Closed space containing fluid
Stratum Corneum
The outermost layer of the epidermis, consisting of dead cells that lack nuclei and
organelles; protect from infection, dehydration, chemicals, and mechanical stress
An outer skin or pellicle, sometimes referred to the epidermis as a whole, esp. when
impermeable to water
Eccrine Glands
Glands that secrete without disintegration of secretory cells
An infraclass of mammals, including all mammals except the monotremes and
marsupials, which are viviparous with an allatoic placenta, and have a long period of
gestation, after which the young are born as immature adults
Guard Hairs
Longest, coarsest haris in a mammal’s coat, used to protect undercoat from elements
In mammals, a thread-like epidermal structure consisting of cornified epithelial cells
which grows by cell division from a hair follicle at its base
Epidermal skin cell that synthesizes keratin
Secretino of milk in mammary glands
Class of homoeothermic tetrapod vertebrates, in which the female produces milk from
mammary glands and suckles her young. Except in the egg-laying monotremes, the
young develop inside the mother in the uterus, and are born at a more or less mature
stage. Other distinguishing characteristics of mammals are a four-chambred hart and
hair on the body. The three main groups of mammals are monotremes, the marsupials,
and the eutherians
Any of a range of black or brown pigments produced from tyrosine by the enzyme
tyrosinase and giving colour to the animal skin and hair
A structure from which a fluid emanates, a projection on the breasts or udder of a
mammal by which breast milk is delivered to a mother’s young [teat]
Monotremes: mammals that lay eggs
The hairy, furry, or wooly coat of mammals
In mammals, a double-layered spongy vascular tissue, formed from material and foetal
tissue in wall of uterus, and in which the blood vessels of mother and foetus are in close
proximity, allowing exchange of nutrients and respiratory gases.
Stratum Basale
A layer of cells underneath the corneum
Sebaceous Gland
Glands of skin secreting oily/waxy matter called sebum to lubricate/waterproof skin &
A covering of soft downy hairs lying underneath the outer layers of an animal’s coat
Stiff hair growing on nostril or face of animal, as whiskers of cat or mouse, often acting
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