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[16] Mammals.docx

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York University
BIOL 2030
Scott Kelly

Mammals Alveoli 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 scentmarking of territory Castoreum Exudate from the castor sacs of mature NA beaver a yellowish secretion used during scentmarking of terretory Cistern 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 Cuticle 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 Eutheria 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 mammals coat used to protect undercoat from elements Hair In mammals a threadlike epidermal structure consisting of cornified epithelial cells which grows by cell division from a hair follicle at its base Keratinocytes Epidermal skin cell that synthesizes keratin Lactation Secretino of milk in mammary glands Mammalia Class of homoeothermic tetrapod vertebrates in which the female produces milk from mammary glands and suckles her young Except in the egglaying 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 fourchambred hart and hair on the body The three main groups of mammals are monotremes the marsupials and the eutherians Melanin 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 Metatheria Marsupials Nipple 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 mothers young teat Ornithodelphia Monotremes mammals that lay eggs Oviparous Egglaying Pelage The hairy furry or wooly coat of mammals Placenta In mammals a doublelayered 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 gasesStratum Basale A layer of cells underneath the corneum Sebaceous Gland Glands of skin secreting oilywaxy matter called sebum to lubricatewaterproof skinhair Underhair A covering of soft downy hairs lying underneath the outer layers of an animals coat Vibrissae Stiff hair growing on nostril or face of animal as whiskers of cat or mouse often acting
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