BIOL 2001 Lecture Notes - Lecture 7: Stratified Squamous Epithelium, Loose Connective Tissue, Adipose Tissue
Document Summary
Secretion sebum; waterproof & keeps hair flexible. Epidermis outer most layer: stratified squamous epithelium, outer cells are dead, coated in keratin. Dermis middle layer: hair follicles, nerve endings, sweat glands, blood vessels, sebaceous glands. Hypodermis subcutaneous layer: loose connective tissue & adipose tissue, insulation (temperature regulator, provides. Guard hairs: outer layer of the coat, long, coarse and straight, prevents water penetration to undercoat. Wool hairs: undercoat, wavy, soft, more volume, warms and insulates the body. Tactile hair (vibrissae: commonly known as whiskers, long, coarse and mainly found on the head, associated with sensory organs; nerve endings. Grow off of a bone coming from the skull. In many species, only the males have antlers. Feathers: flight, derived from epidermal cells similar to hair. Beak: modified epidermis, similar to nail structure. Scales: exoskeleton which provides protection, scales are thick, keratinized skin. Primarily caused by allergies in dogs/cats, secondarily auto immune diseases. Dermatology the study of the skin and skin conditions.
