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

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II. Functional Characteristics: 1. Protection: The most important function of the skin is its effectiveness as a barrier between the internal and external environments (guards against injury, bacterial invasion, UV damage and desiccation). 2. Regulation of body temperature: m ediated by t he hair coat, cutaneous blood supply and in some animals, sweat glands. 3. Secretion: from sweat, sebaceous and mammary glands 4. Sensory Organ: innervation of the skin provides pain, touch, pressure and temperature sensation. 5. Communication: The skin is an important organ in the social life of animals because it gives off odors that govern sexual behavior and helps animals identify each other and their territories 6. Reflects the physiological condition of the animal: skin and coat condition are good indicators of overall health and alterations may reflect a variety of external and internal disease processes (endocrine disorders, nutritional problems; i.e. Vitamin A deficiency is characterized by very dry, hardened skin, dry lack-luster hair and hair loss.)
III. Organization of Skin: Epidermis, Dermis and Hypodermis Epidermis Hair follicle = loose fascia
Page 1: Lecture 6 SKIN (Integumentary Syste
Page 5 and 6: A. Epidermal Cell Types: 1) Keratin
Page 7 and 8: 1) Keratinocytes: represent the maj
Page 9 and 10: Melanin Granules in Keratinocytes M
Page 11 and 12: 3) Langrhans cells: dendritic (immu
Page 13 and 14: 1. Epidermis B. Layers 1) Stratum G
Page 15 and 16: Layers of the Epidermis (thick skin
Page 17 and 18: C. A. Keratinization: process invol
Page 19 and 20: Melanin and keratohyalin granules
Page 21 and 22: 2. Dermis: consists of 2 layers: A.
Page 23 and 24: Clinical Considerations: 4. Clinica
Page 25 and 26: Auxillary Hairs Compound Hair Folli
Page 27 and 28: Hair Follicle: The structure from w
Page 29 and 30: 4) Hair Follicle: a) Internal Root
Page 31 and 32: 5) Arrector Pili Muscle: smooth mus
Page 33 and 34: 2. Glands of Skin: A. Sweat (sudori
Page 35 and 36: Compound Hair Follicle with sebaceo
Page 37: Cross Section of a Hair with a Seba

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

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