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

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IV. Accessory Structures of the Skin: Accessory structures of the skin include hairs and two types of glands: sweat glands and sebaceous glands. Although these structures are anchored in the dermis or hypodermis, they are in fact derived from the epidermis. 1. Hair: hair itself is dead, but it’s produced by living keratinocytes at the base of the hair (hair follicles) and the pigmentation in hair comes from melanocytes (just like skin pigmentation) A. Functions: Hair serves several functions: serves as insulation; provides camouflage; sex recognition; social purposes. B. Types of hair follicles: 1) Single (simple) follicle – one hair emerges from a single opening; found in horse, cattle, pig and sheep (face, ear, distal portion of limbs) 2) Compound follicle - several hairs emerge from a single opening. Found in cat, dog, sheep (wool growing areas). Consists of a long principal (guard) hair and a n umber of smaller auxillary (wool) hairs. Hair follicles: Definition: Cylindrical depressions in the epidermis, lined with stratified squamous epithelium; hair fibers are located in the lumen of the follicle.
Auxillary Hairs Compound Hair Follicle - Cat Principal Hair
Page 1 and 2: Lecture 6 SKIN (Integumentary Syste
Page 3 and 4: III. Organization of Skin: Epidermi
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: Clinical Considerations: 4. Clinica
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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