2 what is the main connective tissue fiber present

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2. What is the main connective tissue fiber present? _collagen fibers, elastic fibers and reticular fibers._ 3. Reticular Layer - main layer of dermis a. Is this layer deep or superficial? _ deep _ b. This layer is composed of dense irregular connective tissue featuring densely packed collagen fibers. c. What is responsible for cleavage or tension lines? _langer lines of skin tension or sometimes called cleavage lines are topological lines drawn on a map of the human body. Collagen fibers in the dermis and are generally perpendicular to the orientation of the underlying muscle fibers. d. When the dermis ruptures it may produce _the collagen rips resulting is a steatch mark. 4. Papillary Layer a. The layer is named for _fingerlike projections called papillae._b. The layer is composed of _loose areolar connnective tissue _
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III. Hypodermis A. It consists of _adipose tissue_ with _dermis & _underlying tissues and organs_ B. When not part of the skin it is also called subcutaneous layer _ or _subcutaneous tissue_ Accessory Skin Structures A. Hair 1. Define the following three hair terms: a. Lanugo is fine, downy, unpigmented hair _ b. Vellus hairs _pale hair c. Terminal hairs longer, coarser, and usually more heavily pigmented. 2. Hair structure a. What part of the hair is found above the skin surface? _ shaf b. What is the name for the hair part below the skin surface? _ root_ c. What is the hair bulb? The root penetrates deeply into the dermis or hypodermis and ends with a dilation. _ d. What is the dermal root sheath? _transverse section of hair follicle_ e. What is the epithelial root sheath?_ is an extension of the epidermis it consists of stratified squamous epithelium. f. Where is the matrix found? _various connective tissue_ 1 . What is produced by the matrix? _nutrition. 3. Hair Growth a. During the growth stage _hair goes through a hair cycle anagen, catagen, and telogen. b. What happens to the hair at the end of the resting stage? _telogen_______ 4. Hair Color a. Color is due to the amount of _ melanin_ b. What causes hair color to fade or become white? _ lack of pigmentation and melanin. B. Muscles 1. What are the arrector pili? _small muscles attached to hair follicles and contraction of these muscles causes the hairs to stand on end known colloquially as goose bumps.
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2. How does hair position change when the arrector pili contract? _small muscles attached to hair follicles in mammales contraction of these muscles causes the hairs to stand on end_____ a. The raised areas produced by this movement are called 3. What two events can cause the arrector pili to contract?
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  • Fall '19
  • Stratum Corneum, APOCRINE SWEAT GLANDS, Stratum Granulosum

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