Ebook Textbook of histology and a practical guide (2/E): Part 2
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: Ebook Textbook of histology and a practical guide (2/E): Part 2
Ebook Textbook of histology and a practical guide (2/E): Part 2
J J INTEGUMENTARY SYSTEMIntroductionIntegumentary system includes skin and its appendages, namely, hair and nail. Skin covers the surface of the body Ebook Textbook of histology and a practical guide (2/E): Part 2 and conies into direct contact with the external environment. It is the single heaviest organ of the body forming one-sixth of the total body weight, and its surface area is 18 sft. On close observation, the external surface of the skin shows many lines such as tension lines due to anchoring fibril Ebook Textbook of histology and a practical guide (2/E): Part 2s of dermis, flexure lines over joints and friction ridges (papillary ridges) over palm and sole. The papillary ridges and the intervening sulci on thEbook Textbook of histology and a practical guide (2/E): Part 2
e palm and sole assume a unique configuration for each individual and is used for personal identification. The study of these configurations is calledJ J INTEGUMENTARY SYSTEMIntroductionIntegumentary system includes skin and its appendages, namely, hair and nail. Skin covers the surface of the body Ebook Textbook of histology and a practical guide (2/E): Part 2nuous with the wet mucous membrane at various orifices seen on the surface of the body, viz., mouth, nostril, anus, vulva, etc.Functions of Skin•Protection: Skin gives protection against mechanical trauma, invasion of microorganisms, evaporation {water loss) and ultraviolet rays (by melanin pigments Ebook Textbook of histology and a practical guide (2/E): Part 2).•Sensory perception: Skin is the largest sense organ of the body. It contains many receptors for general sensation (pain, touch, temperature and preEbook Textbook of histology and a practical guide (2/E): Part 2
ssure).•Thermoregulation: It is mainly performed by glands {sweating) and also by blood vessels and adipose tissue.•Synthesis of vitamin D: Epidermis J J INTEGUMENTARY SYSTEMIntroductionIntegumentary system includes skin and its appendages, namely, hair and nail. Skin covers the surface of the body Ebook Textbook of histology and a practical guide (2/E): Part 2 certain catabolic nitrogenous waste products and water.•Blood pressure regulation: This is done by specialized arteriovenous anastomosis called glomus found in the dermis of the skin.•Storage: Skin acts as a storehouse for glycogen and cholesterol in the subcutaneous fat.•Absorption: Skin also abso Ebook Textbook of histology and a practical guide (2/E): Part 2rbs certain lipid soluble substances, drugs/chemicals which are of therapeutic value.Skin is useful in personal identification, especially in criminolEbook Textbook of histology and a practical guide (2/E): Part 2
ogy—through dermatoglyphics (finger print).Types of SkinThere are two types of skin:1.Thin skin or hairy skin (Fig. 11.1; Box 11.1)•Epidermis is very J J INTEGUMENTARY SYSTEMIntroductionIntegumentary system includes skin and its appendages, namely, hair and nail. Skin covers the surface of the body Ebook Textbook of histology and a practical guide (2/E): Part 2k layer of stratum corneum.•Flas no hair.•Found in palm of hand and sole of foot.190 Textbook of Histology and a Practical GuideHair (shaft)■J> Epidermis JHair txilbHair rootHair follicleDemnsSebaceous glandSweat gland (secretory part)Thin skin.Arroctor pill mưsơeFig. 11.1 Ebook Textbook of histology and a practical guide (2/E): Part 2J J INTEGUMENTARY SYSTEMIntroductionIntegumentary system includes skin and its appendages, namely, hair and nail. Skin covers the surface of the bodyGọi ngay
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