tailieunhanh - Ebook Textbook of histology a practical guide (2nd edition): Part 2

(BQ) Part 2 book "Textbook of histology a practical guide" presents the following contents: Digestive system, urinary system, male reproductive system, female reproductive system, respiratory system, endocrine glands, special senses. | 12 DIGESTIVE SYSTEM Introduction The digestive system consists of oral cavity and a hollow tubular gastrointestinal tract GIT plus digestive glands associated with it. The main function of the digestive system is to digest the ingested food and absorb the nutrients. ORAL cavity General Features The oral cavity is the first part of the digestive system where the food is broken into small pieces by teeth moistened and lubricated by saliva. Saliva is secreted by three pairs of major salivary glands and minor salivary glands present in the oral mucosa. The digestive enzyme amylase present in the saliva initiates carbohydrate digestion in the oral cavity. The saliva has got bactericidal action also. The oral cavity consists of two parts namely the vestibule and the oral cavity proper. The vestibule is a slit like space bounded by lips and cheeks externally and gingivae gums and teeth internally. The oral cavity proper is the large space limited anteriorly and laterally by the dental arches and superiorly by the palate. It contains the tongue which arises from the floor. The oral cavity is lined by moist oral mucous membrane or oral mucosa which is continuous with the dry skin at the mucocutaneous junction of the lips. STRUCTURE of Oral Mucosa The oral mucosa is made of covering epithelium stratified squamous epithelium and the underlying connective tissue lamina propria . It has no muscularis mucosa. The deeper part of the lamina propria that contains major blood vessels adipose and glandular tissues is often referred to as submucosa. This submucosa contains minor salivary glands which are named according to the region they are found in . labial glands in the lip buccal glands in the cheek palatine glands in the palate and lingual glands in the tongue. Sebaceous glands are occasionally seen in the lamina propria of oral mucosa. They appear as pale yellow spots called Fordyce s spots. Presence of sebaceous glands in the oral mucosa may be due to retention of parts of

• Y khoa - Dược
• Textbook of histology a practical guide
• Digestive system
• Urinary system
• Male reproductive system
• Female reproductive system
• Respiratory system
• Endocrine glands
• Histological techniques and microscopy
• Epithelial tissue
• Connective tissue
• Lymphoid tissue
• Muscular tissue
• Integumentary system
• Textbook of human histology
• Cell structure
• General connective tissue
• The mononuclear phagocyte system
• Nervous tissue
• The cardiovascular system
• The urinary organs
• The male reproductive organs
• The female reproductive organs
• The endocrine system
• Light microscopy
• Tissue preparation
• Lymphatics and lymphoid tissue
• Skin and its appendages
• Stomach and intestines
• Hepatobiliary system