Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2
Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2
Digestive System: Oral Cavity and Salivary GlandsThe digestive system is a long hollow tube or tract that starts at the oral cavity and terminates at Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2 the anus. The system consists of the oral cavity, esophagus, stomach, small intestine, large intestine, rectum, and anal canal. Associated with the digestive tract are the accessory digestive organs, the salivary glands, liver, and pancreas, rhe accessory organs arc located outside of digestive tra Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2ct. Their secretory products are delivered to the digestive trad through excretory ducts that penetrate the digestive tract wall (Overview figure 11.1Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2
: Oral Cavity).The Oral Cavityhl the oral cavity, food is ingested, masticated (chewed), and lubricated by saliva for swallowing. Because lood is physDigestive System: Oral Cavity and Salivary GlandsThe digestive system is a long hollow tube or tract that starts at the oral cavity and terminates at Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2r or labial surface of the lips.The Lipsrhe oral cavity is formed, in part, by the lips and checks. The lips arc lined by a very thin skin covered by a stratified squamous keratinized epithelium. Blood vessels arc close to the lip surface, imparting a red color to the lips. The outer surface of the Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2lip contains hair follicles, sebaceous glands, and sweat glands. The lips also contain skeletal muscle called orbicularis oris. Inside the free marginEbook Difiore’s atlas of histology with functional correlations (7/E): Part 2
of the lip, the outer lining changes to a thicker, stratified squamous nonkcratinizcd oral epithelium. Beneath the oral epithelium are found mucus seDigestive System: Oral Cavity and Salivary GlandsThe digestive system is a long hollow tube or tract that starts at the oral cavity and terminates at Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2terlacing bundles of skeletal muscle libers. The distribution and random orientation of individual skeletal muscle libers in the tongue allows for increased movement dur ing chewing, swallowing, and speaking.PapillaeThe epithelium on the dorsal surface of the tongue is irregular or rough owing to nu Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2merous elevations or projections called papillae. These arc indented by the underlying connective tissue called lamina propria. All papillae on the toEbook Difiore’s atlas of histology with functional correlations (7/E): Part 2
ngue arc covered by stratified squamous epithelium that shows partial or incomplete keratinization. In contrast, the epithelium on the ventral surfaceDigestive System: Oral Cavity and Salivary GlandsThe digestive system is a long hollow tube or tract that starts at the oral cavity and terminates at Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2erous and smallest papillae on the surface of the tongue are the narrow, conicalshaped filiform papillae. They cover the entire dorsal surface of the tongue.236 PART II - ORGANSFungiform PapillaeLess numerous but larger, broader, and taller than the filiform papillae arc the fungiform papillae. Thes Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2e papillae exhibit a mushroom-like shape and are more prevalent in the anterior region of the tongue. Fungiform papillae arc interspersed among the fiEbook Difiore’s atlas of histology with functional correlations (7/E): Part 2
liform papillae.Circumvallate PapillaeCữuunvallatc papillae are much larger than the fungiform or filiform papillae. Eight to 12 circumvallate papillaDigestive System: Oral Cavity and Salivary GlandsThe digestive system is a long hollow tube or tract that starts at the oral cavity and terminates at Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2s excretory ducts from underlying serous (von Ebner’s) glands, located in the connective tissue, empty into the base of the furrows.Foliate PapillaeFoliate papillae are well developed in some animals but are rudimentary or poorly developed in humans.Taste BudsLocated in the epithelium of the foliate Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2 and fungiform papillae, and on the lateral sides of the circumvallate papillae, are barrel shaped structures called the taste buds. In addition, tastEbook Difiore’s atlas of histology with functional correlations (7/E): Part 2
e buds are found in the epithelium of the soft palate, pharynx, and epiglottis. The free surface of each taste bud contains an opening called the tastDigestive System: Oral Cavity and Salivary GlandsThe digestive system is a long hollow tube or tract that starts at the oral cavity and terminates at Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2tend from the base of the taste bud to the taste pore. 'I he apices of each taste cell exhibit numerous microvilli that protrude through the taste pore. The cells that are receptors for taste are closely associated with small afferent nerve fibers. Also present within the confines of the taste buds Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2are elongated supporting sustentacular cells. These cells arc not sensory. At the base of each taste bud arc basal cells. These cells are undifferentiEbook Difiore’s atlas of histology with functional correlations (7/E): Part 2
ated and are believed to serve as stem cells for the specialized cells in taste buds (Overview Figure 11.1, Oral Cavity).Lymphoid Aggregations: TonsilDigestive System: Oral Cavity and Salivary GlandsThe digestive system is a long hollow tube or tract that starts at the oral cavity and terminates at Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2The palatine tonsils are located on the lateral walls of the oral part of the pharynx. T hese tonsils arc lined with stratified squamous nonkeratinized epithelium and exhibit numerous crypts. A connective tissue capsule separates the tonsils from adjacent tissue. The pharyngeal tonsil is a single st Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2ructure situated in the superior and posterior portion of the pharynx. Il is cov cred by pseudostratified ciliated epithelium. The lingual tonsils arcEbook Difiore’s atlas of histology with functional correlations (7/E): Part 2
located on the dorsal surface of the posterior one third of the tongue. T hey arc several in number and are seen as small bulges composed of masses oDigestive System: Oral Cavity and Salivary GlandsThe digestive system is a long hollow tube or tract that starts at the oral cavity and terminates at Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2vering epithelium to form numerous crypts, around which are found aggregations of lymphatic nodules.FIGURE 11.1 ■ Lip (Longitudinal Section)T hin skin or thin epidermis (II) lines the external surface of the lip. The epidermis (11) is composed of stratified squamous keratinized epithelium with desqu Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2amating surface cells (10). Beneath the epidermis (11) is the dermis (14) with sebaceous glands (2,12) that arc associated with hair follicles (4,15),Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2
and the simple tubular sweat glands (16) located deeper in the dermis (14). The dermis (14) also contains the arrector pili muscles (3,13), smooth muDigestive System: Oral Cavity and Salivary GlandsThe digestive system is a long hollow tube or tract that starts at the oral cavity and terminates at Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2lip contains a layer of striated muscles, the orbicularis oris (5,17).CHAPTER 11 - Digestive system: Oral Cavity and Salivary Glands 237The transition zone (1) of the skin epidermis (11) to oral epithelium illustrates a mucocutaneous junction. The internal or oral surface of the lip is lined with a Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2moist, stratified,squamous nonkeratinized oral epithelium (8) that is thicker than the epithelium of the epidermis (11). Tile surface cells of the oraEbook Difiore’s atlas of histology with functional correlations (7/E): Part 2
l epithelium (8), without becoming cornified, are sloughed off (desquamated) into the fluids of the mouth (10). In the deeper connective tissue of theDigestive System: Oral Cavity and Salivary GlandsThe digestive system is a long hollow tube or tract that starts at the oral cavity and terminates at Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2 of the labial glands (9, 18) open into the oral cavity.In the underlying connective tissue of the lip are also numerous adipose cells (7), Wood vessels (6), and numerous capillaries. Because the blood vessels (6) arc very close to the surface, the color of the blood shows through the overlying thin Ebook Difiore’s atlas of histology with functional correlations (7/E): Part 2 epithelium, giving the lips a characteristic red color.1Transition zone----2Sebaceous fllands345Digestive System: Oral Cavity and Salivary GlandsThe digestive system is a long hollow tube or tract that starts at the oral cavity and terminates at Digestive System: Oral Cavity and Salivary GlandsThe digestive system is a long hollow tube or tract that starts at the oral cavity and terminates atGọi ngay
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