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1 Tunica muscularis. Bilayered muscle wall of colon. B

2 Longitudinal layer. Stratum longitudinale. Distinct outer layer of longitudinally oriented muscle of variable thickness. B

3 Taeniae coli. About 1 cm wide, thickened bands of longitudinal muscle fibers. B

4 Taenia mesocolica. Tenia located at the attachment of the mesocolon in the posteromedial

Ipart of the ascending and descending colon. A

5 Taenia omentalis. Tenia of transverse colon located at the attachment of the greater omentum in the posteromedial part of the ascending and descending colon. A

6 Taenia libera. Free tenia located between the tenia mesocolica and tenia omentalis. A

7 Circular layer. Stratum circulare. Inner layer of circularly coursing muscle fibers of the colon. B

8 Tela submucosa. Displaceable layer between the muscularis mucosa and the muscularis,con-sisting mainly of collagenous connective tissue containing nerves and blood vessels. B

9 Tunica mucosa. Villus-free mucous coat of the colon comprised of simple, goblet-cell rich, columnar epithelium, connective tissue and lamina muscularis mucosae. B

10 Lamina muscularis mucosae. Layer ofsmooth muscle cells between the lamina propria and submucosa. Its contraction produces a wrinkling of the mucosa. B

11 Intestinal glands. Glandulae intestinales. Tubular glands of the colonic mucosa. B

12 Solitary lymphatic nodules. Nodi lymphatici solitarii. Individual lymphatic nodules dispersed throughout the lamina propria. B

13 RECTUM. Tenia-free segment, about 15 cm long, located between the sigmoid colon and the anus. C

14 Sacral flexure. Flexura sacralis. Anteriorly concave bend in the rectum that conforms with the sacrum. C

15 Perineal flexure. Flexura perinealis. Anteriorly convex bend in the rectum located just above the anus. C

16 Ampulla recti. Dilated portion of the rectum above the anal canal. C

17 Tunica muscularis. Muscular wall of rectum. C

18 Longitudinal layer. Stratum longitudinale. Layer of longitudinally oriented muscle fibers distributed uniformly throughout the entire circumference of the rectum. C

19 Circular layer. Stratum circulare. Inner layer of circularly oriented muscle fibers of the tunica muscularis; no semilunar folds form in this part of the rectum. C

20 Internal anal sphincter. M. sphincter ani inter-nus. Thickened muscular ring of the circular layer at the anus, ca. 1-2 cm in height. C

Feneis, Pocket Atlas of Human Anatomy © 2000 Thieme

21 M. rectococcygeus. Thin plate of smooth muscle extending from the 2nd to 3rd coccygeal vertebrae to the rectum. C

22 M. rectourethralis. Smooth muscle fibers extending from the membranous part of the urethra to the rectum. C

23 Transverse rectal folds. Plicae transversae recti. Usually three lateral transverse folds. The middle is the largest (Kohlrausch) and projects about 6 mm above the anus from the right side, the others from the left. C

24 ANAL CANAL. Canalis analis. Terminal segment of the digestive tube beginning with the anal columns. D

25 Anal columns. Columnae anales. Six to ten longitudinal folds provided with abundant venous plexuses. D

26 Anal sinuses. Sinus anales. Recesses between the anal columns. D

27 Anal valves. Valvulae anales. Small transverse folds bordering the anal sinuses distally. D

28 Anorectal line. Linea anorectalis. Upper border ofanal canal formed bythe puborectal muscle at the level of the levator sling just above the anal columns. D

29 Anal pecten. [[Pecten analis]]. A lighter stripe between the anal valves and the anocutaneous line. It is firmly connected with the underlying tissues by fibrous longitudinal muscles. D

30 Anocutaneous line. [[ Linea anocutanea]]. Lower border of anal pecten at the level of the lower margin of the internal anal sphincter. D

31 External anal sphincter. M. sphincter ani exter-nus.Circularlayerofskeletalmusclelyingonthe internal anal sphincter. C D See p. 174.14-17

32 Anus. Lower opening of anal canal surrounded by the subcutaneous and superficial parts ofthe external anal sphincter. C D

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