Anal sinuses

Anal sinuses
Coronal section of rectum and anal canal
The interior of the anal canal and lower part of the rectum, showing the anal columns and the anal valves between their lower ends (the columns were more numerous in the specimen than usual)
Details
Identifiers
Latin	Sinus anales
TA98	A05.7.05.006
TA2	3013
FMA	76584
Anatomical terminology [edit on Wikidata]

An anal sinus (rectal sinus) is a furrow formed between any two adjacent anal columns of the anal canal. An anal sinus is limited inferiorly by an anal valve (which unites the inferior ends of a pair of adjacent anal columns). The anal glands open into the anal sinuses.^[1]

References

^ Sinnatamby, Chummy S. (2011). Last's Anatomy (12th ed.). p. 315. ISBN 978-0-7295-3752-0.

External links

Anatomy photo:43:11-0106 at the SUNY Downstate Medical Center — "The Female Pelvis: The Rectum"
pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University) (rectum)

Anatomy of the gastrointestinal tract, excluding the mouth

Upper

Pharynx	Muscles Spaces peripharyngeal retropharyngeal parapharyngeal retrovisceral danger prevertebral Pterygomandibular raphe Pharyngeal raphe Buccopharyngeal fascia Pharyngobasilar fascia Pyriform sinus
Esophagus	Sphincters upper lower glands crop
Stomach	Curvatures greater lesser Angular incisure Cardia Body Fundus Pylorus antrum canal sphincter Gastric mucosa Gastric folds Microanatomy Gastric pits Gastric glands Cardiac glands Fundic glands Pyloric glands Foveolar cells Parietal cells Gastric chief cells Enterochromaffin-like cells

Lower

Small intestine

Microanatomy	Intestinal villi Microvilli Intestinal glands Enterocytes Enteroendocrine cells Goblet cells Paneth cells
Duodenum	Suspensory muscle Major duodenal papilla Minor duodenal papilla Duodenojejunal flexure Brunner's glands
Jejunum	No substructures
Ileum	Ileocecal valve Peyer's patches Microfold cells

Large intestine

Cecum	Appendix
Colon	Ascending colon Hepatic flexure Transverse colon Splenic flexure Descending colon Sigmoid colon Continuous taenia coli haustra epiploic appendix
Rectum	Transverse folds Ampulla
Anal canal	Anus Anal columns Anal valves Anal sinuses Pectinate line Internal anal sphincter Intersphincteric groove External anal sphincter