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Anal sinuses

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Anal sinuses
Coronal section of rectum and anal canal.
The interior of the anal cami and lower part of the rectum, showing the columns of Morgagni and the anal valves between their lower ends. The columns were more numerous in the specimen than usual.
Latin sinus anales
Gray's subject #249 1185
Dorlands/Elsevier s_12/12738546

The rectal columns are separated from one another by furrows, or rectal sinuses, which end below in small valve-like folds, termed anal valves.

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

Gastrointestinal tract

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Upper gastrointestinal tract

Mouth | Pharynx (nasopharynx, oropharynx, hypopharynx) | Esophagus | Crop | Stomach (rugae, gastric pits, cardia, pylorus)

Lower gastrointestinal tract

Small intestine (duodenum, jejunum, ileum) | Vermiform appendix

Large intestine: Cecum | Colon (ascending colon, transverse colon, descending colon, sigmoid colon) | Rectum (Houston valve, rectal ampulla, pectinate line) | Anal canal (anal valves, anal sinuses, anal columns)

Anus: Sphincter ani internus muscle | Sphincter ani externus muscle

Enteric nervous system: Meissner's plexus | Auerbach's plexus

Enteroendocrine cells: G cells | Enterochromaffin cells | Enterochromaffin-like cell

GALT: Peyer's patches | M cells

parietal cells | chief cells | goblet cells | Brunner's glands | Paneth cells | enterocytes

intestinal villus/microvillus | crypts of Lieberkühn | circular folds | taenia coli | haustra | epiploic appendix

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