Covers the rectum from its start at the sigmoid colon around the S3 vertebra to its end below the coccyx, where it becomes the anal canal. It describes the lack of colonic wall features, the length, and the surrounding structures in males and females. The note also sets out the rectal flexures, the peritoneal coverage of its three parts, and the arterial, venous, nerve and lymphatic supply, with a table of the blood vessels and several labelled diagrams.
Topic 13 of 44 in the MU Sofia syllabus for Anatomy (Internal Organs+Glands) (Medicine, Years 1 and 2). The free AceMed note covers it in 6 sections, about 209 words (2 min of reading), with 10 flashcards.
In this note
RECTUM
Muscles:
Syntopy:
Rectal flexure:
Peritoneum of the rectum
Supply
RECTUM
Begins as a continuation of the sigmoid colon (at S3 vertebra) and ends one inch bellow the coccyx (as it gives the anal canal)
* Its lack of feature of the wall of large intestine (haustra, taenia coli and omental appendices)
Length 12 - 15 cm.
Syntopy:
Dorsally, in both sexes: sacral vertebrae III–V, coccyx
Laterally, in both sexes: pararectal fossae, levator ani
Ventrally, in male:
oral part: urinary bladder, seminal glands, rectovesical excavation of Proust
