W31/L11: Perineum Flashcards
What are the two triangles of the perineum made by a line between the ischial tuberosities?
Urogenital triangle
Anal triangle
What structure obscures the levator ani in the urogenital triangle from view?
The perineal membrane
What two regions are formed by the perineal membrane?
Superficial pouch
Deep pouch
The free posterior margin of the perineal membrane has a thickening in the midline - what’s it called?
The perineal body
What muscles reinforces the free posterior margin of the perineal membrane?
The transverse perineal muscles
How many transverse perineal muscles have we got?
4:
2 superficial and 2 deep
What are the spaces on either side of the anal canal in the anal triangle called?
Ischiorectal fossae
What’s in the ischiorectal fossae?
Fat & CT
What makes up the lateral wall of the ischiorectal fossae?
The lower part of OI
Where/what is the pudendal canal?
A split in the fascia overlying OI on the lower part that makes up the lateral wall of the ischiorectal fossae
What is the upper 2/3 of the anal canal lumen lined by?
Mucosa
What is the lower 1/3 of the anal canal lumen lined by?
Skin
What is the blood supply to the upper 2/3 of the anal canal?
Superior rectal artery of inferior mesenteric
What is the blood supply to the lower 1/3 of the anal canal?
Inferior rectal artery from the pudendal artery
What is the name of the line that delineates the two parts of the anal canal?
Pectinate line
