branch of internal pudendal which is branch of IIA
rises in pudendal canal
entirely extrapelvic course
ligate in APR
dec supply to posterior commissure
point where the stratified squamous epithelium becomes true skin marked by the presence of hair follicles and sweat glands.
zone between the dentate line and the anal verge.
venous drainage of rectum
superior hemorrhoidal veins draining into the portal venous system (by way of the nferior mesenteric vein) and the middle and inferior hemorrhoidal veins draining into the caval system (by way of the internal iliac veins).
When contracted the puborectalis muscle creates a 90 degree angle between the anal canal and the rectum
relaxation allows the anorectal angle to approach 180 degrees allows defecation.