University:
Camosun College
Course:
BIOL 252 | Pathophysiology for Nursing 1
Academic year:

2024
Views:

471

Pages:

5
Author:

Aysha A.

Muscasal Folds: The muscosal Mucous membrane of an employ rectum sho two types of folds - longitudinal I transvers -The longitudinal folds are transitory. They are present in the louce part of an empty rediom, and are obliterated by distension - The transverse horizontal folds. Houston's values plicae transversals are permanent and most marked when the rectum is distended a) First transverse fold lies near the upper end of the rectum and projects from the left wall situater 7.5m aboue anus; sometimes it may encicle and partially constrid the lumen (b) second transverse fold largest and most constant, lies at the upper end of the retal ampulla, and project from the anterice and right wah c) Therd transverse fold. Which is inconstant lies. 2.3 pm the left wall. wed fold. The theed and projects Functional Parts of the Rectum - has two developed mental part -The upper part related to the peritoneum develops from the hindgut and lies above the third transverse fold of the reclaim - dover part devoid of peritoneum develops from the cloaca and lies below the third transverse fold. -Functionally, the sigmoid colon is the faecal deserter and whole of the rectum is empty in normal. individuals hing sensitive to dispensing Arterial supply: 1) superior rectal artery: -chief artery of the rectum -Continuation of the inferior mesenteric artery of the elbow luim, medial to the ureter - Lies in the medial limle of pelure mesocolon and divides opposite the third sacral vertebra into height and left branches.. 2) Middle rectal arteries: supply only the superficial coats of the lower rectum - Aruri from the enteric divison of the internal i'leac artery, run in the lateral ligaments of rectum 3) Median sacral artery: - small branch arising from the back of the aorta - descends in median plane and supples the posterich wall of anoxectal junction. Venous drainage! 1) Superior tectal vein - Tributaries of this vein begin in the anal canal, fran the internal rectal venous plexus in the form of about three veurs of considerable siz They pars upwards in the rectal subclass, pierce the mucular coat about 7.5cm above the ances 2) Middle rectal veun -The tributaries of this vin drain, chiefly, the musculon walls of the rectal ampulla and open inte the internal crac ven 3) Median sacral vein - It joins left common iliac vein unga abrit * Lymphatic Drainage lymphatics from more than the apper half of the coctum pars along the superior rectal vessels to the infers a mesentery moder 2) Lymphaties from the leuce half of the rectum pars along the middle rectal vessels ciliac nocles, to the internal