Anatomy of the small intestine

Description

Flashcards on Anatomy of the small intestine, created by Merike Mikkov on 07/10/2015.
Merike Mikkov
Flashcards by Merike Mikkov, updated more than 1 year ago
Merike Mikkov
Created by Merike Mikkov about 9 years ago
6
0

Resource summary

Question Answer
Where does the duodenum begin and end Begins: at the pyloric sphincter Ends: at the duodenojejunal flexure
How long are the different parts of the small intestine? Duodenum - 25 cm Jejunum - 2.5 m Ileum - 3.5 m
Define and describe the mesentery A fan-shaped fold of peritoneum that attaches jejunum and ileum to the posterior abdominal wall. Contains superior mesenteric vessels, lymph nodes, fat and autonomic nerves
Describe the blood supply to the jejunum and the ileum Superior mesenteric artery supplies the jejunum and ileum via jejunal and ileal arteries. SMA arises from the abdominal aorta at the level of L1. Sends 15-18 branches to the jejunum and ileum. These arteries unite to form arches called arterial arcades which give rise to straight arteries called vasa recta.
Describe the venous drainage of the jejunum and the ileum Superior mesenteric vein drains the jejunum and ileum. SMV ends posterior to the neck of the pancreas where it unites with the splenic vein to form the hepatic portal vein.
Describe the lymphatic drainage of the small intestine Specialised lymphatic vessels in the villi - lacteals. Absorb fat and empty the fluid into lymphatic plexuses in the walls of the jejunum and ileum which drain into lymphatic vessels in the mesentery. Within the mesentery the lymph passes through three groups of lymph nodes: • Juxta-intestinal lymph nodes (close to intestinal wall) • Mesenteric lymph nodes (among arterial arcades) • Superior central nodes (proximal part of the SMA) Lymphatic vessels from the terminal ileum follow the ileal branch of the ileocolic artery to the ileocolic lymph nodes.
Describe the nervous supply to the small intestine SMA and its branches are surrounded by a periarterial nerve plexus through which the nerves are conducted to the parts of the intestine supplied by this artery. Sympathetic fibres - T8-T10 segments to the superior mesenteric nerve plexus. Parasympathetic fibres in the nerves derive from the posterior vagal trunks.
Compare and contrast the appearance of jejunum and ileum
Name the characteristic lymphoid tissue prevalent in ileum Peyer's patches
Show full summary Hide full summary

Similar

The structure of the heart
rachel_w
4. The Skeletal System - bones of the skull
t.whittingham
Neuro anatomy
James Murdoch
The Circulatory System
mimtasin afra
Renal System A&P
Kirsty Jayne Buckley
The structure of the Heart, AS Biology
mill-bill
Respiratory anatomy
James Murdoch
Unit 4: The Respiratory and Circulatory Systems
Cath Warriner
1. Anatomy & Physiology of the Ear
t.whittingham
Respiration
Sarita Saha
Endocrine System Practice Essay Questions
Taneka Dunn