Abdominal anatomy Flashcards
divisions of the abdomen locations
mid clavicular line
subcostal line = L3
trans tubercular plane = L5
divisions of abdomen
hypochondrium -> epigastric -> hypochondrium
lumbar -> umbilical -> lumbar
iliac/inguinal -> pubic/hypogastric -> iliac/inguinal
surface anatomy of liver
in RUQ with left lobe racing LUQ
gallbladder lies in the transpyloric plane (L1) close to right lateral edge of rectus abdominus
surface anatomy of stomach
LUQ with pylori crossing midline
surface anatomy of caecum
RLQ
surface anatomy of descending colon
Left lumbar region
muscles of anterolateral abdominal wall
external oblique -> forms the inguinal ligament
deeper muscles are the internal oblique and transverses abdominus
layers of abdominal wall
parietal peritoneum deep fascia 3x muscles superficial fascia skin
muscles of anterior abdominal wall
rectus abdominus
contained in a sheath, join at midline, from costal margins to pubis
nerve supply of anterior abdominal wall
lateral cutaneous branches (T7-12) and anterior cutaneous branches
ilioinguinal and iliohypogastric nerves from L1, innervating lower abdominal muscles
entering the inguinal canal
testis/spermatic cord in makes and round ligament of the uterus in females pass through an out-pouching of transversus fascia through the deep inguinal ring and into the inguinal canal (inguinal canal connects abdomen and scrotum)
inguinal ligament/ canal position
ligament = between the pubic tubercle and the anterior superior iliac spine canal = between the mid inguinal point and above the pubic tubercle
inguinal hernia
indirect = tissue goes through deep ring -> superficial. occurs if the inguinal canal has not closed properly direct = abdominal contents push through weakness in abdominal wall, out of superficial ring
parts of posterior abdominal wall
diaphragm
psoas major, iliacus, quadratus lumborum
neurovascular plane in abdominal wall
above arcuate line
between the internal oblique and transversus abdominus, containing nerves and arteries
inferior anterior abdominal wall supplied by
inferior epigastric artery and deep circumflex iliac arteries
superior part of anterior abdominal wall supplied by
superior epigastric artery, branch of internal thoracic and branches from 10/11 intercostal
inferior part of abdominal wall drained by
3 superficial inguinal veins -> great saphenous
superior part of abdominal wall drained by
superficial epigastric vein and lateral thoracic
what is the peritoneum
thin, single layer of mesothelium that covers the internal surfaces of the abdominal wall (parietal) and the organs (visceral)
peritoneal cavity filled by
peritoneal fluid
lubricates the layers, allowing for movement of organs
function of peritoneum
support of viscera
fat storage
sealing off infected bowel segments
peritoneal ligaments + examples
double layers of peritoneal membrane falciform = liver -> ant. wall gastrophrenic = stomach -> diaphragm gastrosplenic = stomach -> spleen gastrocolic = part of greater omentum, stomach -> transverse Colin
what is mesentery
double layered flap of peritoneum
contains blood vessels, nerves, lymphatics, fat stores
what is the omentum
double layered segment of peritoneum that attaches the stomach to other organs
lesser = liver, stomach, duodenum
greater = large flap of tissue, stomach and duodenum to transverse colon
sacs created by greater and lesser omentum
lesser = behind stomach and lesser omentum greater = anterior cavity of abdomen
intraperitoneal organs
stomach first part of duodenum jejunum and ileum caecum and appendix transverse colon sigmoid colon liver and gall bladder tail of pancreas spleen
retroperitoneal
2,3,4 parts of duodenum ascending and descending colon head, neck, body of pancreas rectum and anus kidneys and ureters suprarenal gland aorta and IVC
foregut specifics
blood from coeliac trunk
sympathetic nerves T5-T9
inferior oesophagus to 2nd part of duodenum
midgut specifics
superior mesenteric artery
sympathetic nerves T10-11
midway along duodenum to 2/3 of transverse colon
hindgut specifics
inferior mesenteric artery
nerves T12-L1
from last 1/3 of transverse colon and rectum
space between layers of peritoneum
contains mesentery linkage = fat, blood vessels, nerves
maintains position of transverse, sigmoid colon and small intestine
reduces friction
protection