The Viscera Flashcards
External oblique origin
Lower eight ribs
External oblique insertions
The iliac crest, pubic tubercle and pubic crest
Internal oblique origins
Lumbar sacia, iliac crest and the lateral two thirds of the inguinal ligament
Transversus abdominis origins
Inner surfaces of lower six ribs, lumbar fascia, iliac crest and lateral third of inguinal ligament
Transversus abdominis insertions
Linea alba via aponeurosis which contributes to posterior wall of rectus sheath
Rectus abdominis origins
From pubic symphysis and the pubic crest
Rectus abdominis insertions
5th, 6th and 7th costal cartilages
Transversus fascia
Layer of fascia deep to the transverses abdomens, separating from the parietal peritoneum and exztraperitoneal fat
Abdominal muscle innveration
segmentally innervated by spinal nerves T7 to L1
Lie between internal oblique and the transverses abdominis
T7
Just below xiphisternum
L1
Suprapubic region
T10
Umbilicus
Parietal peritoneum
Lining the walls
Visceral peritoneum
Covering the viscera
Intraperitoneal
Organs suspended in the peritoneal cavity
Peritoneal cavity
Continuous lining of abdominal walls by parietal peritoneum forming a sac
Retroperitoneal
Organs outside peritoneal cavity, with only one surface or part of one surface covered by peritoneum
SADPUCKER
Suprarenal glands, aorta/IVC, Duodenum, Pancreas, ureters, Colon, Kidneys, oEsophagus and Rectum
Greater omentum
Derived from dorsal mesentary
Two layers
Peritoneal fold attaches to greater curvature of the stomach and first part of duodenum
Drapes inferiorly over transverse colon, jejunum and ileum
Ascends to the peritoneum on superior surface of the transverse colon and anterior layer of transverse mesocolon
Before arriving at posterior abdominal wall
Small intestine
Major site of digestion and absorption
2-7m long
Extends from the pylorus to the oleo-caecal junction
Duodenum
C-shaped
Curves around head of pancreas
Retroperitoneal
Divided into 4 parts
Jejunum
Lining more tightly folded into plicate circulares
Only 1 or 2 arcades
Appears pinker due to richer blood supply
Ileum
More mesenteric fat Narrower lumen Prominent Peyer's patches More arcades (3,4, or more) Shorter vase rectae Thinner walls with less pilcae circularis
Meckel’s Diverticulum
Found 10cm from end of ileum
Remnant of vitelline duct
2-5% of population
mimics symptoms of appendicitis if inflamed
Blood supply of small intestine
Superior mesenteric artery, branch of abdominal aorta
Enters mesentery as it crosses 3rd part of duodenum
Large intestine
Begins at oleo-caecal valve in the right iliac fossa
Ascending and descending colon are retroperitoneal
Caecum
Dilating blind ending commencement of large intestine
Located in iliac fosa
Appendix
Attached to posteromedial surface of the caecum
Essentially useless
Ascending colon
Retroperitoneal
Ascends towards liver, where it turns left to become the hepatic flexure
Transverse colon
Intraperitoneal
Extends from hepatic flexure to splenic flexure
Descending colon
Retroperitoneal
Lies on posterior abdominal wall muscles and closely related to left ureter
Sigmoid colon
Intraperitoneal
Extends from pelvis brim to rectosigmoid junction
S-shaped