Anterior abdominal wall Flashcards
Superior and inferior boundaries of the anterolateral abdo wall
superior - cartilages of 7th-10th ribs and xiphoid process
inferior - inguinal ligament and pelvic bones
layers of the antlat abdo wall
superficial to deep
skin camper fascia scarpa fascia EO IO TA transversalis fascia extraperitoneal fat parietal peritoneum
arcuate line
lower limit of the posterior layer of the rectus sheath where inf epigastric vessels perforate the rectus abdominis
1/3 of the distance from umbilicus to pubic crest
describe the aponeuroses of the muscles above and below the arcuate line
above - ant layer of rectus sheath formed by EO aponeurosis and ant lamina of IO aponeurosis. Posterior layer formed by post lamina of the IO aponeurosis and TA aponeurosis
below - aponeuroses of EO, IO and TA pass ant to rectus abdominis to form the ant rectus sheath. Transversalis fascia covers the RA posteriorly
Contents of the rectus sheath
Rectus abdominis
pyramidalis
sup and inf epigastric arteries and veins
lymph vessels
thoraco-abdominal and subcostal nerves (distal portions of ant rami of spinal nerves T7-12)
where does the linea alba stretch to and from?
xiphoid process to pubic symphysis
what vertebral level is the iliac crest?
L4
what do the semilunar lines demarcate?
lateral borders of the rectus abdominis and rectus sheath
where do the semilunar lines go to and from?
from inferior costal margin near cc9 to pubic tubercle
contents of the femoral canal
lymph vessels, draining the deep lymph nodes
deep lymph node - lacunar node
empty space
loose connective tissue
what is a femoral hernia
protrusion of small intestine through the femoral ring into the femoral canal
how does a femoral hernia present
as a lump inferolateral to the pubic tubercle
can enlarge by passing through the saphenous opening
where is the inguinal canal
between the deep and superficial inguinal rings, superior and parallel to the inguinal ligament
how do the walls of the inguinal canal prevent herniation (which muscles are involved?)
contraction of the EO brings ant wall towards post wall
contraction of the IO and transversus abdominis cause the roof to descend
posterior part is transversalis fascia
where is the deep inguinal ring found?
lateral to the epigastric vessels, above midpoint of inguinal ligament
evagination of transversalis fascia