I: Anterior Abdominal Wall Flashcards
What quadrant is the gall bladder located in?
epigastric
What quadrants might the appendix be located in?
mostly hypogastric
maybe umbilical or r. iliac
What is the vertebral level of the umbilicus?
L3-4
How does the abdominal wall function in respiration?
opposes diaphragm during exhalation
What is the adipose layer of the abdominal wall?
Camper’s fascia
the tough fibrous Scarpa’s fascia is deep to the camper’s fascia
What does scarpa’s fascia become in the scrotum? perineum?
scrotum -> dartos fascia
perineum -> colles fascia
Origin - external oblique
external surfaces of ribs 5-12
Insertion- external oblique
linea alba, pubic tubercle, anterior half of iliac crest
action- external oblique
compress and support abdominal viscera; flex and rotate trunk
Innervation- external oblique
thoraco-abdominal nerves (anterior rami of T7-T11) and subcostal nerves
Origin- internal oblique
thoracolumbar fascia, anterior 2/3 of iliac crest, and connective tissue deep to inguinal ligament
Insertion- internal oblique
inferior borders of ribs 10-12, linea alba and pubis via conjoin tendon
Action- internal oblique
compress and support abdominal viscera; flex and rotate trunk
Innervation- internal oblique
thoraco-abdominal nerves (anterior rami of T7-T11) and first lumbar nerve (L1)
How is the internal oblique different below and above the arcuate line?
above: tendons split and wrap anteriorly and posteriorly around the rectus abdominus
below: tendon fuses and wraps only anteriorly around the rectus abdominus
Origin- Transversus abdominus
internal surfaces of ribs 7-12 costal cartilages, thoracolumbar fascia, iliac crest, and connective tissue deep to the inguinal ligament
Insertion- transversus abdominus
linea alba with aponeurosis of internal oblique, pubic crest and pectin pubis via conjoin tendon
action- transversus abdominus
compresses and supports abdominal viscera
Innervation- transversus abdominus
thoraco-abdominal nerves (anterior rami of T7-T11) and first lumbar nerve (L1)
Origin- rectus abdominus
pubic symphysis and pubic crest
insertion- rectus abdominus
xiphoid process and costal cartilages 5-7
action- rectus abdominus
flexes trunk (lumbar vertebrae) and compresses abdominal viscera
- can acts as an antagonist to the diaphragm
- stabilizes and controls pelvic lift (antilordosis)
How is the rectus abdominus different above and below the arcuate line?
above: internal oblique fascia split contibuting to both anterior sheath fusing with external oblique aponeurosis and posteriorly fusing with transversus abdominus
below: all three aponeuroses pass anteriorly to the rectus and posterior wall is composed of only the transversalis fascia and parietal peritoneum (weaker area and prone to hernias)
What is the arcuate line?
horizontal line that demarcates the lower limit of the posterior layer of the rectus sheath
_________________: layer of fascia that lines the internal abdomial wall and forms the deep inguinal ring
transversalis fascia
__________________: serous lining of the peritoneum
parietal peritoneum
- produces a serous fluid that lubricates the abdominal organs