Lecture 15 Anterior Abdominal Wall Flashcards
What is the most superficial layer of fascia in the anterior abdominal wall?
- camper’s fascia (fatty SF)
What is the deep layer of the superficial fascia?
- scarpa’s fascia (membranous SF)
- (compact and tightly arranged thin membrane)
Where is subcutaneous fat stored?
camper’s fascia
What does parietal peritoneum do?
- deepest layer of body wall
- secretes lubricant so abdominal viscera have frictional environment
What are abdominal wall layers
innervated by?
- somatic sensory innervation
What is the deepest of the muscle layers of the anterior abdominal wall?
- transversus abdominis muscle
Where does the rectus abdominis originate?
- pubis
Where does the rectus abdominis insert?
- costal cartilages and xiphoid processes
Where does the rectus sheath not have a posterior wall?
- lower 1/3
- at arcuate line
Which layer of abdominnal wall muscle is indecisive with its rectus sheath.
- internal abdominal oblique
Which abdominal wall muscle is fan shaped?
- internal abdominal oblique
Which abdominal muscle has fibers that run the same way as intercostal muscles?
- external abdominal oblique
Does the tranversus abdominis originate from the inguinal ligament?
- no it wraps around to the transversalis fascia
What contributes to the motor innervation of the abdominal wall muscles?
- T7-11
- T12
- L1
What innervates the skin that covers the anterior abdominal wall?
- the ventral rami of the lower 5 intercostal nerves
- T7-11
- subcostal nerve T12
- L1 nerves
Lateral blood supply of anterior abdominal wall
- intercostal arteries
- these arteries run between internal oblique muscles and transversus abdominus muscle
Where does the rectus abdominus gets it primary blood supply?
- superior epigastric artery (in upper) (runs on deep surface of rectus abdominus)
- ## inferior gastric artery (majority of blood supply)
Where does the inferior epigastric artery enter?
- underneath the rectus sheath running along the transverse fascia
Where does the lymph from above the umbilicus drain?
- to axillary nodes
Where does the lymph from below the umbilicus drain?
- to superficial inguinal nodes
What happens when abdominal wall muscle act bilaterally?
- flexion
What happens when abdominal wall muscle act unilaterally?
- lateral flexion
What happens when abdominal wall muscle act unilaterally?
- rotation or twisting
Less obvious functions of abdominal wall muscles
- stabilization of the trunk during strenuous physical effort (valsalvas maneuver)
- forceful expiration
- coughing and sneezing
- urination and defecation
- labor and delivery
