C1:S2 - Muscles of the Anterior Abdominal Wall Flashcards
What are the muscles of the anterior abdominal wall?
External Oblique Internal Oblique Transversus Abdominis Rectus Abdominis
What is the action of the external oblique?
Compress and Support abdominal viscera
Flex and rotate trunk
What is the innervation of the external oblique?
Anterior Rami of T7 to T12
What is the action of the internal oblique?
Compress and Support abdominal viscera
Flex and rotate trunk
Accessory resp muscle
Antagonist to diaphragm
What is the innervation of the internal oblique?
Anterior Rami of T7 to L1
What is the action of transversus abdominis?
Compress and support abdominal viscera
Thoracic and pelvic stability
Abdominal Movement
What is the innervation of transversus abdominis?
Anterior Rami of T7 to L1
What is the action of rectus abdominis?
Flex trunk
Compress viscera
Stabilise and control tilt of pelvis
What is the innervation of rectus abdominis?
Anterior Rami of T7 to T12
What is the difference in arrangement of the rectus sheath below and above the level of the umbilicus?
Above
External and 1/2 of the internal oblique aponeurosis run ANTERIOR to the rectus
The rest run posterior
Below
All aponeurosis lie anterior to rectus abdominis
What is the rectus sheath?
Aponeurosis of Ext Ob, Int Ob, and Trans Ab
Long fibrous sheath in centre of anterior abdominal wall
Which muscles are contained within the rectus sheath?
Recuts abdominis
Pyramidalis
At which vertebral level is the umbilicus
IV Disk L3 to L4
What can the umbilicus be used to identify and why is it a bad surface landmark?
Can be used to identify the bifurcation of the aorta
Bad surface landmark as its position is dependent on body fat levels
What thoracic spinal segments innervate the anterior abdominal wall?
T7 to T12
