QuestionSBA
QuestionChoice
This describes the blood supply of the rectus abdominis muscle which is a key part of the anterior abdominal wall. The quadratus lumborum is a muscle of the posterior abdominal wall. It receives its blood supply from the paired subcostal arteries, lumbar and iliolumbar arteries.
10009343
d
It receives its blood supply from the superior and inferior epigastric arteries
QuestionChoice
This describes the psoas major muscle. The quadratus lumborum originates from the iliac crest and iliolumbar ligament and inserts onto the inferior border of the 12th rib.
10009342
c
It originates from the transverse processes and vertebral bodies of T12-L5 and inserts onto the lesser trochanter of the femur
QuestionChoice
Although it is mainly the external intercostal muscles and the diaphragm that contract to elevate the rib during inspiration, the quadratus lumborum has an important role in stabilisation of the 12th rib on both sides so that the diaphragm contracts efficiently.
10009340
a
It is important as it fixes the 12th rib during inspiration
QuestionChoice
Whilst the quadratus lumborum is important for lateral flexion of the trunk, it also plays a role in extension of the trunk. Additionally it is the psoas minor which is only found in some and therefore provides weak flexion of the trunk.
10009344
e
It is found in only 40% of the population and is important for lateral flexion of the trunk
QuestionChoice
This describes the innervation to the diaphragm. The quadratus lumborum receives its innervation from the anterior rami of the T12 and L1-L4 muscles.
10009341
b
It receives its innervation from the phrenic nerve which arises from C3-C5
Concept
Chapter
2693
5336
Posterior abdominal wall muscles
Topic
197
Abdominal anatomy
14416
Picture
1775
118 - Posterior Abdominal Wall Muscles (right quadratus lumborum).png
images/rj5i8inx1682953228910.jpg
images/rj5i8inx1682953228910_256.jpg
images/rj5i8inx1682953228910_512.jpg
KTkOHQT3yXp4d4ind4d4lwaGaGB4
Topic
197
Abdominal anatomy
Which of the following is true about the muscle to which the arrow is pointing to?

[lightgallery]
a