Flashcards in Posterior Abdominal Muscles Deck (19)
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1
Which muscle is said to form the iliolumbar ligament?
quadratus lumborum
2
What osseous part of the vertebral column serves as an origin to the quadratus lumborum?
transverse process of L5
3
What non-vertebral column site serves as an origin to the quadratus lumborum?
iliac crest of the innominate bone
4
What is the insertion of the quadratus lumborum?
transverse tubercle of the transverse process of L1-L4 and 12th rib
5
Contraction of the quadratus lumborum will result in what movements?
- steadies the origin of the diaphragm
- when pelvis is fixed, it will laterally flex the lumbar spine
- bilaterally acts to extend the lumbar spine
- stabilizes and depresses the 12th rib
6
What will innervate the quadratus lumborum?
ventral rami of T12 and L1-L3 or L4 spinal nerves
7
What is the origin of the psoas major?
vertebral bodies of T12, L1-L5, S1 and transverse processes of L1-L5
8
What is the insertion of the psoas major?
lesser trochanter of the femur
9
Contraction of the psoas major will result in what movements?
- flex the thigh at the hip when the spine is stabilized
- flex trunk and tilt pelvis forward when thigh is stabilized
- important in raising body from supine to sitting positions
10
What will innervate the psoas major?
primarily the ventral rami of L2 and L3, may include ventral rami of L1 and L4 spinal nerves
11
What is the origin of the psoas minor?
vertebral bodies of T12 and L1
12
What is the insertion of the psoas minor?
iliopubic eminence of the innominate bone
13
Contraction of the psoas minor will result in what movements?
weakly flexes the trunk
14
What will innervate the psoas minor?
ventral ramus of L1 spinal nerve
15
What osseous part of the vertebral column serves as an origin to the iliacus?
superolateral margin of sacrum
16
What non-vertebral column site serves as an origin to the iliacus?
- iliac crest
- upper 2/3 of the iliac fossa of the innominate bone
17
What is the insertion of the iliacus?
lesser trochanter of femur
18
Contraction of the iliacus will result in what movements?
- flex the thigh at the hip when the spine is stabilized
- flex the trunk and tilt pelvis forward when thigh is stabilized
- important in raising body from supine to standing positions
19
