Posterior Abdominal Wall

Question 1

Quadratus Lumborum Main Actions

Answer 1

Unilaterally:
- Laterally tilt/hike/elevate pelvis
- Laterally flex the vertebral column to the same side

Bilaterally
- Fix the last rib during forced inspiration

Question 2

Quadratus Lumborum Superior Attachment

Answer 2

12th ribs and tips of lumber TP

Question 3

Quadratus Lumborum Inferior Attachment

Answer 3

Iliolumbar ligament and iliac crest

Question 4

Quadratus Lumborum Nerve Innervation

Answer 4

Ventral branches of T12, L1-L4

Question 5

Psoas Major Main Actions

Answer 5

Acting inferiorly w/Iliacus, flex hip

Acting superiorly, flexes the vertebral column laterally, balances trunk

When sitting, acts inferiorly w/ iliacus to flex trunk

Question 6

Psoas Major Superior Attachment

Answer 6

TP of T12-L5 vertebrae, sides of L bodies, and discs between them

Question 7

Psoas Major Inferior Attachment

Answer 7

Lesser Trochanter

Question 8

Psoas Major Nerve Innervation

Answer 8

Ventral Rami of L1-L3

Question 9

Iliacus Main Actions

Answer 9

Flexes thigh and stabilizes hip joint; acts w/ psoas major

Question 10

Iliacus Superior Attachment

Answer 10

Iliac fossa, sacrum, and anterior sacroiliac ligaments

Question 11

Iliacus Inferior Attachment

Answer 11

Lesser trochanter and psoas tendon

Question 12

Iliacus Nerve Innervation

Answer 12

Femoral L2 to L4

Question 13

Rectus Abdominis Main Actions

Answer 13

Flex the Vertebral column
Compress abdominal Viscera
Tilt pelvis posteriorly (antilordosis)

Question 14

Rectus Abdominis Origin

Answer 14

Pubic crest and pubic symphysis

Question 15

Rectus Abdominis Insertion

Answer 15

Cartilage of 5-7 ribs and xiphoid process

Question 16

Rectus Abdominis Nerve Innervation

Answer 16

Thoraco-abdominal nerves (anterior rami of T6-T12 spinal nerves)

Question 17

External Oblique Main Actions

Answer 17

Unilaterally:
- Laterally flex the vertebral column to the same side
- Rotate the vertebral column to the opposite side

Bilaterally:
- Flex the vertebral column
- Compress abdominal contents

Question 18

External Oblique Origin

Answer 18

External surface of 5-12 ribs

Question 19

External Oblique Insertion

Answer 19

Linea alba, pubic tubercle, and anterior half of iliac crest

Question 20

External Oblique Nerve Innervation

Answer 20

Thoraco-abdominal nerves of T7-T11 and subcostal n

Question 21

Internal Oblique Main Actions

Answer 21

Unilaterally:
- Laterally flex the vertebral column to the same side
- Rotate the vertebral column to the ipsilateral side

Bilaterally:
- Flex the vertebral column
- Compress abdominal contents

Question 22

Internal Oblique Origin

Answer 22

Thoracolumbar fascia, iliac crest, and inguinal ligament