Muscles of the Thorax and Abdomen: Muscles of the Abdominal Wall

Question 1

Rectus Abdominis Proximal Attachment

Answer 1

Pubic crest and symphysis

Question 2

Rectus Abdominis Distal Attachment

Answer 2

Costal cartilages of ribs 5-7 and xiphoid process

Question 3

Rectus Abdominis Innervation

Answer 3

Intercostal nerves T7-T12

Question 4

Rectus Abdominis Action

Answer 4

Flexes the vertebral column

Question 5

External Oblique Proximal Attachment

Answer 5

Lower 8 ribs

Question 6

External Oblique Distal Attachment

Answer 6

Abdominal aponeurosis to linea alba, pubic tubercle, and anterior half of the iliac crest

Question 7

External Oblique Innervation

Answer 7

Intercostal nerves T7-T12, iliohypogastric and ilioinguinal nerves

Question 8

External Oblique Action

Answer 8

Unilaterally:
Laterally flexes the vertebral column
Rotates the vertebral column to the opposite side
Bilaterally:
Flexes the vertebral column

Question 9

Internal Oblique Proximal Attachment

Answer 9

Thoracolumbar fascia, iliac crest, and inguinal ligament

Question 10

Internal Oblique Distal Attachment

Answer 10

Lower 3 or 4 ribs, abdominal aponeurosis to linea alba, and pubic crest

Question 11

Internal Oblique Innervation

Answer 11

Intercostal nerves T7-T12, iliohypogastric and ilioinguinal nerves

Question 12

Internal Oblique Action

Answer 12

Unilaterally:
Laterally flexes the vertebral column
Rotates the vertebral column to the same side
Bilaterally:
Flexes the vertebral column

Question 13

Transversus Abdominis Proximal Attachment

Answer 13

Lower 6 ribs, thoracolumbar fascia, iliac crest, and inguinal ligament

Question 14

Transversus Abdominis Distal Attachment

Answer 14

Abdominal aponeurosis to linea alba and pubic crest

Question 15

Transversus Abdominis Innervation

Answer 15

Intercostal nerves T7-T12, iliohypogastric and ilioinguinal nerves

Question 16

Transversus Abdominis Action

Answer 16

Flattens the abdominal wall

Compresses the abdominal viscera

Question 17

Quadratus Lumborum Proximal Attachment

Answer 17

Posterior iliac crest

Question 18

Quadratus Lumborum Distal Attachment

Answer 18

Rib 12 and transverse processes of L1-L4

Question 19

Quadratus Lumborum Innervation

Answer 19

Anterior rami of spinal nerves T12-L3

Question 20

Quadratus Lumborum Action

Answer 20

Unilaterally:
Laterally flexes the trunk
Elevates the pelvis
Bilaterally:
Extends the trunk
Stabilizes the lumbar spine

Question 21

Psoas Major Proximal Attachment

Answer 21

Transverse processes, intervertebral discs, and adjacent bodies of T12-L5

Question 22

Psoas Major Distal Attachment

Answer 22

Lesser trochanter of the femur

Question 23

Psoas Major Innervation

Answer 23

Femoral n. [L1,L2,L3]

Question 24

Psoas Major Action

Answer 24

Flexes the hip
Assists with:
-Hip lateral rotation
-Lumbar side flexion
Lumbar stabilization
-Anterior pelvic tilt

Question 25

Iliacus Proximal Attachment

Answer 25

Iliac fossa and anterior ligaments of the lumbosacral and sacroiliac joints

Question 26

Iliacus Distal Attachment

Answer 26

Lesser trochanter of the femur

Question 27

Iliacus Innervation

Answer 27

Femoral n. [L1,L2,L3]

Question 28

Iliacus Action

Answer 28

Flexes the hip
Assists with:
-Hip lateral rotation
-Anterior pelvic tilt