Spinal Rotation

Question 1

Internal oblique (origin)

Answer 1

thoracolumbar fascia, anterior 2/3 of iliac crest, lateral half of inguinal ligament

Question 2

Internal oblique (insertion)

Answer 2

inferior borders of ribs 10-12

Question 3

Internal oblique (action)

Answer 3

compresses and supports abdominal viscera, flexes and rotates trunk

Question 4

Internal oblique (innervation)

Answer 4

ventral rami & 1st lumbar nerve

Question 5

Internal oblique (blood supply)

Answer 5

superior/inferior epigastric arteries & deep iliac circumflex arteries

Question 6

External oblique (origin)

Answer 6

external surfaces of ribs 5-12

Question 7

External oblique (insertion)

Answer 7

linea alba, pubic tubercle, anterior 1/2 of iliac crest

Question 8

External oblique (action)

Answer 8

compresses and supports abdominal viscera, flexes and rotates trunk

Question 9

External oblique (innervation)

Answer 9

ventral rami

Question 10

External oblique (blood supply)

Answer 10

superior/inferior epigastric arteries

Question 11

Rotatores (origin)

Answer 11

transverse processes of lumbar region

Question 12

Rotatores (insertion)

Answer 12

lamina and transverse processes of spine above, spanning 1-2 segments

Question 13

Rotatores (action)

Answer 13

stabilizes, extends, and rotates the spine (stability is primary, extension and rotation are assistive)

Question 14

Rotatores (innervation)

Answer 14

dorsal rami

Question 15

Rotatores (blood supply)

Answer 15

dorsal branches of segmental arteries