SCALENE MUSCLES

Question 1

ORIGIN and INNERVATION ANTERIOR SCALENES

Answer 1

origin ant. scalenes
O: TVPs C3-C6 (ANTERIOR TUBERCLES)
N: CERVICAL SPINAL NERVES (ventral rami C3-C6)

Question 2

INSERTION of ANTERIOR SCALENES

Answer 2

insertion ant. scalenes

I: 1st RIB (Scalene tubercle and cranial crest)

Question 3

ACTION of ANTERIOR SCALENES

Answer 3

action of ant. scalenes
A: FLEXION and LAT. FLEXION of NECK;
ELEVATION of 1st RIB; contralateral rotation (weak)

Question 4

ORIGIN and INNERVATION MIDDLE SCALENES

Answer 4

origin middle scalenes
O: TVPs C2-C7 (POSTERIOR TUBERCLES)
N: CERVICAL SPINAL NERVES (vent. rami C3-C8)

Question 5

INSERTION of MIDDLE SCALENES

Answer 5

insertion middle scalenes

I: 1st RIB (behind Anterior Scalene)

Question 6

ACTION of MIDDLE SCALENES

Answer 6

action of middle scalenes
A: FLEXION and LAT. FLEXION of NECK;
ELEVATION of 1st RIB

Question 7

ORIGIN and INNERVATION POST. SCALENES

Answer 7

origin posterior scalenes
O: TVPs of C5-C7 (POSTERIOR TUBERCLES)
N: CERVICAL SPINAL NERVES (C6-C8)

Question 8

INSERTION of POSTERIOR SCALENES

Answer 8

insertion of posterior scalenes

I: 2nd RIB (OUTER SURFACE)

Question 9

ACTION of POSTERIOR SCALENES

Answer 9

action post. scalenes

A: LATERAL FLEXION of NECK; ELEVATION 2nd RIB