Lateral/Posterior Cervical Muscles

Question 1

Insertion of descending trapezius?

Answer 1

Clavicle (lateral one third)

Question 2

Innervation of descending trapezius?

Answer 2

Motor: accessory n. (CN XI)

Pain and proprioception: cervical plexus (C2, C3

Question 3

Action of the descending trapezius?

Answer 3

Draws scapula obliquely upward, rotates glenoid cavity superiorly

Question 4

Origin of Sternal head of sternocleidomastoid?

Answer 4

Sternum (manubrium)

Question 5

Origin of clavicular head of sternocleidomastoid?

Answer 5

Clavicle (medial one third)

Question 6

Insertion of sternocleidomastoid?

Answer 6

Temporal bone (mastoid process), occipital bone (superior nuchal line)

Question 7

Innervation of sternocleidomastoid?

Answer 7

Motor: accessory n. (CN XI)

Pain & Proprioception: cervical plexus, (C2-C3)

Question 8

Action of sternocleidomastoid? (bilateral + unilateral)

Answer 8

Bilateral: extends head, aids in respiration when head is fixed

Unilateral: Tilts head to same side, rotates head to opposite side

Question 9

Origin of anterior scalene?

Answer 9

C3-C6 (anterior tubercles of transverse processes)

Question 10

Insertion of anterior scalene?

Answer 10

1st rib (scale tubercle)

Question 11

Origin of middle scalene muscles?

Answer 11

C1-C2 (transverse processes), C3-C7 (posterior tubercles of transverse processes)

Question 12

Insertion of middle scalene muscle?

Answer 12

1st rib (posterior to groove for subclavian artery)

Question 13

Origin of posterior scalene muscle?

Answer 13

C5-C7 (posterior tubercles of transverse process)

Question 14

Insertion of posterior scalene muscle?

Answer 14

2nd rib (outer surface)

Question 15

Innervation of scalene muscles?

Answer 15

Direct branches from cervical and brachial plexuses (C3-C8)

Question 16

Action of scalene muscles?

Answer 16

With ribs mobile: elevates upper ribs (during forced inspiration)

With ribs fixed: Unilateral: bends cervical spine to same side
Bilateral: flexes neck

Question 17

Origin of the descending trapezius?

Answer 17

Occipital bone, spinous processes C1-C7