Posterior Cervical Triangles

Question 1

Sternocleidomastoid O

Answer 1

Sternal head: anterior surface of manubrium of sternum

Clavicular Head: superior surface of medial third of clavicle

Question 2

Sternocleidomastoid I

Answer 2

lateral surface of mastoid process of temporal bone

lateral half of superior nuchal line

Question 3

Sternocleidomastoid Innervation

Answer 3

Spinal accessory nerve CN XI and C2 C3

Question 4

Sternocleidomastoid Motion

Answer 4

unilateral: tilt head same side (laterally flexes neck) and rotates it so face is turned superiorly towrad the opposite side

bilateral: extend neck at atlantooccipital joint
flex cervical vertebrae so that chin approaches manubirum
extend superior cervical vertebrae while flexing inferior vertebrae so chin is thrust forward with head kept level

Question 5

Anterior Scalene O

Answer 5

Anterior tubercles of transverse processes of C3 - C6 vertebrae

Question 6

Anterior Scalene I

Answer 6

**1st rib (anterior scalne tubercle)

Question 7

Anterior Scalene Innervation

Answer 7

Cervical spinal nerves C4 - C6

Question 8

Anterior Scalene Motion

Answer 8

flexes neck laterally

Elevates first rib during forced inspiration

Question 9

Middle Scalene O

Answer 9

Posterior tubercles of transverse processes of C4 - C7 vertebrae

Question 10

Middle Scalene I

Answer 10

Superior surface of 1st rib (posterior to groove for subclavian A.)

Question 11

Middle Scalene Innervation

Answer 11

Anterior rami of cervical spinal nerves

Question 12

Middle Scalene Motion

Answer 12

flexes neck laterally

Elevates first rib during forced inspiration

Question 13

Posterior Scalene O

Answer 13

Posterior tubercles of transverse processes of C4 - C6 vertebrae

Question 14

Posterior Scalene I

Answer 14

External border of second rib

Question 15

Posterior Scalene Innervation

Answer 15

Anterior rami of cervical spinal nerves C7 - C8

Question 16

Posterior Scalene Motion

Answer 16

flexes neck laterally

Elevates second rib during forced inspiration