L3: posterior triangle + L4: suboccipital triangle

Question 1

what are the 2 divisions of the posterior triangle ?

Answer 1

supra-clavicular triangle and occipital triangle

subdivided by omohyoid

Question 2

what are the floor muscles of the posterior triangle ?

Answer 2

scalenus medius
levator scapulae
splenius capitis
semispinalis capitis

(all covered by prevertebral fascia)

Question 3

what nerves are in the posterior triangle ?

Answer 3

3 trunks of brachial plexus
4 branches of cervical plexus
spinal accessory nerve

Question 4

what are the arteries present in the posterior triangle ?

Answer 4

3rd part of occipital and subclavian arteries

Question 5

what are the veins present in the posterior triangle ?>

Answer 5

subclavian vein

external jugular vein

Question 6

injury of the spinal accessory nerve leads to ____

Answer 6

paralysis of trapezius and sternocleidomastoid .the face is turned to the paralyzed side by the normal sternocliedomastoid

Question 7

what is the insertion of the sternocliedomastoid ?

Answer 7

Lateral surface of the mastoid process.

The lateral 1/2 of the superior nuchal line

Question 8

spasm of muscles in the neck lead to a condition called ___

Answer 8

torticollis (spastic neck

Question 9

what are the boundries of the sub-occipital triangle ?

Answer 9

supero-medially: rectus capitis posterior minor and rectus capitis posterior major

supero-laterally: superior oblique

inferiorly : inferior oblique

Question 10

what are the contents of the sub-occipital triangle ?

Answer 10

dorsal rami to c1 nerve

suboccipital venous plexus

3rd part of vertebral artery