posterior triangle of the neck

Question 1

what muscle divides posterior triangle into the occipital triangle and the supra-clavicular triangle ?

Answer 1

inferior belly of omohyoid

Question 2

what are the muscles found in the floor of the posterior triangle ?

Answer 2

scalenus medius
levator scapulae
splenius capitis
semi-spinalis captis

Question 3

what are the nerves present in the posterior triangle of the neck ?

Answer 3

3 trunks of brachial plexus ( group of nerves that supply upper limbs )

4 cutaneous branches of cervical plexus

spinal accessory :supplies sternocliedomastoid + trapezius

Question 4

what are the important arteries present in the posterior triangle ?

Answer 4

3rd part of the subclavian artery

Question 5

what are the important veins present in the posterior triangle ?

Answer 5

subclavian vein

external jugular vein

Question 6

what nerve supplies the angle of the mandible ?

Answer 6

greater auricular nerve

Question 7

what is the insertion and origin of the sternocliedomastoid ?

Answer 7

lateral surface of the mastoid process and lateral 1/2 of the superior nuchal line

Question 8

what nerve supplies the sternocliedomastoid and the trapezius ?

Answer 8

spinal accessory nerve