posterior triangle of neck

Question 1

what is the posterior triangle developed from

Answer 1

2nd pharyngeal arch

Question 2

what are the boundaries of the posterior triangle - anterior, posterior, inferior

Answer 2

anterior posterior border of SCM
posterior - nateiro border of trapezius muscle
inferior middle 1/3 of clavicle

Question 3

name other notable vessels and nerves in the posterior trinagle

Answer 3

external carotid artery, subclavian vein, accessory nerve, phrenic nerve (part of cervical plexus), brachial plexus

Question 4

what does the great auricular nerve originate and innervate

Answer 4

originates from cervical plexus and provides innervation for the skin over the parted gland and mastoid process (angle of mandible and outer ear)

Question 5

what does the transverse cervical nerve innervate

Answer 5

anterior and lateral parts of the skin of the neck

Question 6

what does the ansa cericallis innervate

Answer 6

innervates the infrahyoid muscles bar the thyrohyoid muscle

Question 7

what does the accessory nerve innervate in the posterior triangle of the neck and how to test if damaged

Answer 7

trapezius muscle - id patient cant shrug shoulder or stick out shoulder blade = damage to accessory nerve

Question 8

where does the SCM originate from and where does it insert

Answer 8

in originates from the mastoid process and inserts via two head in the calcivle and manubrium of the sternum