Unit 1 - Back: Posterior Cervical Triangle (Ex. I)

Question 1

anterior border

Answer 1

P sternocleidomastoid

Question 2

posterior border

Answer 2

A trapezius

Question 3

inferior border

Answer 3

clavicle

Question 4

roof

Answer 4

investing fascia - encases sternocleidomastoid and trapezius

Question 5

floor

Answer 5

splenius capitis
levator scapulae
middle scalene
omohyoid (inferomedial)

Question 6

contents

Answer 6

cervical plexus - cutaneous branches from A rami of C1-C4:
lesser occipital N (C2)
great auricular N (C2-C3) ==> ear
transverse cervical N (C2-C3) ==> across neck anteriorly
supraclavicular N (C3-C4)
spinal accessory N (CN XI)
external jugular vein ==> dumps into subclavicular v.
roots of brachial plexus –> dorsal scapular N (C5, sometimes C4)
phrenic N (C3-C5)