cervical plx

Question 1

cervical plx

Answer 1

anterior rami of cervical nerves C1-C4
- muscular br + cutaneous br

Question 2

branches

Answer 2

cutaneous sensory branches:
1) lesser occipital N
2) greater auricular N
3) transverse N of neck (transverse cervical)
4) supraclavicular Nerves (medial, intermediate and lateral)

motor branches:
1) inferior root of ansa cervicalis
2) phrenic N
3) muscular branches (for prevertebral + lateral v.bral mm)

Question 3

phrenic n

Answer 3

mest motor fibers for diaphragm
-sensory fibers to associated membranes
(small area of pleura, peritoneum and pericardium)

-it runs at anterior surf of Scalenus anterior m
-behind subclav vein (in lateral neck region)

-w.in thorax, desc in anterior mediastinum
-in front of pulmonary root
-milli fibrous pericardium og mediastinal pleura to the diaphragm

*acc. by pericardiophrenic vessels

Question 4

phrenic nerve frh

Answer 4

*right phrenic nerve:
passes thru central tendon of diaphragm (caval aperture)

*left phrenic nerve:
passes thru muscular p of diaphragm,
anterior to the central tendon

Question 5

phrenic nerve frh

Answer 5

*right phrenic nerve:
passes thru central tendon of diaphragm (caval aperture)

*left phrenic nerve:
passes thru muscular p of diaphragm,
anterior to the central tendon

Question 6

inferior root of ansa cervicalis (hypoglossal ansa)

Answer 6

connects with superior root of hypoglossal nerve
—> forming ansa cervicalis (hypoglossal ansa)
-gives motor fibers for infrahyoid mm

Question 7

muscular branches

Answer 7

supply prevertebral + lateral v.bral mm
-including:
rectus capitis anterior m
rectus capitis lateralis m
longus colli
longus capitis

Question 8

cutaneous - sensory branches

Answer 8

cut. branches visible in posterior triangle
as they pass dorsally on sternocleidomastoid m
in “punctum nervorum”

1) lesser occipital N:
-asc on post. border of sternocleidomastoid m
-distributes to the skin neck + scalp posterior to the ear

2) greater auricular N:
-asc across sternocleidomastoid m to base of ear
-supply skin parotid region, ear + mastoid area.

3) Transverse cervical N:
-passes around midpart of sternocleidomastoid,
asc horizontally across the muscle to supply
lateral + anterior p of neck

4) Supraclavicular nerves:
-descend + supply skin over clavicle and shoulder
as far as inferiorly as rib 2