- Peripheral Nervous System—Upper Extremity 53
DRAWING 3-12 Cervical Plexus — Complete
Jugular
foramen
C1
C2
C3
C4
C5
Lesser
occipital n.
(cutaneous)
Greater
auricular n.
(cutaneous)
Hypoglossal
canal
Hypoglossal nerve
Transverse
cervical n.
(cutaneous)
Sternocleidomastoid
muscle
Trapezius
muscle
Phrenic
nerve
Supraclavicular
nerve (cutaneous)
Ansa
cervicalis
Sternocleidomastoid
muscle
Spinal
accessory
nerve
Clavicle
Tongue muscles: intrinsic &
extrinsic (majority)
Genio- and thyrohyoid
Sternothyroid, sternohyoid,
and inferior omohyoid
Cervical plexus also provides innervation to the
anterior vertebral muscles, scalene muscles,
and the levator scapulae.
Inferior
root
Superior
root
Superior
omhyoid
Superior pinna/
post.lat. head
Inferior pinna/
mandible
Antero-
lateral
neck
Posterolateral neck, upper chest,
and shoulder
Diaphragm
(C2-C4)
(C3, C4)