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10 Cards in this Set

  • Front
  • Back
ANSA CERVICALIS

SUPERIOR ROOT
2. Superior root: formed by fibers from the ventral ramus of Cl; courses
with the hypoglossal nerve before branching off'to join the inferior root
ANSA CERVICALIS

INFERIOR ROOT
3. Inferior root: formed by fibers from ventral rami C2 and C3; descends
in the carotid sheath and then emerges to form a loop with the superior
root, anterior to the common carotid artery
ANSA CERVICALIS

-branches...
4. Branches from the ansa cervicalis innervate the Sternohyoid, omohyoid,
and sternothyroid; the branch to the thyrohyoid continues with the hypo-
glossal nerve for a short distance
PHRENIC NERVE
E. Phrenic nerve

1. Motor nerve ofthe cervical plexus; derived from ventral rami C3, 4, and
5, especially C4
PHRENIC NERVE

Descends medially...
E. Phrenic nerve

2. Descends medially on the anterior surface of scalenus anterior, deep to
the prevertebral fascia; from superior to inferior, it is crossed anteriorly
by the transverse cervical artery, suprascapular artery, and subclavian
vein
PHRENIC NERVE

Passes between...
E. Phrenic nerve

3. Passes between the subclavian artery and vein medial to scalenus ante-
rior and then descends into the thorax
PHRENIC NERVE

-accessory phrenic nerve
E. Phrenic nerve

4. If the contribution from ventral ramus C5 descends lateral to the phrenic nerve, it is referred to as the accessory phrenic nerve; it usually joins the phrenic nerve above the first rib
BRACHIAL PLEXUS
F. Brachial plexus: formed by ventral rami C5, 6, 7, 8, and Tl, which emerge
from between scalenus anterior and scalenus medius with the subclavian
artery
SYMPATHETIC TRUNK

Descends posterior to the...
G. Sympathetic trunk

1. Descends posterior to the carotid sheath and anterior to the longus
capitis, longus colli, and prevertebral fascia; although there are eight
cervical spinal nerves there are only three cervical sympathetic ganglia,
as noted below
SYMPATHETIC TRUNK

Superior Cervical Ganglion
G. Sympathetic trunk

2. Superior cervical ganglion

a. Large, oblong, flattened structure lying on the longus capitis, ante-
rior to the transverse processes ofthe upper three cervical vertebrae;
postganglionic sympathetic fibers emerge from the superior cervi-
cal ganglion and are distributed to the head and neck along branches
ofthe internal and external carotid arteries as the internal and ex-
ternal carotid plexuses, respectively