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the cervical plexus is a network of nerves formed in the neck.

formation : ventral rami of C1- 4 nerves. except first cervical nerve, other nerves divide into ascending and descending branches. these nerves unite to form loops on the anterior surface of the scalenus medius and levator scapulae muscles. the plexus is covered by the prevertebral fascia. the plexus is superficially related to sternocleidomastoid and internal jugular vein.

branches: they are classified into superficial, deep and communicating branches.

superficial branchesthey are cutaneous branches.

transverse cutaneous nerve of neck (C2,3)

lesser occipital nerve(C2)

greater auricular nerve(C2,3)

supraclavicular nerves(C3,4)

deep branchesanterior branches supply:

phrenic nerve(C3,4,5)- diaphragm

rectus capitis lateralis (C1)

rectus capitis anterior(C1)

longus capitis(C1-4)

longus colli (C3-8)

inferior limb of ansa cervicalis(C2-3)

scalenus anterior (C4,5,6)

posterior branches supplysternocleidomastoidc2

levator scapulae c3,4

trapezius- c 3,4

scalenus medius c3,4.

communicating branches:superior cervical sympathetic ganglion communicates with C1-4 nerves by grey rami communicantes
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