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Nerve: Cervical plexus
Dermatome distribution of the trigeminal nerve (Superficial cervical plexus visible in purple, at center bottom.)
Latin	plexus cervicalis
Gray's	subject #210 925
From	C1-C4

The cervical plexus is a plexus of the ventral rami of the first four cervical spinal nerves which are located from C1 to C4 cervical segment in the neck. They are located laterally to the transverse processes between prevertebral muscles from the medial side and vertebral (m.scalenus, m.levator scapulae, m.splenius cervicis) from lateral side. Here there is anastomosis with accessory nerve, hypoglossal nerve and sympathetic trunk.

It is located in the neck, deep to sternocleidomastoid. Nerves formed from the cervical plexus innervate the back of the head, as well as some neck muscles. The branches of the cervical plexus emerge from the posterior triangle at the nerve point, a point which lies midway on the posterior border of the Sternocleidomastoid.

Contents 1 Branches 2 Diagram 3 Additional images 4 External links

[edit] Branches

The cervical plexus has two types of branches: cutaneous and muscular.

• Cutaneous (4 branches):
  • Lesser occipital nerve - innervates lateral part of occipital region (C2 ONLY)
  • Great auricular nerve - innervates skin near concha auricle and external acoustic meatus (C2&C3)
  • Transverse cervical nerve - innervates anterior region of neck (C2&C3)
  • Supraclavicular nerves - innervate region of suprascapularis, shoulder, and upper thoracic region (C3,C4)
• Muscular
  • Ansa cervicalis (loop formed from C1-C3), etc. (geniohyoid (C1 only), thyrohyoid (C1 only), sternothyroid, sternohyoid, omohyoid)
  • Phrenic (C3-C5 (primarily C4))-innervates diaphragm
  • Segmental branches (C1-C4)- innervates anterior and middle scalenes

[edit] Diagram

[edit] Additional images

Plan of the cervical plexus.

The nerves of the scalp, face, and side of neck.

The right sympathetic chain and its connections with the thoracic, abdominal, and pelvic plexuses.

Side of neck, showing chief surface markings.

[edit] External links

• Anatomy at MUN nerve/cerplex
• SUNY Figs 25:03-02 - "Diagram of the cervical plexus"
• Cervical+plexus at eMedicine Dictionary
• Mnemonic at medicalmnemonics.com 268
• Diagram at msu.edu

v • d • e Nerves: spinal nerves (TA A14.2, GA 9.916) Cervical (8) C1, C2, C3, C4, C5, C6, C7, C8 anterior (Cervical plexus, Brachial plexus) - posterior (Posterior branches of cervical nerves, Suboccipital - C1, Greater occipital - C2, Third occipital - C3) Thoracic (12) T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 anterior (Intercostal, Intercostobrachial - T2, Thoraco-abdominal nerves - T7-T11, Subcostal - T12) - posterior (Posterior branches of thoracic nerves) Lumbar (5) L1, L2, L3, L4, L5 anterior (Lumbar plexus, Lumbosacral trunk) · posterior (Posterior branches of the lumbar nerves, Superior cluneal L1-L3) Sacral (5) S1, S2, S3, S4, S5 anterior (Sacral plexus) · posterior (Posterior branches of sacral nerves, Medial cluneal nerves) Coccygeal (1) anterior (Coccygeal plexus) · posterior (Posterior branch of coccygeal nerve)

v • d • e Nerves of head and neck: the cervical plexus (C1-C4) (TA A14.2.02, GA 9.926) superficial C2: Lesser occipital, C2-C3:Greater auricular · Transverse cervical C3-C4: Supraclavicular deep C1-C3: Ansa cervicalis (superior root, inferior root) C3-C5: Phrenic