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|Nerve: Cervical plexus|
Dermatome distribution of the trigeminal nerve (Superficial cervical plexus visible in purple, at center bottom.)
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. 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.
The cervical plexus has two types of branches: cutaneous and muscular.
- Cutaneous (3 branches):
Lesser occipital - innervate the skin and the scalp posterosuperior to the auricle 
Additionally there are two branches formed by roots of spinal nerves:
- Preauricular nerve (from the posterior roots of C2–C3)
- Postauricular nerve (from the posterior roots of C3–C4)
- Clinically Oriented Anatomy by Moore and Dally's
- Robert Schwartzman (15 April 2008). Neurologic Examination. John Wiley & Sons. p. 58. ISBN 978-1-4051-7283-7.
- R.J. Schwartzman (31 July 2006). Differential Diagnosis in Neurology. IOS Press. pp. 326–. ISBN 978-1-60750-179-4.
- Anatomy at MUN nerve/cerplex
- Anatomy figure: 25:03-02 at Human Anatomy Online, SUNY Downstate Medical Center - "Diagram of the cervical plexus"
- Cervical+plexus at eMedicine Dictionary
- MedicalMnemonics.com: 268
- Diagram at msu.edu