Cervical plexus

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 the sternocleidomastoid muscle.{{Citation|last1=Moskovitz|first1=Joshua B.|title=Chapter 11 - Regional Nerve Blocks of the Head and Neck|date=2015-01-01|url=http://www.sciencedirect.com/science/article/pii/B9780124103900000111|work=Nerves and Nerve Injuries|pages=147–151|editor-last=Tubbs|editor-first=R. Shane|place=San Diego|publisher=Academic Press|language=en|doi=10.1016/b978-0-12-410390-0.00011-1|isbn=978-0-12-410390-0|access-date=2020-10-25|last2=Choi|first2=Andrew|editor2-last=Rizk|editor2-first=Elias|editor3-last=Shoja|editor3-first=Mohammadali M.|editor4-last=Loukas|editor4-first=Marios|url-access=subscription}}

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 is situated deep to the sternocleidomastoid muscle, internal jugular vein, and deep cervical fascia.

It is situated anterior to the middle scalene muscle, and levator scapulae muscle.

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

• Cutaneous (4 branches):
• Lesser occipital nerve - innervates the skin and the scalp posterosuperior to the auricle (C2)
• Great auricular nerve - innervates skin near concha auricle (outer ear) and external acoustic meatus (ear canal) (C2-C3)
• Transverse cervical nerve - innervates anterior region of neck (C2 and C3)
• Supraclavicular nerves - innervate the skin above and below the clavicle (C3-C4)Clinically Oriented Anatomy by Moore and Dally's {{Clarify|date=July 2023|reason=Clarify preceeding reference - which edition?}}
• Muscular
• Ansa cervicalis - a loop formed by C1-C3 that supplies most infrahyoid (a.k.a. "strap") muscles (sternothyroid, sternohyoid, omohyoid muscles) etc.
• Nerve to thyrohyoid - fibres from C1 that run with the hypoglossal nerve (cranial nerve XII) and do not participate in the formation of the superior root of ansa cervicalis, instead continuing for some further distance to reach and innervate the thyrohyoid muscle and the geniohyoid muscle.
• Phrenic (C3-C5, but mostly C4) - innervates thoracic diaphragm and the pericardium.
• Segmental branches (C1-C4) - innervate anterior and middle scalene muscles
• Levator scapulae muscle (C3-C4) (also innervated by dorsal scapular nerve (C5) of the brachial plexus)

File:Cervical plexus.PNG

Image:Gray804.png|Plan of the cervical plexus.

Image:Gray805.png|The nerves of the scalp, face, and side of neck.

Image:Gray838.png|The right sympathetic chain and its connections with the thoracic, abdominal, and pelvic plexuses.

Image:Gray1210.png|Side of neck, showing chief surface markings.

• {{SUNYAnatomyFigs|25|03|02}} - "Diagram of the cervical plexus"
• {{MedicalMnemonics|268|||}}
• [http://kobiljak.msu.edu/cai/ANT551/Unit02/Topic04/U2_L4_O6.html Diagram at msu.edu] {{Webarchive|url=https://web.archive.org/web/20190603153001/http://kobiljak.msu.edu/cai/ANT551/Unit02/Topic04/U2_L4_O6.html |date=2019-06-03 }}

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Category:Nerve plexus

Category:Spinal nerves

Category:Nerves of the head and neck

Category:Thoracic nerves