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Medial Branch of Posterior Ramus of Fourth Cervical Nerve
Nervous System

Medial Branch of Posterior Ramus of Fourth Cervical Nerve

Ramus posterior medialis nervi cervicalis quarti

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Quick Facts

Origin: Posterior ramus of fourth cervical nerve.

Course: Winds medially around the articular pillar of C4 vertebra before terminating into its terminal branches in the multifidus muscle.

Branches: Posterior cutaneous branch.

Supply: Motor innervation to semispinalis capitis and colli, multifidus, and interspinales muscles. Sensory innervation to the skin of the posterior neck and to the zygapophyseal joints above and below the nerve.

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Origin

The medial branch of the posterior ramus of the fourth cervical nerve arises from the posterior ramus of the fourth cervical nerve. It is one of two branches, the other being the lateral branch.

Course

The medial branch of the posterior ramus of the fourth cervical nerve winds medially around the dorsal aspects of the articular pillar of the fourth cervical vertebra, while running deep to semispinalis capitis muscle before terminating into multifidus and giving terminal branches to the interspinales muscles.

Branches

The medial branch of the posterior ramus of the fourth cervical nerve gives rise to a posterior cutaneous branch.

Supplied Structures

The medial branch of the posterior ramus of the fourth cervical nerve provides motor innervation to multifidus, semispinalis colli, semispinalis capitis, and trapezius, before becoming cutaneous.

Somatic afferent neurons within the posterior cutaneous branch provide innervation to the skin overlying the trapezius and transmit general sensory information regarding pain, touch, pressure, vibration, etc.

Learn more about this topic from other Elsevier products

Cervical Nerves

ScienceDirect image

Burner or stinger syndrome is a syndrome resulting from injuries to either the upper cervical nerve roots or the upper trunk of BP.

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