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Pars medialis


Muscle parts

None

Latin name

Musculi intertransversarii posteriores mediales cervicis or colli

Latin muscle parts

None

Group

Epaxial muscle – Intertransversarii

Etymology

In English, this muscle’s name is the back, middle muscle between the crosswise processes of the neck vertebrae. The word intertransversarii comes from the Latin inter meaning “between” and the Latin term transversus for “crosswise,” which comes from Latin trans meaning “across, beyond, or through” and the Latin verb vertere meaning “to turn.” It is used in reference to the transverse processes of the vertebrae. The Latin term posterior is derived from the Latin post meaning “afterward.” Cervicis comes from the Latin cervix for “neck.” The word medialis comes from the Latin medius meaning “middle.”

Origin

Posterior surface of the articular processes of cervical vertebrae two through seven and the transverse process of the first thoracic vertebra

Insertion

Posterior surface of the articular processes of cervical vertebrae one through six

Action

Possibly weakly assist with extension of the cervical vertebrae. They are most likely proprioceptive transducers that monitor the position and movements of the vertebral column and provide feedback that influences the activity of the larger multisegmental muscles of the vertebral column.

Nerve supply

Dorsal rami of cervical spinal nerves (C3 to C8)

Blood supply

These small muscles receive their blood supply from the deep cervical artery, which arises from the costocervical trunk of the subclavian artery.

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