Spinalis Cervicis

Back · Trunk

The Spinalis Cervicis is a Trunk muscle within the Back group. Its origin is Spinous processes of C7–T2 and the ligamentum nuchae, and it inserts onto Spinous process of the axis (C2), sometimes C3–C4. Its chief action is that it extends the cervical vertebral column. Innervation is provided by the Posterior (dorsal) rami of cervical spinal nerves.

Origin, Insertion, Action & Nerve

Origin

Spinous processes of C7–T2 and the ligamentum nuchae

Insertion

Spinous process of the axis (C2), sometimes C3–C4

Action

Extends the cervical vertebral column

Nerve

Posterior (dorsal) rami of cervical spinal nerves

Attachments explained

The Spinalis Cervicis is defined first by where it attaches. Its origin is the more fixed anchor, usually the proximal or more stable end that stays put during contraction, while its insertion is the more mobile point that is pulled toward the origin when the muscle shortens.

Origin

Spinous processes of C7–T2 and the ligamentum nuchae

Insertion

Spinous process of the axis (C2), sometimes C3–C4

Action & function

When the Spinalis Cervicis contracts, it produces the following movement: Extends the cervical vertebral column.

As part of the Back group of the Trunk, it works alongside neighbouring muscles to generate smooth, coordinated movement and to stabilise the structures it acts on.

Nerve supply & clinical relevance

The Spinalis Cervicis receives its nerve supply from the Posterior (dorsal) rami of cervical spinal nerves.

Because a muscle can only contract when its nerve is intact, injury to the Posterior can weaken or paralyse the Spinalis Cervicis, impairing the movements it normally produces (extends the cervical vertebral column). This is why knowing the innervation is central to localising nerve lesions in clinical practice.

How to study the Spinalis Cervicis (the OIANS method)

OIANS stands for Origin, Insertion, Action and Nerve, the four facts that uniquely define every skeletal muscle. To learn the Spinalis Cervicis, work through them in order: picture its origin, trace the muscle to its insertion, reason out the action that shortening between those two points must create, then add the nerve that drives it.

Most students remember the Spinalis Cervicis fastest by linking its action back to its attachments rather than memorising each fact in isolation. Once the origin and insertion make sense, the action usually follows logically.