Semispinalis Cervicis
Back · Trunk
Semispinalis cervicis is the cervical part of the semispinalis column, lying deep in the back of the neck as one of the transversospinales muscles. It arises from the transverse processes of the upper thoracic vertebrae (T1-T6) and runs upward and medially to insert on the spinous processes of the middle cervical vertebrae (C2-C5), with a particularly strong attachment onto the prominent spine of the axis. Its oblique course lets it extend the cervical spine and rotate it toward the opposite side. It is innervated by the posterior (dorsal) rami of the cervical spinal nerves. Working together with semispinalis capitis, it is an important contributor to holding the neck erect against the forward pull of the head.
Origin, Insertion, Action & Nerve
Origin
Transverse processes of T1–T6
Insertion
Spinous processes of C2–C5
Action
Extends the cervical spine and rotates it to the opposite side
Nerve
Posterior (dorsal) rami of cervical spinal nerves
Attachments explained
The Semispinalis 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
Transverse processes of T1–T6
Insertion
Spinous processes of C2–C5
Action & function
When the Semispinalis Cervicis contracts, it produces the following movement: Extends the cervical spine and rotates it to the opposite side.
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 Semispinalis 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 Semispinalis Cervicis, impairing the movements it normally produces (extends the cervical spine and rotates it to the opposite side). This is why knowing the innervation is central to localising nerve lesions in clinical practice.
How to study the Semispinalis Cervicis (the OIANS method)
Keep semispinalis cervicis in the transversospinales family by its oblique run from thoracic transverse processes up to cervical spinous processes. Because those fibres cross the midline as they ascend, the muscle extends the neck and turns it to the opposite side, the same rotational logic that governs the whole semispinalis group.
Distinguish it from its head-reaching partner: cervicis ends on the cervical spinous processes, especially the strong spine of the axis, whereas semispinalis capitis pushes on to the occipital bone. Studying the two together highlights how the deep semispinalis muscles work as a team to stabilise the neck, with cervicis handling the vertebral levels and capitis handling the skull.
Frequently asked questions
Where is the Semispinalis Cervicis located?
The Semispinalis Cervicis is a muscle of the Back group, located in the Trunk.
What is the origin of the Semispinalis Cervicis?
Transverse processes of T1–T6
What is the insertion of the Semispinalis Cervicis?
Spinous processes of C2–C5
What movements does the Semispinalis Cervicis produce?
Extends the cervical spine and rotates it to the opposite side
What nerve supplies the Semispinalis Cervicis?
Posterior (dorsal) rami of cervical spinal nerves
Is the Semispinalis Cervicis free to study in OIANS?
The Semispinalis Cervicis is always free to browse. Its full origin, insertion, action and nerve details are open to everyone in the Muscle Directory. Quiz and Flashcard practice for the Trunk is part of the one-time Lifetime upgrade, though; only the Upper Limb decks are free to test yourself on.
Related muscles
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