Interspinales Cervicis 1–6
Back · Trunk
The interspinales cervicis are the best developed members of the interspinales group, reflecting the greater mobility of the neck. They are arranged as paired slips flanking the interspinous ligament, each passing from the superior surface of one cervical spinous process to the inferior surface of the spinous process of the vertebra above. Because cervical spinous processes are often bifid, these muscles fit neatly into the clefts between them. Their short, nearly vertical fibres extend the cervical vertebral column and provide precise segmental stabilisation as the head and neck move. They are innervated by the posterior (dorsal) rami of the cervical spinal nerves.
Origin, Insertion, Action & Nerve
Origin
Superior surface of a cervical spinous process
Insertion
Inferior surface of the spinous process of the vertebra above
Action
Extends the cervical vertebral column and stabilizes adjacent vertebrae
Nerve
Posterior (dorsal) rami of cervical spinal nerves
Attachments explained
The Interspinales Cervicis 1–6 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
Superior surface of a cervical spinous process
Insertion
Inferior surface of the spinous process of the vertebra above
Action & function
When the Interspinales Cervicis 1–6 contracts, it produces the following movement: Extends the cervical vertebral column and stabilizes adjacent vertebrae.
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 Interspinales Cervicis 1–6 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 Interspinales Cervicis 1–6, impairing the movements it normally produces (extends the cervical vertebral column and stabilizes adjacent vertebrae). This is why knowing the innervation is central to localising nerve lesions in clinical practice.
How to study the Interspinales Cervicis 1–6 (the OIANS method)
Learn the cervical interspinales as the prototype for the whole group, since they are the most constant and easiest to picture. Visualise a short cord filling the gap between two neighbouring spinous processes, running from the one below up to the one above. That mental image directly yields both the extension action and the stabilising role, so there is nothing extra to memorise separately.
Tie the muscle to its region to lock in details: the neck is the most mobile part of the spine, which is why these slips are so well formed here compared with the thoracic set. As with all deep intrinsic back muscles, the supply is by posterior (dorsal) rami, a single rule that spares you from learning each named nerve individually.
Frequently asked questions
Where is the Interspinales Cervicis 1–6 located?
The Interspinales Cervicis 1–6 is a muscle of the Back group, located in the Trunk.
What is the origin of the Interspinales Cervicis 1–6?
Superior surface of a cervical spinous process
What is the insertion of the Interspinales Cervicis 1–6?
Inferior surface of the spinous process of the vertebra above
What movements does the Interspinales Cervicis 1–6 produce?
Extends the cervical vertebral column and stabilizes adjacent vertebrae
What nerve supplies the Interspinales Cervicis 1–6?
Posterior (dorsal) rami of cervical spinal nerves
Is the Interspinales Cervicis 1–6 free to study in OIANS?
The Interspinales Cervicis 1–6 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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