Superior Obliquus Capitis
Neck · Head & Neck
The superior obliquus capitis is one of the four suboccipital muscles that form the boundaries of the suboccipital triangle. It arises from the transverse process of the atlas and passes upward and slightly medially to insert on the occipital bone between the superior and inferior nuchal lines. Because its fibres run from the atlas up to the occiput, it extends the head at the atlanto-occipital joint and helps bend it toward the same side. Along with the other suboccipital muscles, it is supplied by the suboccipital nerve, the dorsal ramus of C1.
Origin, Insertion, Action & Nerve
Origin
Transverse process of the atlas (C1)
Insertion
Occipital bone between the superior and inferior nuchal lines
Action
Extends the head and bends it to the same side
Nerve
Suboccipital nerve (dorsal ramus of C1)
Attachments explained
The Superior Obliquus Capitis 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 process of the atlas (C1)
Insertion
Occipital bone between the superior and inferior nuchal lines
Action & function
When the Superior Obliquus Capitis contracts, it produces the following movement: Extends the head and bends it to the same side.
As part of the Neck group of the Head & Neck, it works alongside neighbouring muscles to generate smooth, coordinated movement and to stabilise the structures it acts on.
Nerve supply & clinical relevance
The Superior Obliquus Capitis receives its nerve supply from the Suboccipital nerve (dorsal ramus of C1). This nerve carries fibres from spinal segment(s) C1.
Because a muscle can only contract when its nerve is intact, injury to the Suboccipital nerve or to its spinal roots (C1) can weaken or paralyse the Superior Obliquus Capitis, impairing the movements it normally produces (extends the head and bends it to the same side). This is why knowing the innervation is central to localising nerve lesions in clinical practice.
How to study the Superior Obliquus Capitis (the OIANS method)
Place the superior obliquus capitis by its role as the upper lateral wall of the suboccipital triangle, running from the transverse process of the atlas up to the occipital bone. Because it climbs from the atlas to the skull, its action is extension of the head with a component of same-side bending, a movement you can reason out purely from the upward, slightly medial direction of its fibres.
Learn the whole suboccipital group under one nerve, the suboccipital nerve (dorsal ramus of C1), and contrast their function of postural control and proprioception with gross movement. Studying the superior oblique alongside the inferior oblique and the two rectus capitis posterior muscles as a set makes the shared C1 supply and the triangle they enclose easy to remember together.
Frequently asked questions
Where is the Superior Obliquus Capitis located?
The Superior Obliquus Capitis is a muscle of the Neck group, located in the Head & Neck.
What is the origin of the Superior Obliquus Capitis?
Transverse process of the atlas (C1)
What is the insertion of the Superior Obliquus Capitis?
Occipital bone between the superior and inferior nuchal lines
What movements does the Superior Obliquus Capitis produce?
Extends the head and bends it to the same side
What nerve supplies the Superior Obliquus Capitis?
Suboccipital nerve (dorsal ramus of C1)
Is the Superior Obliquus Capitis free to study in OIANS?
The Superior Obliquus Capitis 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 Head & Neck 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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