Rectus Capitis Posterior Minor
Neck · Head & Neck
The rectus capitis posterior minor is the smaller and more medial of the two posterior rectus muscles of the suboccipital region. It arises from the posterior tubercle of the atlas and ascends to insert on the medial part of the inferior nuchal line of the occipital bone. Lying close to the midline, it extends the head at the atlanto-occipital joint. It is supplied by the suboccipital nerve, the dorsal ramus of C1, and is notable for a fibrous connection between it and the dura mater, the myodural bridge.
Origin, Insertion, Action & Nerve
Origin
Posterior tubercle of the atlas (C1)
Insertion
Medial part of the inferior nuchal line of the occipital bone
Action
Extends the head at the atlanto-occipital joint
Nerve
Suboccipital nerve (dorsal ramus of C1)
Attachments explained
The Rectus Capitis Posterior Minor 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
Posterior tubercle of the atlas (C1)
Insertion
Medial part of the inferior nuchal line of the occipital bone
Action & function
When the Rectus Capitis Posterior Minor contracts, it produces the following movement: Extends the head at the atlanto-occipital joint.
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 Rectus Capitis Posterior Minor 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 Rectus Capitis Posterior Minor, impairing the movements it normally produces (extends the head at the atlanto-occipital joint). This is why knowing the innervation is central to localising nerve lesions in clinical practice.
How to study the Rectus Capitis Posterior Minor (the OIANS method)
Read the name to place the muscle: rectus capitis posterior minor is the smaller, straight, posterior head muscle sitting nearest the midline. Trace it from the posterior tubercle of the atlas, which lacks a true spinous process, up to the medial inferior nuchal line, and its role becomes clear as simple extension of the head at the atlanto-occipital joint.
Distinguish it from the posterior major by its lower origin on the atlas versus the axis, and remember both share the suboccipital nerve (dorsal ramus of C1). The memorable clinical detail is its myodural bridge to the dura mater, a connection implicated in some headaches, which gives this small muscle an outsized point of interest to anchor it in memory.
Frequently asked questions
Where is the Rectus Capitis Posterior Minor located?
The Rectus Capitis Posterior Minor is a muscle of the Neck group, located in the Head & Neck.
What is the origin of the Rectus Capitis Posterior Minor?
Posterior tubercle of the atlas (C1)
What is the insertion of the Rectus Capitis Posterior Minor?
Medial part of the inferior nuchal line of the occipital bone
What movements does the Rectus Capitis Posterior Minor produce?
Extends the head at the atlanto-occipital joint
What nerve supplies the Rectus Capitis Posterior Minor?
Suboccipital nerve (dorsal ramus of C1)
Is the Rectus Capitis Posterior Minor free to study in OIANS?
The Rectus Capitis Posterior Minor 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.
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