Rectus Capitis Posterior Minor (Left) (Musculus rectus capitis posterior minor)
Educational content only — not medical advice.
Anatomy
The smallest and deepest medial muscle of the suboccipital group, situated medial to rectus capitis posterior major. It arises from the posterior tubercle of the atlas (C1) and expands as it ascends vertically to attach to the medial aspect of the inferior nuchal line of the occipital bone. Rather than generating forceful movement, its exceptionally high muscle-spindle density functions primarily as a fine proprioceptive sensor monitoring head position.
Origin & insertion
From the posterior tubercle of the posterior arch of the atlas (C1), into the medial part of the inferior nuchal line of the occipital bone and the surface between it and the foramen magnum.
Action
Assists in extending the head at the atlanto-occipital joint; provides critical proprioceptive feedback for head orientation in space.
Innervation
Suboccipital nerve (posterior ramus of C1 spinal nerve).
Clinical notes
Direct fibrous connections exist between this muscle and the posterior atlanto-occipital membrane and spinal dura; chronic spasm is implicated in cervicogenic tension cephalalgia.
Related structures
Educational references
FAQ
What is the role of the Rectus Capitis Posterior Minor (Left)?
The smallest and deepest medial muscle of the suboccipital group, situated medial to rectus capitis posterior major. It arises from the posterior tubercle of the atlas (C1) and expands as it ascends vertically to attach to the medial aspect of the inferior nuchal line of the occipital bone. Rather than generating forceful movement, its exceptionally high muscle-spindle density functions primarily as a fine proprioceptive sensor monitoring head position.
Why is the Rectus Capitis Posterior Minor (Left) clinically important?
Direct fibrous connections exist between this muscle and the posterior atlanto-occipital membrane and spinal dura; chronic spasm is implicated in cervicogenic tension cephalalgia.
Source & license
BodyParts3D, © The Database Center for Life Science licensed under CC Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/). license details