Rectus lateralis capitis muscle
Musculus rectus lateralis capitis
- Latin synonym: Musculus rectus capitis lateralis
- Synonym: Rectus capitis lateralis muscle
- Related terms: Rectus capitis lateralis
Definition
Rectus capitis lateralis muscle | |
Origin | Upper surface of the transverse process of the atlas |
Insertion | Under surface of the jugular process of the occipital bone |
Innervation | C1, C2 |
Blood supply | Vertebral, occipital, ascending pharyngeal arteries |
Action | Flexes the head laterally at the atlanto-occipital joint |
The rectus capitis lateralis is a short, deep muscle of the upper neck, lying lateral to the rectus capitis anterior. It connects the atlas (C1) to the occipital bone, and its main function is to stabilize and laterally flex the head at the atlanto-occipital joint.
Anatomical details
1. Origin
Superior surface of the transverse process of the atlas (C1)
2. Insertion
Fibres ascend vertically upwards and insert into the Jugular process of the occipital bone (just behind the jugular foramen).
Innervation
Ventral rami of C1 and C2 spinal nerves.
Relations
Aspect | Structures Related |
Anterior | Internal jugular vein and internal carotid artery (jugular foramen) |
Medial | Rectus capitis anterior muscle |
Actions
Laterally flexes the head to the same side (acting unilaterally). Works synergistically with the rectus capitis anterior and longus capitis to maintain craniovertebral stability.
References
Gray, H. (2016) Gray’s Anatomy: The Anatomical Basis of Clinical Practice. 41st edn. Edited by S. Standring. New York: Elsevier. Chapter 29: Neck, pp. 450.
