The splenius capitis is a deep muscle of the back and neck that plays a critical role in head extension, rotation, and lateral flexion. Understanding its anatomy helps in diagnosing and managing neck pain, headaches, and postural imbalances. This article covers the origin, insertion, innervation, blood supply, function, clinical relevance, and practical exercises for this important muscle.
The splenius capitis muscle is part of the superficial layer of the intrinsic back muscles, located deep to the trapezius and sternocleidomastoid. It is a broad, strap-like muscle that lies on the back of the neck, connecting the lower cervical and upper thoracic spine to the skull.
The splenius capitis originates from the lower half of the ligamentum nuchae and the spinous processes of the seventh cervical vertebra (C7) and the upper three thoracic vertebrae (T1–T3). The ligamentum nuchae is a fibrous membrane that runs from the external occipital protuberance down to the spinous processes of the cervical vertebrae.
It inserts onto the mastoid process of the temporal bone and the lateral part of the superior nuchal line of the occipital bone. This insertion site is deep to the sternocleidomastoid and the trapezius muscles.
The splenius capitis is innervated by the dorsal rami of the middle and lower cervical spinal nerves, typically from C3 to C5. These posterior branches provide motor innervation to the intrinsic back muscles.
Blood is supplied primarily by muscular branches of the occipital artery (a branch of the external carotid artery) and the deep cervical artery (from the subclavian artery). Venous drainage follows the corresponding veins.
The splenius capitis acts bilaterally to extend the head and neck at the atlanto-occipital and cervical joints. Unilaterally, it rotates the head toward the same side and laterally flexes the neck.
“The splenius capitis is one of the primary extensors of the head. Without it, maintaining an upright posture against gravity would be significantly compromised.” – Adapted from clinical anatomy texts.
Tightness or trigger points in the splenius capitis can refer pain to the top of the head, back of the neck, and behind the eyes. This pattern is commonly seen in tension-type headaches and cervicogenic headaches.
To stretch the right splenius capitis, sit upright, tuck the chin slightly, then rotate your head to the left and flex it forward until you feel a gentle pull along the right side of your neck. Hold for 30 seconds and repeat on the other side.
Isometric neck extensions against hand resistance can activate the splenius capitis safely. Place your hands on the back of your head and press your head backward into your hands without moving. Hold for 5–10 seconds.
| Feature | Details |
|---|---|
| Origin | Ligamentum nuchae, spinous processes C7–T3 |
| Insertion | Mastoid process, lateral superior nuchal line |
| Innervation | Dorsal rami C3–C5 |
| Blood supply | Occipital artery, deep cervical artery |
| Actions (bilateral) | Head and neck extension |
| Actions (unilateral) | Ipsilateral rotation and lateral flexion |
Incorporating small habits can reduce stress on the splenius capitis. Adjust your workstation monitor so the top of the screen is at eye level. Avoid cradling the phone between your ear and shoulder.
“A healthy splenius capitis supports proper head posture and prevents chronic tension. Small daily corrections can make a significant difference over time.” – Common practice among physical therapists.
The splenius capitis muscle is a fundamental component of the cervical musculature, enabling essential head movements and maintaining postural stability. Its close relationship with the mastoid process and occipital bone makes it a frequent contributor to neck pain and headaches when dysfunctional. Understanding its anatomy, actions, and clinical relevance allows for better diagnosis, targeted stretching, and effective strengthening. Whether you are a healthcare professional, a student, or someone seeking relief from neck tension, respecting the splenius capitis and caring for it through proper ergonomics and exercise can greatly improve your quality of life.
The splenius capitis is a deep back muscle located at the back of the neck. It extends from the lower cervical and upper thoracic vertebrae to the skull, primarily acting to extend and rotate the head.
It originates from the ligamentum nuchae and the spinous processes of C7, T1, T2, and T3. It inserts onto the mastoid process of the temporal bone and the lateral part of the superior nuchal line of the occipital bone.
It receives motor innervation from the dorsal rami of the cervical spinal nerves, specifically C3, C4, and sometimes C5.
When both sides contract, it extends the head and neck. When one side contracts, it rotates the head to the same side and laterally flexes the neck toward that side.
Sit upright, tuck your chin slightly, then rotate your head to one side and gently flex it forward. Hold the stretch for 30 seconds. Repeat on the opposite side.
Tightness can cause referred pain to the top of the head, behind the eyes, and along the back of the neck. It often contributes to tension headaches and difficulty turning the head.
Yes. Trigger points in the splenius capitis are known to produce headache patterns that mimic cervicogenic headaches and tension-type headaches.
Isometric neck extension exercises (pressing the head backward into your hands) and prone neck lifts are effective. Start with low resistance and avoid any sharp pain.
The splenius capitis attaches to the skull, while the splenius cervicis attaches to the transverse processes of the upper cervical vertebrae. Both work together for neck extension and rotation, but the capitis primarily affects the head.
Forward head posture shortens the splenius capitis, leading to chronic tension, trigger points, and reduced range of motion. Correcting ergonomics and performing chin tucks can help restore balance.
