Splenius capitis muscle

Splenius capitis muscle
Muscles connecting the upper extremity to the vertebral column (splenius capitis et cervicis labeled at upper right).
Deep, posterior muscles of the neck. Left-sided splenius capitis is labeled 1. Left-sided splenius cervicis is labeled 1'. Nuchal ligament is labeled 9. (After Testut's Anatomy.)
Details
Origin	Nuchal ligament and spinous process of C7-T3
Insertion	Mastoid process of temporal and occipital bone
Artery	Muscular branches of the aorta
Nerve	Posterior ramus of spinal nerves C3 and C4
Actions	Extend, rotate, and laterally flex the head
Identifiers
Latin	musculus splenius capitis
TA98	A04.3.02.103
TA2	2273
FMA	22653
Anatomical terms of muscle

The splenius capitis (/ˈspliːniəs ˈkæpɪtɪs/) (from Greek splēníon 'bandage' and Latin caput 'head') is a broad, straplike muscle in the back of the neck. It pulls on the base of the skull from the vertebrae in the neck and upper thorax. It is involved in movements such as shaking the head.

Structure

It arises from the lower half of the nuchal ligament, from the spinous process of the seventh cervical vertebra, and from the spinous processes of the upper two thoracic vertebrae.

The fibers of the muscle are directed upward and laterally and are inserted, under cover of the sternocleidomastoideus, into the mastoid process of the temporal bone, and into the rough surface on the occipital bone just below the lateral third of the superior nuchal line. The splenius capitis is deep to sternocleidomastoideus at the mastoid process, and to the trapezius for its lower portion. It is one of the muscles that forms the floor of the posterior triangle of the neck.

The splenius capitis muscle is innervated by the posterior ramus of spinal nerves C3 and C4.

Function

The splenius capitis muscle is a prime mover for head extension. The splenius capitis can also allow lateral flexion and rotation of the cervical spine.

Additional images

• 
  Muscles of the neck. Lateral view.
• 
  Splenius capitis muscle
• 
  Splenius muscle
• 
  Splenius and Semispinalis

See also

This article uses anatomical terminology.

• Splenius cervicis muscle

References

This article incorporates text in the public domain from page 397 of the 20th edition of Gray's Anatomy (1918)

External links

• Anatomy figure: 01:03-01 at Human Anatomy Online, SUNY Downstate Medical Center - "Superficial layer of the extrinsic muscles of the back."
• Anatomy figure: 01:05-01 at Human Anatomy Online, SUNY Downstate Medical Center - "Intermediate layer of the extrinsic muscles of the back, deep muscles."
• Anatomy figure: 24:01-02 at Human Anatomy Online, SUNY Downstate Medical Center - "Identification of the muscles associated with the posterolateral triangle."
• PTCentral