Semispinalis Muscle
(Redirected from Semispinalis)
Description
Name
- Semispinalis Muscles
- Semispinalis Thoracis
- Semispinalis Cervicis
- Semispinalis Capitis
- Semispinalis
- Semispinalis Muscle Group
- Deep Paraspinal Muscle
- Transversospinalis Muscle
- Intrinsic Back Muscle
- Deep Back Extensor Muscle
General
- Group of 3 muscles that extend from the thorax to the posterior scalp
- Part of the Transversospinales Muscle group
Subsegments
- Semispinalis Thoracis
- Semispinalis Cervicis
- Semispinalis Capitis
Origin
- Transverse process of vertebrae C7-T12
Insertion
- Occipital bone between superior and inferior nuchal lines
- Spinous process of vertebrae C6-T4
Actions
- Bilateral: Extension of trunk, cervical spine, and head
- Unilateral: Sidebending of trunk, cervical spine, and head and rotation of trunk, cervical spine, and head to opposite side
Vascular Supply
- Occipital Artery
- Deep Cervical Artery
- Superior Intercostal Artery
- Posterior Intercostal Arteries
- Subcostal Arteries
- Lumbar Arteries
Innervation
- Greater Occipital Nerve
- Spinal nerves C1-T12 (Dorsal Rami)
Segments
Semispinalis Capitis
- Alternative names: Semispinalis complexus
- Situated in upper back, deep to splenius muscles, medial to longissimus muscles
- Origin: tip of transverse process of upper 6/7 thoracic, 7th cervical vertebrae, articular process of C4-C6
- Insert: superior and inferior nuchal lines
Semispinalis Cervicis
- Alternative names: semispinalis colli
- Origin: transverse process of upper 5/6 thoracic vertebrae
- Insert: the cervical spinous process of C1 to C5
Semispinalis Thoracis
- Alternative names: semispinalis dorsi
- Origin: series of small tendons of TP of 6th to 100th thoracic vertebrae
- Insert: spinous process of upper 4 thoracic, lower 2 cervical vertebrae
Clinical Significance
See Also
References
- ↑ Galbusera, F., and H. J. Wilke. "Biomechanics of the Spine: Basic Concepts." Spinal Disorders and Treatments. 1st ed: Academic Press, 2018. 456 p (2018).