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The three semispinalis muscles, span 4-6 vertebral segments: semispinalis thoracis; semispinalis cervicis; semispinalis capitis; The multifidus muscle, and spans 2-4 vertebral segments The rotatores muscles, lie beneath the multifidus, and spans 1-2 vertebral segments rotatores cervicis; rotatores thoracis; rotatores lumborum
The semispinalis capitis (complexus) is situated at the upper and back part of the neck, deep to the splenius muscles, and medial to the longissimus cervicis and longissimus capitis. It arises by a series of tendons from the tips of the transverse processes of the upper six or seven thoracic and the seventh cervical vertebrae , and from the ...
The multifidus (multifidus spinae; pl.: multifidi) muscle consists of a number of fleshy and tendinous fasciculi, which fill up the groove on either side of the spinous processes of the vertebrae, from the sacrum to the axis. While very thin, the multifidus muscle plays an important role in stabilizing the joints within the spine.
The rotatores muscles (rotatores spinae muscles) lie beneath the multifidus and are present in all spinal regions but are most prominent in the thoracic region.. Each muscle is small and somewhat quadrilateral in form; it arises from the superior and posterior part of the transverse process, and is inserted into the lower border and lateral surface of the lamina of the vertebra above, the ...
Spinalis dorsi, the medial continuation of the sacrospinalis, is scarcely separable as a distinct muscle.It is situated at the medial side of the longissimus dorsi, and is intimately blended with it; it arises by three or four tendons from the spinous processes of the first two lumbar and the last two thoracic vertebrae: these, uniting, form a small muscle which is inserted by separate tendons ...
Transversospinales – composed of semispinalis, multifidus and rotatores; Segmental muscles – composed of levatores costarum, interspinales and intertransversarii; The deep group is innervated by the posterior rami of spinal nerves. [2]
In the cervical region they are best developed, consisting of rounded muscular and tendinous fasciculi, and are placed in pairs, passing between the anterior and the posterior tubercles respectively of the transverse processes of two contiguous vertebrae, and separated from one another by an anterior primary division of the cervical nerve, which lies in the groove between them.
The levatores costarum (/ ˌ l ɛ v ə ˈ t ɔːr iː z k ə ˈ s t ɛər ə m /), twelve in number on either side, are small tendinous and fleshy bundles, which arise from the ends of the transverse processes of the seventh cervical and upper eleven thoracic vertebrae