The interspinales are short
muscle fascicles, found in pairs between the spinous processes of the contiguous
vertebra
The spinal column, a defining synapomorphy shared by nearly all vertebrates,Hagfish are believed to have secondarily lost their spinal column is a moderately flexible series of vertebrae (singular vertebra), each constituting a characteristic ...
e, one on either side of the
interspinal ligament
The interspinous ligaments (interspinal ligaments) are thin and membranous ligaments, that connect adjoining spinous processes of the vertebra in the spine.
They extend from the root to the apex of each spinous process. They meet the ligamenta flav ...
.
* In the
cervical region the ''cervical interspinales'' are most distinct, and consist of six pairs, the first being situated between the
axis and third vertebra, and the last between the seventh cervical and the first thoracic. They are small narrow bundles, attached, above and below, to the apices of the spinous processes.
* In the
thoracic region the ''thoracic interspinales'' are found between the first and second vertebrae, and sometimes between the second and third, and between the eleventh and twelfth.
* In the
lumbar region
In tetrapod anatomy, lumbar is an adjective that means ''of or pertaining to the abdominal segment of the torso, between the diaphragm and the sacrum.''
The lumbar region is sometimes referred to as the lower spine, or as an area of the back i ...
there are four pairs of ''lumbar interspinales'' in the intervals between the five lumbar vertebrae. There is also occasionally one between the last thoracic and first lumbar, and one between the fifth lumbar and the
sacrum
The sacrum (plural: ''sacra'' or ''sacrums''), in human anatomy, is a large, triangular bone at the base of the spine that forms by the fusing of the sacral vertebrae (S1S5) between ages 18 and 30.
The sacrum situates at the upper, back part ...
.
See also
*
Intertransversarii
The intertransversarii are small muscles placed between the transverse processes of the vertebrae.
Structure Cervical
In the cervical region they are best developed, consisting of rounded muscular and tendinous fasciculi, and are placed in pairs, ...
*
Iliocostalis
*
Longissimus
*
Spinalis
The spinalis is a portion of the erector spinae, a bundle of muscles and tendons, located nearest to the spine. It is divided into three parts: Spinalis dorsi, spinalis cervicis, and spinalis capitis.
Spinalis dorsi
Spinalis dorsi, the medial co ...
*
Levatores costarum
The ''Levatores costarum'' (), 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
They pass obliquely downward ...
References
Back anatomy
Muscles of the torso
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