The interspinales are short
muscle fascicle
A muscle fascicle is a bundle of skeletal muscle fibers surrounded by perimysium, a type of connective tissue.
Structure
Muscle cells are grouped into muscle fascicles by enveloping perimysium connective tissue. Fascicles are bundled toge ...
s, found in pairs between the spinous processes of the contiguous
vertebra
Each vertebra (: vertebrae) is an irregular bone with a complex structure composed of bone and some hyaline cartilage, that make up the vertebral column or spine, of vertebrates. The proportions of the vertebrae differ according to their spina ...
e, one on either side of the
interspinal ligament.
* In the
cervical region, the ''cervical interspinales'' are most distinct, and consist of six pairs, the first being situated between the
axis
An axis (: axes) may refer to:
Mathematics
*A specific line (often a directed line) that plays an important role in some contexts. In particular:
** Coordinate axis of a coordinate system
*** ''x''-axis, ''y''-axis, ''z''-axis, common names ...
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.
Naming and location
The lumbar region is sometimes referred to as the lower spine, or as an ...
, 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 (: sacra or sacrums), in human anatomy, is a 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 of the pelvic cavity, ...
.
See also
*
Intertransversarii
*
Iliocostalis
Iliocostalis muscle is the muscle immediately lateral to the longissimus that is the nearest to the furrow that separates the epaxial muscles from the hypaxial. It lies very deep to the fleshy portion of the serratus posterior muscle. It late ...
*
Longissimus
The longissimus () is the muscle lateral to the semispinalis muscles. It is the longest subdivision of the erector spinae muscles that extends forward into the transverse processes of the posterior cervical vertebrae.
Structure
Longissimus th ...
*
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 c ...
*
Levatores costarum
References
Back anatomy
Muscles of the torso
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