Intertransversarii muscle
Encyclopedia
The Intertransversarii are small muscle
Muscle
Muscle is a contractile tissue of animals and is derived from the mesodermal layer of embryonic germ cells. Muscle cells contain contractile filaments that move past each other and change the size of the cell. They are classified as skeletal, cardiac, or smooth muscles. Their function is to...

s placed between the transverse processes of the vertebræ.

Cervical

In the cervical region they are best developed, consisting of rounded muscular and tendinous fasciculi
Muscle fascicle
In anatomy, a fascicle is a bundle of skeletal muscle fibers surrounded by perimysium, a type of connective tissue.Specialized muscle fibers in the heart that transmit electrical impulses from the Atrioventricular Node to the Purkinje Fibers are fascicles, also referred to as bundle branches...

, and are placed in pairs, passing between the anterior and the posterior tubercles respectively of the transverse processes of two contiguous vertebræ, and separated from one another by an anterior primary division of the cervical nerve, which lies in the groove between them.
  • The muscles connecting the anterior tubercles are termed the Intertransversarii anteriores.
  • Those between the posterior tubercles are termed the Intertransversarii posteriores.


Both sets are supplied by the anterior divisions of the spinal nerve
Spinal nerve
The term spinal nerve generally refers to a mixed spinal nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body...

s.

There are seven pairs of these muscles, the first pair being between the atlas
Atlas (anatomy)
In anatomy, the atlas is the most superior cervical vertebra of the spine.It is named for the Atlas of Greek mythology, because it supports the globe of the head....

 and axis
Axis (anatomy)
In anatomy, the second cervical vertebra of the spine is named the axis or epistropheus.It forms the pivot upon which the first cervical vertebra , which carries the head, rotates....

, and the last pair between the seventh cervical and first thoracic vertebræ.

Thoracic

In the thoracic region they are present between the transverse processes of the lower three thoracic vertebræ, and between the transverse processes of the last thoracic and the first lumbar
Lumbar
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 ...

.

Lumbar

In the lumbar region they are arranged in pairs, on either side of the vertebral column,
  • one set occupying the entire interspace between the transverse processes of the lumbar vertebræ, the Intertransversarii laterales.
  • the other set, Intertransversarii mediales, passing from the accessory process of one vertebra to the mammillary of the vertebra below.


The Intertransversarii laterales are supplied by the anterior divisions, and the Intertransversarii mediales by the posterior divisions of the spinal nerves.

Innervation

The intertransversarii muscle is primarily innervated by anterior rami of spinal nerves, but partly also from posterior rami.

External links

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