Intertransversarii

Intertransversarii
Intertransversarii muscles
Details
Origin	Transverse process
Insertion	Transverse process above
Nerve	Ventral rami and Dorsal rami of spinal nerves
Actions	Lateral flexion of trunk
Identifiers
Latin	Musculi intertransversarii
TA	A04.3.02.401
FMA	22848
*Anatomical terms of muscle* [edit on Wikidata]

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, 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 muscles connecting the anterior tubercles are termed the anterior intertransversarii.
Those between the posterior tubercles are termed the posterior intertransversarii.

Both sets are supplied by the anterior divisions of the spinal nerves.

There are seven pairs of these muscles, the first pair being between the atlas and axis, 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 vertebrae, and between the transverse processes of the last thoracic and the first lumbar. These are called the thoracic intertransversarii and are supplied by the posterior division of the spinal nerve.

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 vertebrae, are the lateral lumbar intertransversarii.
the other set, the medial lumbar intertransversarii, 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.

Function

They contribute little to movement on their own, but they stabilize adjoining vertebrae allowing more effective action from other muscle groups.

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

External links

-107347889 at GPnotebook
Intertransversarii at the Duke University Health System's Orthopedics program

Muscles of thorax and back

Back

splenius	capitis cervicis

erector spinae	iliocostalis longissimus spinalis

transversospinales	semispinalis thoracis semispinalis cervicis semispinalis capitis multifidus rotatores interspinales intertransversarii

Vertebral column	trapezius latissimus dorsi rhomboid major minor levator scapulae

Fascia	thoracolumbar fascia

Thorax

Intercostal muscle external internal innermost subcostalis transversus thoracis levatores costarum serratus posterior inferior superior thoracic diaphragm

Thoracic cavity	pectoralis major pectoralis minor subclavius serratus anterior sternalis

Fascia	pectoral fascia clavipectoral fascia

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