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Rotatores muscle

The rotatores are small, deep intrinsic back muscles that form part of the transversospinalis group, along with the multifidus and semispinalis. They are located throughout the thoracic region (best developed there) and are present variably in cervical and lumbar regions.

Each rotatores muscle arises from the transverse process of one vertebra and inserts onto the lamina and spinous process of the vertebra one (rotatores brevis) or two (rotatores longus) levels above. They lie deep to the multifidus and semispinalis muscles, closely associated with the vertebral arches.

The rotatores act as proprioceptive stabilizers of the vertebral column rather than powerful movers. They provide fine adjustments in posture and aid in intersegmental rotation and extension.

Synonyms

  • Musculi rotatores

  • Rotatores breves et longi

  • Deep transversospinalis muscles

Function

  • Assist in rotation of the vertebral column (contralateral)

  • Support extension and lateral flexion of spine (weak)

  • Most importantly, provide proprioceptive feedback for spinal alignment and posture

  • Contribute to stabilization of vertebrae during movement

Nerve Supply

  • Dorsal rami of spinal nerves at each vertebral level

Arterial Supply

  • Dorsal branches of posterior intercostal arteries (thoracic region)

  • Lumbar arteries (lumbar region)

  • Deep cervical arteries (cervical region, when present)

Venous Drainage

  • Corresponding posterior intercostal veins (thoracic)

  • Lumbar veins (lumbar)

  • Drain into azygos/hemiazygos system or vertebral venous plexus

MRI Appearance

T1-weighted images:

  • Muscles appear as intermediate signal intensity bundles adjacent to the laminae of vertebrae

  • Fatty infiltration (degeneration) appears hyperintense

T2-weighted images:

  • Normal muscle: intermediate to low signal

  • Acute strain, inflammation, or edema: hyperintense signal

STIR:

  • Highlights edema, muscle strain, or post-traumatic inflammation as bright hyperintensity

  • Useful in subtle injuries or degenerative changes

T1 Post-Gadolinium (Gd-enhanced MRI):

  • Normal muscle enhances mildly

  • Pathology (infection, tumor infiltration, myositis) shows abnormal enhancement

MRI Non-Contrast 3D Imaging:

  • Allows multiplanar visualization of deep spinal musculature in relation to vertebral arches

  • Useful in scoliosis, spinal stabilization surgery, and trauma assessment

CT Appearance

Non-contrast CT:

  • Rotatores muscles appear as soft tissue bundles adjacent to laminae, difficult to differentiate individually

  • Useful in detecting atrophy, fatty infiltration, or calcification

CT Post-Contrast:

  • Enhances surrounding vascular detail

  • May demonstrate muscle involvement by infection, tumor, or inflammatory processes

MRI image

Rotatores muscle anatomy MRI axial image -img-00000-00000

CT imag

Rotatores muscle anatomy ct axial image -img-00000-00000