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Uncinate process of vertebra

The uncinate process is a hook-shaped bony projection arising from the superolateral margins of the vertebral bodies of the cervical spine, typically from C3 to C7. It forms the medial component of the uncovertebral joints (joints of Luschka) and plays an important role in guiding cervical motion and maintaining stability.

It is a key anatomical landmark in cervical spine anatomy and imaging and is frequently evaluated in degenerative disease, alignment assessment, and preoperative planning.

Synonyms

  • Uncus of vertebra

  • Uncinate process

  • Component of uncovertebral joint

Location

  • Located on the superolateral edge of cervical vertebral bodies

  • Typically present from C3 to C7

  • Projects superiorly from the posterolateral margin of the vertebral body

  • Forms a pseudo-joint with the inferior surface of the vertebral body above

  • Situated medial to the intervertebral foramen

  • Anterior to the spinal canal

Anatomical components

  • Hook-shaped bony projection from the vertebral body

  • Articular surface:

    • Contacts the inferolateral margin of the superior vertebral body

  • Uncovertebral joint capsule:

    • Thin fibrous tissue surrounding the articulation

  • Adjacent structures:

    • Intervertebral disc (medially)

    • Vertebral artery (laterally, within transverse foramen)

Relations

Anteriorly:

  • Vertebral body and anterior longitudinal ligament

Posteriorly:

  • Spinal canal

  • Posterolateral disc margin

Laterally:

  • Transverse foramen

  • Vertebral artery

Medially:

  • Intervertebral disc

  • Posterior longitudinal ligament

Superiorly:

  • Inferior endplate of the vertebral body above

Inferiorly:

  • Vertebral body from which the uncinate process arises

Structures related to the uncinate process

  • Uncovertebral joint (joint of Luschka)

  • Intervertebral foramen

  • Exiting cervical nerve roots

  • Vertebral artery (adjacent lateral relation)

X-ray appearance

Cervical spine radiographs (AP and oblique views):

  • Uncinate processes: Seen as small hook-like bony projections along lateral margins of vertebral bodies

  • Uncovertebral joints: Appear as small joint spaces between adjacent vertebral bodies

  • Alignment: Symmetric appearance bilaterally in normal anatomy

CT appearance (pre-contrast)

Non-contrast CT:

  • Uncinate process: Well-defined cortical bone projection from the superolateral vertebral body

  • Cortex: Hyperdense outer margin with central cancellous bone

  • Joint space: Narrow cleft forming the uncovertebral articulation

  • Spatial relationships: Clear delineation from spinal canal, transverse foramen, and intervertebral foramen

MRI appearance

T1-weighted images:

  • Bone cortex: Low signal intensity

  • Cancellous marrow: Intermediate to high signal

  • Uncovertebral joint: Seen as a low-signal bony interface

T2-weighted images:

  • Cortical bone: Low signal

  • Marrow: Intermediate signal

  • Joint region: Low-signal bony margins with adjacent disc and soft tissues well visualized

STIR:

  • Bone marrow: Suppressed fat signal with intermediate background signal

  • Uncinate process: Remains low signal due to cortical bone

  • Useful for evaluating adjacent marrow and soft tissues

CT VRT 3D image

Uncinate process of vertebra

CT image

CT Uncinate process of vertebra of vertebra , Location and Imaging Appearance -img-00000-00000

CT image

Uncinate process of vertebra of vertebra , Location and Imaging Appearance -img-00000-00000

X ray image

X Ray The uncinate process