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SUBOCCIPITAL TRIANGLE - PowerPoint PPT Presentation


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SUBOCCIPITAL TRIANGLE. Bony Articulations. Occipital bone: Occipital condyles. Atlas: Posterior tubercle. Posterior arch. Anterior arch. Transverse process with foramina. Lateral masses: Articulation with occipital condyles. Articulation with axis. Bony Articulations. Axis:

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Presentation Transcript
bony articulations
Bony Articulations

Occipital bone:

Occipital condyles.

Atlas:

Posterior tubercle.

Posterior arch.

Anterior arch.

Transverse process with foramina.

Lateral masses:

Articulation with occipital condyles.

Articulation with axis.

bony articulations3
Bony Articulations

Axis:

Dens (odontoid process).

Spinous process.

Transverse processes with foramina.

vertebral column ligaments
Vertebral Column Ligaments
  • Anterior longitudinal ligament.
  • Posterior longitudinal ligament.
  • Ligamentum flavum.
  • Ligamentum nuchae:

Supraspinous + interspinous ligaments.

cervical and craniovertebral joints
Cervical and Craniovertebral Joints

Three synovial joints:

No intervertebral disc.

Between dens and anterior arch of the atlas.

Between lateral masses of atlas and axis (x2).

Ligaments:

Apical ligament.

Alar ligaments.

Cruciate ligaments.

Tectorial membrane.

suboccipital triangle muscles
Suboccipital Triangle Muscles
  • Obliquus capitis superior:

Weak extensor of the neck.

  • Obliquus capitis inferior:

Strong rotator of atlas.

  • Rectus capitis posterior major:

Extension of vertebral column.

  • Rectus capitis posterior minor:

Extension of vertebral column.

floor and roof
Floor and Roof
  • Floor:

Posterior atlanto-occipital membrane.

  • Roof:

Semispinalis capitis muscle.

suboccipital triangle contents
Suboccipital Triangle Contents
  • Suboccipital nerve:

Dorsal ramus of C1.

No sensory function and no dorsal root.

Motor to muscles of suboccipital triangle.

  • Greater occipital nerve:

Dorsal ramus of C2.

Sensory to back of skull.

suboccipital triangle contents9
Suboccipital Triangle Contents
  • Third occipital nerve:

Dorsal ramus of C3.

  • Vertebral artery.