Interspinales
Description
Name
- Interspinales
- Interspinous Muscles
- Mm. Interspinales
General
- Deep muscle of the back
- Runs in between spinous processes along the vertebrae
- Often considered absent from the thoracic spine due to variable anatomy
- Present throughout the entire vertebral column
- Subsegments
- Interspinales Cervicis
- Interspinales Thoracis (commonly underdeveloped or absent)
- Interspinales Lumborum
Origin
- Interspinales Cervicis
- Superior aspect of spinous process of vertebrae C2-C7
- Interspinales Thoracis (commonly underdeveloped or absent)
- Superior aspect of spinous process of vertebrae T2, T11, & T12 (varies)
- Interspinales Lumborum
- Superior aspect of spinous process of vertebrae L2-L5
Insertion
- Interspinales Cervicis
- Inferior aspect of spinous process of vertebrae C1-C6
- Interspinales Thoracis (commonly underdeveloped or absent)
- Inferior aspect of spinous process of vertebrae T1, T10, & T11 (varies)
- Interspinales Lumborum
- Inferior aspect of spinous process of vertebrae L1-L4
Actions
- Extension and rotation of the spine
- Maintain posture
Vascular Supply
- Cervical
- Occipital Artery
- Deep Cervical Artery
- Transverse Cervical Artery
- Vertebral Artery
- Superior Intercostal Artery
- Posterior Intercostal Arteries
- Subcostal Arteries
- Lumbar
- Lumbar Arteries
Nerve
- Spinal nerves (Dorsal Rami)
Clinical Significance
- Needs to be updated