Introduction[edit | edit source]
The spinalis muscle group are part of the the erector spinae (ES) group (the intermediate layer of the intrinsic back muscles). The ES is made of three subgroups, with the group divisions occurring by location.
- Spinalis subgroup, most medial
- Longissimus subgroup, between spinalis and iliocostalis
- Iliocostalis subgroup, most lateral
Anatomy[edit | edit source]
The spinalis is innervated by the lateral branches of the posterior rami of the spinal nerves.
Function[edit | edit source]
Spinalis works synergistically with the other members of the erector spinae group. Erector spinae muscle group have 3 major functions.
- Unilateral contraction of erector spinae results in lateral flexion (ipsilateral) and rotation of the cervical, thoracic spine and lumbar spines.
- Bilateral contraction of erector spinae causes extension of the head, neck and cervical, thoracic and lumbar vertebrae.
- Helps to stabilize the pelvis while balancing on one leg. During this activity, the contralateral muscle group contracts and prevents the pelvis from dipping.
References[edit | edit source]
- Radiopedia Erector Spinae Available: https://radiopaedia.org/articles/erector-spinae-group?lang=us(accessed 4.2.2022)
- Britannica Spinalis Available:https://www.britannica.com/science/spinalis-muscle (accessed 4.2.2022)
- Spinalis Anatomy applied Available: https://anatomy.app/encyclopedia/spinalis(accessed 4.2.2022)
- Kenhub Spinalis Available: https://www.kenhub.com/en/library/anatomy/spinalis-muscle(accessed 4.2.2022)