What is the primary action of the longissimus Spinalis and iliocostalis muscles?
Additionally, longissimus thoracis and longissimus cervicis laterally flex the spine to the same side. Longissimus capitis can rotate the head to the same side. The three iliocostalis muscles all function bilaterally to extend the spine. Unilaterally they function to laterally flex the spine to the same side.
What are the 3 Spinalis muscles?
Spinalis is the most medial of the three erector spinae muscles. Like the other two, it is made up of three parts. Spinalis and longissimus both have capitis, cervicis and thoracis parts, while iliocostalis has cervicis, thoracis and lumborum parts.
Is the longissimus lateral to the iliocostalis?
Iliocostalis muscle is the muscle immediately lateral to the longissimus that is the nearest to the furrow that separates the epaxial muscles from the hypaxial. It lies very deep to the fleshy portion of the serratus posterior muscle. It laterally flexes the vertebral column to the same side.
What is the sacrospinalis muscle?
The erector spinae muscle, also known as sacrospinalis and extensor spinae in some texts is from the deep muscles of the back. It is formed of 3 muscles and its fibers run more or less vertically throughout the lumbar, thoracic and cervical regions. It lies in the groove to the side of the vertebral column.
What does the spinalis muscle do?
spinalis muscle, any of the deep muscles of the back near the vertebral column that, as part of the erector spinae (sacrospinalis) muscle group, assist in extension (e.g., bending backward), lateral flexion (bending to the side), and rotation of the spine.
Which of the following is an action of the spinalis?
| Spinalis | |
|---|---|
| Nerve | Posterior branch of spinal nerve |
| Actions | Laterally: Flex the head and neck to the same side. Bilaterally: Extend the vertebral column. |
| Antagonist | Rectus abdominis muscle |
| Identifiers |
Which of these spinalis iliocostalis and longissimus lies most laterally?
The longissimus muscle lies lateral to the spinalis dorsi and can be separated into three distinct muscle bundles in the lumbar region. The iliocostalis muscle is located over the most lateral part of the ribs and is covered by the serratus dorsalis muscle.
Where is the Spinalis muscle?