Which spinal nerves innervate the Spinalis muscle?

The Spinalis muscle is part of the erector spinae group, primarily involved in extending and laterally flexing the vertebral column. This muscle has several components, including the Spinalis thoracis, Spinalis cervicis, and, in some cases, Spinalis capitis.

The correct answer identifies the innervation of the Spinalis muscle as coming from the lower cervical and thoracic spinal nerves. This is accurate because the Spinalis muscle is predominantly supplied by the dorsal rami of the thoracic spinal nerves, which serve the deeper muscles of the back, including the spinalis. Additionally, some fibers of the Spinalis cervicis are innervated by the lower cervical nerves, facilitating the connection and control of the cervical regions of the spine.

Understanding the specific spinal nerves that innervate the Spinalis muscle is important, particularly for assessing back strength, function in stability, and rehabilitation strategies. Recognizing the relationship between muscle innervation and spinal nerve levels allows for better clinical assessments and interventions concerning postural control and locomotive functions.