Spinalis Muscle: Key to Neck and Trunk Movement
The spinalis muscle, a key component of the erector spinae, plays a crucial role in neck and trunk movement. It is divided into three parts, each with distinct origins and insertions.
The spinalis dorsi, the largest part, originates from the spinous processes of lower spinal vertebrae and inserts at the skull's base. It is innervated by posterior branches of spinal nerves C2 to L3. The spinalis cervicis, an inconstant muscle, originates at the spinous processes of C7 and T1 vertebrae and inserts into the spinous process of the axis and sometimes its two lower vertebrae. The spinalis capitis, often connected with the semispinalis capitis, also inserts at the skull's base.
The spinalis muscle's primary function is to extend and laterally bend the neck and trunk. It is the most medial deep back muscle, located near the spine, and works in conjunction with other erector spinae muscles for stability and movement.
Understanding the spinalis muscle's anatomy and function is vital for diagnosing and treating back and neck issues. Its three parts, spinalis dorsi, spinalis cervicis, and spinalis capitis, work together to support and move the neck and trunk, contributing to overall posture and mobility.
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