Sacrospinalis muscle

Sacrospinalis Muscle

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Sacrospinalis muscle (highlighted in red)

The Sacrospinalis muscle or Erector spinae is a large muscle group that extends longitudinally along the back of the vertebral column from the sacrum to the base of the skull. It is composed of three columns of muscles, the Iliocostalis, Longissimus, and Spinalis, each of which runs parallel to the length of the spine on either side of the vertebral column.

Structure

The Sacrospinalis muscle is divided into three columns:

• Iliocostalis: The most lateral column, it is further divided into three parts: Iliocostalis lumborum, Iliocostalis thoracis, and Iliocostalis cervicis.
• Longissimus: The intermediate column, it is also divided into three parts: Longissimus thoracis, Longissimus cervicis, and Longissimus capitis.
• Spinalis: The most medial column, it is divided into three parts: Spinalis thoracis, Spinalis cervicis, and Spinalis capitis.

File:Sacrospinalis Muscle Diagram.png

Diagram showing the divisions of the Sacrospinalis muscle

Function

The Sacrospinalis muscle group is responsible for the extension and lateral flexion of the vertebral column, and rotation to the opposite side. These muscles also play a crucial role in maintaining posture and in movements of the back and neck.

Clinical significance

Due to its role in maintaining posture and back movements, any injury or strain to the Sacrospinalis muscle can lead to back pain and limited mobility. Conditions such as strains, spasms, and imbalances can affect the Sacrospinalis muscle.

See also

• Muscular system
• Back pain
• Posture