Erector spinae muscles

Erector Spinae Muscles

File:Erector spinae.png

Illustration of the erector spinae muscles

The Erector Spinae Muscles are a group of muscles and tendons, which run more or less vertically throughout the lumbar, thoracic and cervical regions of the vertebral column. They are the primary muscles responsible for maintaining upright posture and performing extension (backward bending) of the vertebral column.

Anatomy

The erector spinae is not just one muscle, but a group of muscles and tendons which are paired and run more or less vertically. It is divided into three columns:

• Iliocostalis - lateral column
• Longissimus - intermediate column
• Spinalis - medial column

Each of these columns has three parts, named for the regions of the spinal column to which they attach: cervicis (neck), thoracis (thorax), and lumborum (loin).

Function

The erector spinae muscles are extensor muscles that help in the movement of the back, such as lifting objects. They are also responsible for side bending (lateral flexion) and rotation of the spine. Their primary role is maintaining posture and alignment of the spine.

Clinical Significance

Problems with the erector spinae muscles can lead to back pain and other issues. Overuse, strain, or injury to these muscles can result in muscle spasms, inflammation, and pain.

See Also

• Spinal cord
• Muscular system
• Human anatomy