The spinal muscles and ligaments work in conjunction to help support the spine, maintain an upright posture, and control movements during activity and rest. The muscles are named based on shape, location, or a combination. Further categorization factors include muscle functions like flexion, extension, or rotation. Skeletal muscle is a form of striated muscle tissue that is voluntarily controlled by the somatic nervous system. Striated means it is striped in appearance. Most skeletal muscles are attached to bones by collagen fibers known as tendons.
Vertebral Muscle Types
Location
Forward flexors
Anterior
Lateral flexors
Lateral
Rotators
Lateral
Extensors
Posterior
It has the fastest contraction rate of all muscles. Before muscle/s contract, a nerve impulse starts in the brain and runs through the spinal cord to the muscle. For the muscles to contract and work properly they need energy/fuel. Mitochondria produce Adenosine triphosphate chemical cells that are needed for energy. Adenosine triphosphate is made as the mitochondria burn glucose or sugar. The blood vessels deliver the oxygen and nutrients that the mitochondria need to maintain a steady supply of adenosine triphosphate.
The Posterior Cervical and Upper Thoracic Spinal Muscles
Semispinalis Capitus – controls the head rotation and backward pulls
Iliocostalis Cervicis – extends the cervical vertebrae
The Longissimus Cervicus – extends the cervical vertebrae
Longissimus Capitus – controls the head’s rotation and backward pulls
Longissimus Thoracis – controls the extension/lateral flexion of the vertebral column and rib rotation
Iliocostalis Thoracis – controls the extension/lateral flexion of the vertebral column and rib rotation
Semispinalis Thoracis – extends and rotates the vertebral column
Muscles of the Spinal Column
Cervical muscles
Cervical Muscles
Function
Nerve
Sternocleidomastoid
Extends and rotates the head and flexes the vertebral column
C2, C3
Scalenus
Flexes and rotates the neck
Lower cervical
Spinalis Cervicis
Extends and rotates the head
Middle/lower cervical
Spinalis Capitus
Extends and rotates the head
Middle/lower cervical
Semispinalis Cervicis
Extends and rotates the vertebral column
Middle/lower cervical
Semispinalis Capitus
Rotates the head and pulls backward
C1-C5
Splenius Cervicis
Extends the vertebral column
Middle/lower cervical
Longus Colli Cervicis
Flexes the cervical vertebrae
C2-C7
Longus Capitus
Flexes the head
C1-C3
Rectus Capitus Anterior
Flexes the head
C2, C3
Rectus Capitus Lateralis
Bends the head laterally
C2, C3
Iliocostalis Cervicis
Extends the cervical vertebrae
Middle/lower cervical
Longissimus Cervicis
Extends the cervical vertebrae
Middle/lower cervical
Longissimus Capitus
Rotates the head and pulls backward
Middle/lower cervical
Rectus Capitus Posterior Major
Extends and rotates the head
Suboccipital
Rectus Capitus Posterior Minor
Extends the head
Suboccipital
Obliquus Capitus Inferior
Rotates the atlas
Suboccipital
Obliquus Capitus Superior
Extends and bends the head laterally
Suboccipital
Thoracic Muscles
Thoracic muscles
Function
Nerve
Longissimus Thoracis
Extension, lateral flexion of the vertebral column, and rib rotation
Perimysium is the sheath that groups the muscle fibers into bundles.
Endomysium is another type of connective tissue that sheaths each muscle fiber.
The cause of back pain and spinal muscle spasm/s can be caused by overuse, automobile accident, personal, work, or sports injury. The root cause of muscle spasm/s is usually a consequence of an injury to a structure within the lumbar spine. If there have been one or more episodes of muscle spasm in the low back, chances are it will re-occur. The muscles in the low back work together with the abdominal muscles. The spinal muscles add stability by maintaining an erect spine and maintain balance.
Back Pain Specialist
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