GENERAL INFORMATION
The Intertransversarii are small muscles located between the transverse processes of the vertebrae in the spine. These muscles are divided into cervical, thoracic, and lumbar groups, each playing a crucial role in stabilising the vertebrae and facilitating slight lateral spinal movements. Additionally, these muscles are integral for maintaining proper spinal alignment and function throughout daily activities and specific movements.
ORIGIN
The Intertransversarii muscles originate from the transverse processes of the vertebrae. Each segment of the spine has its set of Intertransversarii, which originate from these bony projections, providing localised support and movement.
INSERTION POINT
They insert into the transverse processes of the adjacent vertebrae above their points of origin. This unique positioning allows them to control and stabilise the relative movements between individual vertebrae effectively.
MAJOR ARTERIES
The blood supply to the Intertransversarii muscles comes from the segmental arteries corresponding to each vertebral level, including the cervical, thoracic, and lumbar arteries. These arteries ensure that the muscles receive the necessary nutrients and oxygen for their functions.
NEURAL INNERVATION
The ventral rami of the spinal nerves provide neural innervation. This innervation allows for precise control over their contraction and relaxation, which is vital for proper spinal movement and stability.
TRIGGER POINT
Trigger points in the Intertransversarii can lead to localised pain and stiffness, often contributing to reduced spinal mobility and discomfort during lateral bending or twisting motions.
CONCENTRIC FUNCTION
Concentrically, the Intertransversarii muscles facilitate lateral flexion of the spine. This movement is essential for activities that require side-bending, such as reaching sideways or performing asymmetrical tasks.
ECCENTRIC FUNCTION
Eccentrically, these muscles control the opposite movement of returning the spine to a neutral position from a laterally flexed posture, ensuring smooth and coordinated movement.
ISOMETRIC FUNCTION
Isometrically, the Intertransversarii act to stabilise the spine during upright posture and other static positions, preventing unwanted lateral shifts or bends.
RELATED MUSCLE-SCIENTIFIC NAMES
- Multifidus: Provides stability and control to the vertebrae during movement.
- Rotatores: Assist in rotating the vertebral column and stabilising the spine.
- Levatores Costarum: Elevate the ribs, aiding in respiration and stabilising the thoracic spine.
- Lateral Pterygoid: Involved in jaw movements, stabilising the temporomandibular joint.
ANTAGONIST
- Rectus Abdominis: Flexes the spine and stabilises the core.
- External Oblique: Rotates and laterally flexes the spine, stabilising the trunk.
- Internal Oblique: Assists in rotating and laterally flexing the spine, contributing to trunk stability.
- Opposite Intertransversarii: Provide balance to lateral spinal movements, stabilising the spine.
COMMON INJURIES
- Muscle strains: Overuse or sudden movements can cause muscle fibre damage, leading to pain and weakness.
- Postural imbalances: Poor posture can lead to uneven stress on these muscles, causing pain and dysfunction.
- Stress injuries due to repetitive motion: Repetitive lateral bending or twisting can strain these muscles, leading to chronic pain.
EXERCISES
- Side Planks: Strengthen the lateral stabilisers of the spine, including the Intertransversarii, by maintaining a side-lying position against gravity.
- Lateral Leg Lifts: Enhance the activation of spinal lateral flexors by lifting the legs sideways while lying on one’s side.
- Dumbbell Side Bends: Target the Intertransversarii by bending the torso side-to-side while holding weights, increasing muscular endurance and strength.
- Cable Wood Chops: Involve a dynamic upper body movement that engages the lateral and rotational spinal muscles, promoting overall spinal health.
- Bird Dog Exercise: Enhance balance and stability by extending opposite arms and legs while on hands and knees, targeting the core and back muscles.
STRETCHES
- Standing Side Stretch: Reach overhead with one arm and lean to the opposite side to stretch the lateral spine muscles effectively.
- Seated Twists: Rotate the upper body while seated to stretch and mobilise the spine, enhancing the flexibility of the Intertransversarii.
- Cat-Camel Pose: Perform this dynamic spinal movement to increase mobility and relieve tension in the back muscles, including the Intertransversarii.
- Yoga Side Bends: Incorporate gentle side bends in various yoga poses to promote flexibility and relaxation in the spinal muscles.
- Knee-to-Chest Stretch: Pull one knee at a time towards the chest to stretch the lower back muscles and relieve tension.
