What muscles laterally flex the trunk?

The primary muscles involved in lateral flexion of the torso are the internal and external obliques, the quadratus lumborum and the erector spinae. Other muscles — including the rectus abdominis, iliopsoas and semispinalis — assist with the movement.

What are lateral trunk flexors?

The lateral trunk flexors (Table 1) act unilat- erally in the frontal plane to side-bend the trunk by pulling the rib cage toward the hip, and they act bilaterally to stabilize the spine. A large number of muscles act to laterally flex the trunk and thus play a significant role in spinal stability.

Which set of muscles would you use for lateral bending and rotation of the trunk?

The internal abdominal oblique attaches from the inguinal ligament, iliac crest, and thoracolumbar fascia to the lower three ribs and the abdominal aponeurosis. The internal abdominal oblique flexes, laterally flexes, and ipsilaterally rotates the trunk at the spinal joints.

What are muscles of the trunk?

There are five muscles that form the abdominal part of the anterior trunk. These are the rectus abdominis, pyramidalis, external abdominal oblique, internal abdominal oblique and transversus abdominis. The first three are classified as vertical muscles and they are located near the midline.

Which muscle rotates the trunk when it acts unilaterally?

Internal obliques
Anterolateral Abdominal Wall Muscles Internal obliques directed superiomedially perpendicular to the external obliques it acts unilaterally for ipsilateral trunk rotation and side flexion and bilaterally to compress the abdominal viscera, pushing them up into the diaphragm, resulting in a forced expiration.

Which muscles rotate the trunk?

Trunk rotation is a key risk factor for low back pain1, 2). During rotation, the external oblique (EO), rectus abdominis (RA) and lumbar multifidus (MF) muscles act contralaterally, whereas the latissimus dorsi (LD), internal oblique (IO) and transversus abdominis (TrA) muscles act ipsilaterally3,4,5,6).

What muscles perform right trunk rotation?

How many muscles are in trunk?

Five muscles form the abdominal wall, divided into vertical and flat groups. The flat muscles act to flex, laterally flex, and rotate the trunk.

Where is the trunk muscles?

The muscles of the trunk include those that move the vertebral column, the muscles that form the thoracic and abdominal walls, and those that cover the pelvic outlet. The erector spinae group of muscles on each side of the vertebral column is a large muscle mass that extends from the sacrum to the skull.

What muscles do right trunk rotation?

Trunk rotation is a movement that involves the thoracic and lumbar vertebrae and surrounding muscles including:

• External oblique, side abs that help rotate the trunk.
• Rectus abdominis, flexes the torso and spine.
• Lumbar multifidus, helps stabilize the spine.
• Internal oblique, helps rotate and turn the trunk.