Which muscles are 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.
How many trunk muscles are there?
Muscles of the Abdomen Five muscles form the abdominal wall, divided into vertical and flat groups. The flat muscles act to flex, laterally flex, and rotate the trunk.
What muscles are involved in trunk flexion?
TRUNK FLEXION Any muscle with vertical or oblique fibers that connects the thorax with the pelvis assists in flexion of the trunk. The major actions involved are bilateral activity of the rectus abdominis, external and internal oblique, and psoas major.
What is the trunk in anatomy?
Trunk or torso is an anatomical term for the central part of the human body from which extend the neck and limbs. The trunk includes the thorax and abdomen.
What are the muscles between the ribs called?
The intercostal muscles are the muscles between the ribs. During breathing, these muscles normally tighten and pull the rib cage up. Your chest expands and the lungs fill with air.
What is the posterior trunk of the body?
The posterior trunk roughly encompasses the upper back from the shoulders to the lumbar area above the iliac crests.
What joint is the trunk?
Joints of the trunk include the intervertebral joints between the vertebral bodies and the vertebral arches, the costovertebral joints, and the sternocostal joints.
Which muscles are the primary trunk left rotators?
Transversospinalis Group
- The multifidus and rotatores of the transversospinalis group in the trunk lie within the laminar groove of the lumbar and thoracic spine.
- As a group, the transversospinalis extends, laterally flexes, and contralaterally rotates the trunk at the spinal joints.
What type of muscle contraction is trunk rotation?
Action. Flexion of the trunk is produced by concentric contraction of the external oblique, internal oblique and the rectus abdominis of both sides.
What key muscle rotates the trunk?
Internal oblique, helps rotate and turn the trunk. Transversus abdominis, helps stabilize the low back and pelvis.
Are the buttocks part of the trunk?
The trunk includes the thorax, often called chest, abdomen, and pelvis….Major Regions of the Trunk.
| Region | Location |
|---|---|
| Vertebral | Region over the vertebral column |
| Lumbar | Lower back region between the lowest ribs and the pelvis |
| Sacral | Region over the sacrum and between the buttocks |
| Gluteal | The buttocks |
Are there muscles under your ribs?
Intercostal muscles are muscles that present within the rib cage. Consist of three layers of muscles external, internal, and innermost layer they combine to fill the space between the ribs.
What muscles are in the trunk?
Muscles of the Trunk. 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 is the function of trunk muscles?
Trunk muscles have a few very important functions; they contribute to the protection of the thoracic and abdominopelvic viscera and they assist essential body activities such as breathing, movement, defecation and micturition .
What muscles extend the trunk?
The muscles that extend your trunk are mainly your erector spinae, posterior muscles that pull the chest back up when they contract. Also back there are the multifidi, which act to stabilize the spine during trunk extension, lateral flexion, and rotation.
Which muscles flex the trunk?
The muscles that flex your trunk are your rectus abdominis, external obliques, internal obliques, and transverse abdominis, all anterior muscles that pull the chest forward when they contract.