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Questions and Answers
What muscles are responsible for flexion of the cervical region?
What muscles are responsible for flexion of the cervical region?
- Longus cervicis
- Scalenus anterior
- Sternocleidomastoid
- All of the above (correct)
Which muscles are involved in the extension of the lumbar region?
Which muscles are involved in the extension of the lumbar region?
Postvertebral muscles
Lateral flexion of the lumbar region is primarily performed by quadratus lumborum and the _______ muscles.
Lateral flexion of the lumbar region is primarily performed by quadratus lumborum and the _______ muscles.
oblique muscles of anterolateral abdominal wall
The splenius muscle assists in rotation of the cervical region.
The splenius muscle assists in rotation of the cervical region.
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Study Notes
Cervical Region Movements
- Flexion: Occurs through the contraction of longus cervicis, scalenus anterior, and sternocleidomastoid muscles.
- Extension: Caused by the postvertebral muscles.
- Lateral Flexion: Achieved through the contraction of scalenus anterior and medius, trapezius, and sternocleidomastoid muscles.
- Rotation: Results from the combined action of sternocleidomastoid on one side and splenius on the other side.
Thoracic Region Movement
- Rotation: Produced by the unilateral contraction of semispinalis and rotatores muscles, supported by the oblique muscles of the anterolateral abdominal wall.
Lumbar Region Movements
- Flexion: Caused by the contraction of rectus abdominis and psoas muscles.
- Extension: Achieved through the action of postvertebral muscles.
- Lateral Flexion: Occurs through the contraction of quadratus lumborum, the oblique muscles of the anterolateral abdominal wall, and potentially the psoas muscle.
- Rotation: Results from the combined action of rotator muscles and the oblique muscles of the anterolateral abdominal wall.
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Description
This quiz covers the muscles responsible for flexion, extension, lateral flexion, and rotation in the cervical and thoracic regions of the spine.
