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Questions and Answers
Which abdominal muscle is primarily responsible for pelvic-trunk rotation?
Which nerve root is not associated with the abdominal muscles?
What action is associated with the rectus abdominis muscle?
Which abdominal muscle contributes the least to trunk rotation?
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Which of the following nerves innervates the internal obliques?
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Study Notes
Abdominal Muscles Overview
- Rectus Abdominis: A long, flat muscle extending vertically along the front of the abdomen; crucial for trunk flexion.
- External Obliques: Located on the sides of the abdominal wall; aid in trunk rotation and lateral flexion.
- Internal Obliques: Found beneath the external obliques; assist with trunk rotation and abdominal compression.
- Transverse Abdominis: Deepest abdominal muscle; plays a significant role in stabilizing the pelvis and lower back.
Nerves Associated with Abdominal Muscles
- Intercostal Nerves: Provide innervation to the abdominal muscles, aiding in movement and support during respiration.
- Subcostal Nerve: Supplies the lower portion of the rectus abdominis and neighboring muscles.
- Iliohypogastric Nerve: Innervates the lower abdominal wall and contributes to various abdominal functions.
- Ilioinguinal Nerve: Provides sensation to the groin area and innervates lower abdominal muscles.
Nerve Roots
- T7-T11: Innervate various abdominal muscles and are key for trunk flexion and rotation.
- T12: Connects to rectus abdominis, contributing to overall abdominal function.
- L1 (via T12): Affects the lower abdominal muscles, particularly in flexion and stabilization.
Actions of Abdominal Muscles
- Pelvic-Trunk Rotation: Essential for coordinated movement and stability during physical activities.
- Trunk Rotation: Facilitates twisting movements of the torso, important in sports and daily activities.
- Abdominal Compression: Increases intra-abdominal pressure, critical for activities like heavy lifting and forceful exhalation.
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Description
Test your knowledge on the abdominal muscles, their actions, and the associated nerve roots. This quiz covers the rectus abdominis, external and internal obliques, as well as the transverse abdominis. Additionally, it delves into the relevant spinal nerves and their functions.
