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Questions and Answers
What is the main action of the external oblique muscle?
What is the main action of the external oblique muscle?
Which muscle primarily flexes the lumbar vertebrae?
Which muscle primarily flexes the lumbar vertebrae?
What nerve innervates the transversus abdominis muscle?
What nerve innervates the transversus abdominis muscle?
Which structures serve as the insertion points for the internal oblique muscle?
Which structures serve as the insertion points for the internal oblique muscle?
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Which action is NOT associated with the transversus abdominis muscle?
Which action is NOT associated with the transversus abdominis muscle?
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Study Notes
Muscles of the Anterior Lateral Abdominal Wall
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External Oblique:
- Origin: External surfaces of ribs 5-12.
- Insertion: Linea alba, pubic tubercle, and anterior half of iliac crest.
- Innervation: Thoraco-abdominal nerves (T7-T11 spinal nerves), and subcostal nerve.
- Action: Compress and support abdominal viscera; flex and rotate the trunk.
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Internal Oblique:
- Origin: Thoracolumbar fascia, anterior two-thirds of iliac crest, and connective tissue deep to the lateral third of inguinal ligament.
- Insertion: Inferior borders of ribs 10-12, linea alba, and pecten pubis via conjoint tendon.
- Innervation: Thoraco-abdominal nerves (anterior rami of T6-T12 spinal nerves) and first lumbar nerve.
- Action: Compress and support abdominal viscera.
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Transversus Abdominis:
- Origin: Internal surfaces of costal cartilages 7-12, thoracolumbar fascia, iliac crest, and connective tissue deep to the lateral third of inguinal ligament.
- Insertion: Linea alba with aponeurosis of internal oblique, pubic crest, and pecten pubis via conjoint tendon.
- Innervation: Thoracic spinal nerves (anterior rami of T6-T12), and lumbar spinal nerves (specifically not mentioned in detail).
- Action: Compresses the abdomen.
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Rectus Abdominis:
- Origin: Pubic symphysis and pubic crest.
- Insertion: Xiphoid process and 5th to 7th costal cartilages.
- Innervation: Thoraco-abdominal nerves (anterior rami of T6-T12 spinal nerves).
- Action: Flex the trunk, compress abdominal viscera, stabilize and control pelvic tilt (antilordosis).
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Description
Test your knowledge on the muscles of the anterior lateral abdominal wall, including the external oblique, internal oblique, and transversus abdominis. Explore their origins, insertions, innervations, and actions. This quiz is perfect for students studying human anatomy.
