Rectus Abdominis Muscle: Anatomy and Clinical Significance
Introduction
The rectus abdominis is a paired, long, flat muscle located vertically on the anterior abdominal wall. It is commonly known as the "six-pack" muscle and plays a key role in trunk flexion and maintaining abdominal tone.
Anatomy of the Rectus Abdominis
Origin
- Pubic symphysis: The pubic crest and pubic tubercle.
- Pubic bone: The pubic crest and pubic tubercle.
Insertion
- Xiphoid process: The inferior aspect of the sternum.
- Costal cartilages: Ribs 5-7.
Innervation
- Intercostal nerves (T7-T11): Supply the upper part.
- Subcostal nerve (T12): Supplies the lower part.
Blood Supply
- Superior and inferior epigastric arteries.
Functions of the Rectus Abdominis
- Flexion of the lumbar spine: Bending the trunk forward.
- Stabilization of the pelvis: During movement and posture maintenance.
- Increase intra-abdominal pressure: Important in respiration, defecation, and childbirth.
Clinical Significance
Injuries and Disorders
- Rectus abdominis strain or tear: Common in athletes performing sudden trunk movements.
- Rectus diastasis: Separation of the muscle fibers along the linea alba, often seen in pregnant women.
- Abdominal hernias: Weakness in the abdominal wall can lead to hernias.
Signs and Symptoms
- Lower abdominal pain or bulging.
- Weakness in trunk flexion or core stability.
Management
Includes rest, physiotherapy, and surgical intervention if necessary.
Summary
The rectus abdominis is vital for trunk flexion, posture, and intra-abdominal pressure regulation. Understanding its anatomy aids in diagnosing abdominal injuries and managing core stability issues.
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