Transversus Abdominis

Description

Transversus Abdominis

Names

• Transversus Abdominis
• Transverse abdominal muscle (TVA)
• Transversalis muscle
• Transversus abdominis muscle

General

• Muscle layer of the anterior/lateral abdominal wall
• Deep to Internal Abdominal Oblique muscle
• Serves to compression/retain abdominal contents, assists in exhalation

Origin

• Ribs 7-12 (internal surface of costal cartilage)
• Thoracolumbar fascia
• Iliac Crest (anterior 2/3)
• Iliopectineal arch

Insertion

• Linea Alba
• Internal abdominal oblique (aponeurosis)
• Pubic Crest
• Pectinal Line of Pubis

Actions

• Bilateral contraction - Expiration
• Unilateral contraction - Trunk rotation (ipsilateral)

Vascular Supply

• Posterior Intercostal Arteries
• Subcostal Arteries
• Superior and Inferior Epigastric Arteries
• Superficial and Deep Circumflex Arteries
• Posterior Lumbar Arteries

Innervation

• Intercostal Nerves (T7-T11)
• Subcostal Nerve (T12)
• Iliohypogastric Nerve (L1)
• Ilioinguinal Nerve (L1)

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Clinical Significance

Procedural

• Transversus Abdominis Plane Block

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See Also

• Physical Exam Abdomen
• Abdomen Anatomy Main
• Abdominal Pain Main

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