Anatomy study note · Abdomen

Transversus abdominis

The deepest of the three flat muscles of the anterolateral abdominal wall; its fibres run horizontally forward.

Key points

• Lower 6 costal cartilages, lumbar fascia, iliac crest, lateral 1/3 of inguinal ligament → xiphoid, linea alba, pubis.
• T7–T12 + iliohypogastric + ilioinguinal.
• Horizontal fibres; compresses the abdomen.
• Conjoint tendon with internal oblique.
• Trunk muscles: from myotomes of the somites.
• Dorsal part → dorsal-ramus muscles; ventral part → ventral-ramus muscles.
• Skeletal muscle: multinucleated, peripheral nuclei, striated.
• Epimysium → perimysium → endomysium.

The full note in the atlas also covers

Features · Origin · Insertion · Action · Nerve supply · Histology · Development

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 6, PDF pp. 700–702, 709, 713
• Inderbir Singh’s Human Embryology, ch. 7, PDF pp. 108–109
• BRS Cell Biology & Histology, 7th ed., ch. 8, PDF pp. 135–144

More from the abdomen

• Umbilical cord
• Ureter
• Vas deferens
• Abdominal aorta
• Abdominal lymph nodes
• Appendix
• Ascending colon
• Biliary tree
• Caecum
• Coeliac trunk
• Descending colon
• Duodenum

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