Tunica flava abdominis
The yellow elastic abdominal tunic, a prominent elastic layer unique to large ungulates. This modified deep fascia lies superficial to the external abdominal oblique aponeurosis and provides passive elastic support to the heavy abdominal viscera. It is particularly well developed in horses and cattle, acting like a natural elastic girdle.
Origin: Tuber coxae; lateral femoral fascia
Insertion: Linea alba; costal arch; prepubic tendon
Action: Passive elastic support of abdominal viscera; supplements the abdominal muscles in supporting visceral weight
Innervation: Ventral branches of thoracic (T10–T18) and lumbar (L1–L3) spinal nerves
Strain or tearing of individual costal digitations of the external abdominal oblique, often from trauma (kicks) or sudden rotational movements. Common site for abdominal wall herniation in horses.
Strain or tearing of individual costal digitations of the external abdominal oblique, often from trauma (kicks) or sudden rotational movements. Common site for abdominal wall herniation in horses. Signs include: Localized swelling over the affected rib; pain on palpation; reluctance to bend laterally; may develop into a hernia if multiple digitations are disrupted.
See the External Abdominal Oblique - Abdominal Tunic (Tunica Flava Abdominis) on our interactive 3D horse model. Open 3D Model