SDF and DDF check ligaments are present in both thoracic and pelvic limbs.

• A. True
• B. False
• C. Not sure
• D. Only thoracic limbs

Answer: (B)

The stay apparatus relies on how the flexor tendons are held and coordinated to keep a limb extended under load. In the forelimb, there are check ligaments that anchor the superficial and deep digital flexor tendons to bones, helping lock the limb and reduce muscular effort during weight bearing. This mechanism is a feature of the thoracic limb. The hind limb uses a different setup for stability, relying more on other structures such as the reciprocal apparatus and associated tendinous and ligamentous relationships, rather than the same forelimb-style check ligaments. Because of this difference, the SDF and DDF check ligaments are not present in both limbs. The statement is not correct.