Medial lobe

In horses, the deep digital flexor tendon (DDFT) is the single distal continuation of the deep digital flexor muscle.

The deep digital flexor tendon arises as three bellies from its origin on the medial humeral epicondyle, fusing to form a common tendon just proximal to the carpus on the caudal aspect of the limb. The single tendon passes distally, enclosed in the carpal sheath, through the carpal canal. In the mid-metacarpal region, the tendon is enforced by an accessory ligament (inferior check ligament). At the metacarpophalangeal (fetlock) joint, the DDFT passes though the manica flexoria and over the sesamoid groove. In the mid–region of the proximal phalanx, the DDFT runs between the branches of the SDFT (where the SDFT presents two lobes (medial and lateral lobes) and over the flexor cortex of the distal sesamoid bone to insert on the flexor cortex of the distal phalanx.

• Origin: Deep digital flexor muscle on the medial humeral epicondyle, radius and ulna
• Insertion: Distal phalanx.
• Action: Flexes the distal phalanx.

sources : wikivet (https://en.wikivet.net/Tendons_-_Horse_Anatomy)