Page 75 - Adams and Stashak's Lameness in Horses, 7th Edition

Functional Anatomy of the Equine Musculoskeletal System 41

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Lateral saphenous v .

Lateral digital extensor m.

Proximal extensor retinaculum Superficial digital
flexor tendon

Long digital extensor m.

Superficial short lateral
collateral ligament
Middle extensor retinaculum
Middle short lateral
collateral ligament

Short digital extensor m.
Long plantar ligament

Distal extensor retinaculum
Head of fourth metatarsal bone

Figure 1.38. Lateral view of left tarsus. The long lateral collateral ligament has been cut and reflected. A section of the lateral digital
extensor tendon has been removed.
The tarsal fascia thickens into a flexor retinaculum, plantar arteries. Medial and lateral plantar nerves from
bridging the groove on the calcaneus to form the tarsal the tibial nerve in the distal crural region also accom­
canal containing the principal tendon of the deep digital pany the principal DDFT (Figure 1.37). At the level of
flexor muscle. The tendon’s synovial sheath, the tarsal the tarsometatarsal joint, the medial plantar nerve and
sheath, extends from a level proximal to the medial artery cross obliquely over the plantar surface of the
malleolus to the proximal fourth of the metatarsus DDFT to the medial side of the tendon.
(Figure 1.35). After joining the anastomotic branch of
the caudal tibial artery just proximal to the tarsus, the
saphenous artery continues distad with the tendon Plantar Aspect
(Figure 1.37). It bifurcates at the level of the sustentacu­ In the distal third of the crus, the tendon of the super­
lum tali of the calcaneus into small medial and lateral ficial digital flexor muscle arcs around the medial side of