Page 77 - Adams and Stashak's Lameness in Horses, 7th Edition

Functional Anatomy of the Equine Musculoskeletal System 43

amount of gliding movement, so that nearly all of the cranial tibial muscle and attaches to the fused first and
hock’s range of motion arises from the tarsocrural joint. second tarsal bones and the second and third metatarsal
VetBooks.ir ligaments bind each side of the hock (Figures 1.38– attaches distally to the talus and the central and third
bones just distal to the cunean bursa. The deep layer
A long collateral ligament and three short collateral
tarsal bones. The plantar edge of the ligament attaches
1.40). The long lateral collateral ligament extends
43
from the lateral malleolus and attaches distally to the to the deep fascia over the sustentaculum tali and the
calcaneus, talus, fourth tarsal, lateral splint, and cannon ligament between the second and third metatarsal bones.
bones. The three short lateral collateral ligaments are The superficial short medial collateral ligament
fused proximally where they attach to the lateral malle­ extends from the medial malleolus to the tuberosities of
olus. The superficial component attaches distoplantarly the talus and the ridge between them (Figure 1.39). The
to both the talus and calcaneus, whereas the middle and middle short medial collateral ligament extends
deep short lateral collateral ligaments attach solely on obliquely from the medial tibial malleolus to the susten­
the lateral surface of the talus. taculum tali and central tarsal bone. It lies on the medial
The long medial collateral ligament of the hock has surface of the talus between the two tuberosities, vary­
less well‐defined borders than its lateral counterpart. ing in position during movement of the joints. The
From its proximal attachment on the medial malleolus, smallest component, the deep short medial collateral
the long medial collateral ligament extends distad and ligament, courses from the distal edge of the medial tib­
divides into two layers along its dorsal border. The ial malleolus obliquely to the ridge between the two
superficial layer passes over the cunean tendon of the tuberosities of the talus.

Medial malleolus Lateral malleolus

Superficial short lateral
Superficial short medial collateral ligament
collateral ligament
Long lateral
collateral ligament
Trochlea of talus
Long medial
collateral ligament

Central tarsal bone

Dorsal tarsal ligament
Third tarsal bone

Third metatarsal bone

Figure 1.40. Dorsal view of right tarsus.