382 THE HORSE. 
and magnum, one above and the other below the groove between .these 
three bones. 
Two interosseous ligaments from the superior and inferior sides of the 
forenamed groove. 
An interosseous ligament, running from the os scaphoides to the cunei- 
forme parvum. 
An wnterosseous ligament, running from the os scaphoides to the cunei- 
forme magnum. 
THE SYNOVIAL MEMBRANE is formed between the os scaphoides and os 
cuneiforme: this membrane belongs also to the two arthrodial surfaces 
existing on the upper parts of the internal surface of the os cuboides and 
os cuneiforme parvum. A capsule proper also exists between the superior 
surface of the astragalus, the superior surface of the os scaphoides, and os 
cuboides. <As to the arthrodial surfaces between the os cuneiforme medium 
on the one side, and the os cuboides and cuneiforme parvum on the other, 
they are supplied with synovial membranes by two prolongations from the 
tarso-metatarsal synovial capsule. 
Movements.—Scarcely any. 
ARTICULATIONS BETWEEN THE TWO ROWS.—This arthrodia is formed by 
the union of the inferior extremity of the astragalus and os calcis, on the 
one part, with the superior extremity of the os scaphoides and os cuboides 
on the other. This articulation has six principal ligaments. 
The two superficial lateral ligaments of the tibio-tarsal articulation. 
The calcaneo-metatarsal ligament, which unites the posterior border of 
the os calcis to the cuboid bone and to the head of the external small 
metatarsal bone. 
The astragalo-metatarsal ligament is a large radiating fasciculus, whose 
fibres run from the tuberosity of the astragalus, diverge, and become con- 
founded with the internal superficial tarsal ligaments on the ossa cunei- 
forme magnum, scaphoides, and the superior extremity of the large meta- 
tarsal bone. 
The posterior tarso-metatarsal ligament is very strong, and unites, poste- 
riorly, the tarsal bones to the three metatarsal bones ; it is continuous 
below with the suspensory ligament ; it mixes at the sides with the cal- 
caneo-metatarsal ligament, and with the internal and superficial tarsal 
ligament. 
An interosseous ligament is attached to the four bones which form this 
articulation. 
It IS PROVIDED WITH A SYNOVIAL CAPSULE, which always communicates 
in front with the tibio-tarsal capsule. This capsule prolongs itself supe- 
riorly between the os calcis and astragalus, to lubricate the two inferior 
arthrodial surfaces between these bones. It also descends between the 
os scaphoides, os cuboides, and the little arthrodial spots between the 
os cuneiforme and os cuboides. 
Movements.— Very limited ; gliding motion is only enjoyed. 
THE TARSO-METATARSAL ARTICULATION. 
THis Joint is formed by the meeting of three bones of the tarsus 
(the cuboid, os cuneiforme magnum, and os cuneiforme parvum), with the 
superior extremities of the three metatarsal bones, which are kept in 
contact through the medium of the superficial lateral ligaments of the 
tibio-tarsal articulation, the calcaneo-metatarsal and astragalo-metatarsal 
ligaments, and by a strong interossecus ligament, divided into three fas- 
eiculi, which are attached inferiorly to the three metatarsal bones, 
