TARSO-METATARSAL ARTICULATION. 



1(5? 



Actions. The movements permitted by the articulation between the 

 astragalus and os calcis, are a slight degree of gliding, in the directions 

 forwards and backwards and laterally from side to side. The movements 

 of the second range of tarsal bones is very trifling, being greater betweer 

 the scaphoid and three cuneiform bones than in the other articulations. 

 The movements occurring between the first and second range are the 

 most considerable ; they are adduction and abduction, and, in a minor 

 degree, flexion, which increases the arch of the foot, and extension, which 

 flattens the arch. 



6. Tarso-metatarsal Articulation. The ligaments of this articulation are, 



Dorsal, 



Plantar, 



Interosseous. 



Fig. 99. 



The dorsal ligaments connect the metatarsal to the tarsal bones, and 

 the metatarsal bones with each other. The precise arrangement of these 

 ligaments is of little importance, but it may be remarked, that the base 

 of the second metatarsal bone, articulating with the three cuneiform bones, 

 receives a ligamentous slip from each, while the rest, articulating with a 

 single tarsal bone, receive only a single tarsal slip. 



The plantar ligaments have the same disposition on 

 the plantar surface. 



The interosseous ligaments are situated between the 

 bases of the metatarsal bones of the four lesser toes ; 

 and also between the bases of the second and third 

 metatarsal bones, and the internal and external cunei- 

 form bones. 



The metatarsal bone of the second toe is implanted 

 by its base between the internal and external cuneiform 

 bones, and is the most strongly articulated of all the 

 metatarsal bones. This disposition must be recollected 

 in amputation at the tarso-metatarsal articulation. 



The synovial membranes of this articulation are three 11 

 in number : one for the metatarsal bone of the great 

 toe ; one for the second and third metatarsal bones, 

 which is continuous with the great tarsal synovial mem- 

 brane ; and one for the fourth and fifth metatarsal 

 bones. 



Actions. The movements of the metatarsal bones 

 upon the tarsal, and upon each other, are very slight ; 

 they are such only as contribute to the strength of the 

 foot by permitting of a certain degree of yielding to opposing forces. 



7. Metatarsal-phalangeal Articulation. The ligaments of this articui* 

 tion, like those of the articulation between the first phalanges and meta- 

 carpal bones of the hand, are, 



Anterior or plantar, 



Two lateral, 



Transverse. 



The ligaments of the sole of the foot. 1. The os calcis. 2. The astragalus. 3. Tne 

 tuberosity of the scaphoid bone. 4. The long calcaneo-cuboid ligament. 5. Part of the 

 short calcaneo-cuboid ligament. 6. The calcaneo-scaphoid ligament. 7. The plantar 

 tarsal ligaments. 8, 8. The tendon of the peroneus longus muscle. 9, 9. Plantar tarso- 

 metatarsal ligaments. 10. Plantar ligament of the metatarso-phalangeal articulation of 

 the great toe ; the same ligament is seen upon the other toes. 11. Lateral ligaments of 

 the metatarso-phalangeal articulation. 12. Transverse ligament. 13. The lateral liga 

 merits of the phalanges of the great toe ; the same ligaments are seen upon the other 

 toes. 



