92 SPECIAL ANATOMY. 



by skin, with two grooves, for the tendons of peronai, and a tubercle before 

 and above, important in a Surgical point of view, as a guide in exarticulatio 

 ped. Chopart. Internal surface, deeply concave, forms with 



b. Process, intern, s. minor, a blunt hook, projecting forwards and upwards, 

 and having an articular surface, for proc. anter. astrag., the Sinus torn, for the 

 tendons, vessels, and nerves of the sole of the foot. Below it a sulcus, for the 

 tendon flex, halluc. long. 



c. Process, ant. s. magnus, represents the anterior surface of the Corp. Cal~ 

 canei; has anterioly an articular surface, for os cuboid; is externally rough, for 

 abduct, digit. 5, and extens. brevis; internally a small process projects, sustenta- 

 culum tali. 



b. Anterior row, consists of five bones, namely : 



3. Os naviculare s. scaphoideum. Position: on the same side as the great 

 toe, before the talus, behind the three cuneiform bones, internal to the Cuboid. 

 Figure: longitudinal, flat. Posterior surface, concave, for Talus; anterior, 

 convex for the three cuneiform bones; superior, convex, free upon the back of 

 the foot; at the internal extremity, tuber, oss. navicularis, for attachment of m. 

 Tibialis posticus, perceptible through the skin ; at the external termination a 

 small articular surface, for the os cuboideum. 



4, 5, 6. Ossa cuneiformia, three small, four-sided bones. Position : between 

 Navicular and the three internal metatarsal bones. 



I. Os cuneiforme, at the side of the foot, the largest; internal surface, beneath 

 the skin; external, angular, for the second cuneiform and two metatarsal bones; 

 posterior concave, for the navicular; anterior rather convex, for the first meta- 

 tarsal; inferior, with tuberculum, for m. tibialis anticus. 



II. Os cuneiforme lies between I. arid II. ; is the smallest, for the second os 

 metatarsi. 



III. Os cuneiforme, between II. and the cuboid bone, for the third os metatarsi, 

 m. adductor, halluc. 



7. Os cuboideum. Cube bone. Position : before the calcis, behind the fourth 

 and fifth metatarsal bones, outside the navicular and os cuneiforme III. ; on the 

 outer, little toe, border. Superior surface, with sulcus oss. cub., for the tendon 

 of m. peroneeus long, on the outer border. Inferior surface, with the eminentia 

 obliqua, for ligam. cakan.-cuboid. 



Development. Calcis and Astragalus ossify even in the sixth 

 month of foetal existence ; the rest only in the first year after birth ; 

 but Tuber calcanei only in the tenth year. 



107. 2. Metatarsus, middle foot, 



consists of five columnar, parallel bones united like a grating with 

 four interstitia interossea. Position : horizontal between tarsus 

 and toes. Connection: behind with the three cuneiform and the 

 cuboid bones; before with the first phalanges of the toes; with 

 one another. Structure : the same as the long bones. 



a. Posterior extremity. .Basis, from the first to third metatarsal bone, cor- 

 responds with the three cuneiform bones ; that of the fourth and fifth with the 

 cuboid ; with one posterior, for the tarsus, and two or one lateral articular sur- 

 faces for the metatarsus. 



