THE BONES. 93 



I. Os metatarsi, for m. tibial. antic., flex, brevis, abduct, hattucis, on the great 

 toe border; very* strong; the posterior, articular surface, for the first cuneiform 

 bone, longitudinally concave, both lateral surfaces wanting ; on the Plantar 

 border, tuberculum plantare, for tendon of Peron&us long. 



II. Os metatarsi, with three articular surfaces for the three cuneiform bones 

 [two lateral, one posterior], and one for the third os metatarsi. 



III. Os metatarsi; three articular surfaces, namely, one behind for third 

 cuneiform, two lateral for second and third os metatarsi. III. and IV. for m. 

 adductor hattucis. 



V. Os metatarsi, for peronmis 3, flex, brevis digiti 5, with only one lateral 

 articular surface for the IV. os metatarsi; and tuberositas on the free outer 

 border, for m. peronaus brevis s. Proc. triangularis and abductor digiti 5, pro- 

 jects backwards and outwards, important in exarticulatia metatarsi. 



b. Middle portion, diaphysis,for m. interossei; three-sided. Superior surface 

 rather convex ; internal and external meet below in the concave, plantar sur- 

 face, at an acute angle. I. II., os metatars., are the longest and strongest. V., 

 flat and thick. 



c. Anterior extremity, capitulum, with anterior, convex, articular surface, 

 which is largest in the sole; and two lateral fossae, sinus, and two tuber- 

 cula, for ligam. lateralia. 



The first os metatars. projects into the sole of the foot, ball ; and has two 

 grooves, for ossa sesamoidea. IV. and V., for caput breve m. transversal, pedis. 



Development of the metatarsus begins in the third foetal month 

 with one osseous nucleus in the centre piece, and with another at 

 the anterior (in the^zr^ os. metatars. at the posterior) extremity 

 in the second year, but only in the eighteenth year are the pieces 

 completely united together. 



108. Digiti Pedis, Toes, 



five on each foot, each consisting of three, the great toe of two 

 members, nhalan&es. 



Phalanx I. the largest. Ph. II. small and short. Ph. III. Ungual, the 

 smallest, flat. The posterior extremity, oasis, of each phalanx is even, con- 

 cave, for capitul. metatarsi, with tubercula on either side. The anterior ex- 

 tremity roller shaped, convex, with a sinus on either side ; that of the third 

 Ph. free, semilunar. 



1 . Hallux, great toe ; two members ; thick and large, less moveable than 

 the fingers, on account of its strong ligament. To the plantar surface, flexor 

 brevis, to the basis the first Phalanx. 



2. Ossa sesamoidea, for abductor and adductor hallucis; Dorsal surface of 

 first Phalanx, for m. extensor hall, brevis. To the oasts the second Phalanx 

 one os sesamoideum: Plantar surface, for flex. hall. long. Dorsal surface, for 

 extens. hall, longus. 



Second to fifth toes are always smaller. First Ph., for m. lumbricales. Se- 

 cond Ph., for flex. comm. brevis. Third Ph., 6osis, for flex. comm. long. Dor- 

 sal surface of all three, for exlens. comm. long, and brevis. 



Fifth small toe, Digitus minimus. First Ph., oasis, for flex. brev. and abduct, 

 digiti 5. 



