106 



METATARSAL BONES. 



Fig. 46.' 



base, corresponding with the second, and may be distinguished by its 

 smaller size. 



The fourth may be distinguished by its smaller size, and by having 

 a single articular surface on each 

 side of the base. 



The fifth is recognised by its 

 broad base, and by its large tubero- 

 sity in place of an articular surface 

 upon its outer side. 



Development. Each bone by two 

 centres ; one for the body and one 

 for the digital extremity in the four 

 outer metatarsal bones ; and one for 

 the body, the other for the base in 

 the metatarsal bone of the great toe. 

 Ossific deposition appears in these 

 bones at the same time with the 

 vertebrae ; the epiphyses, commen- 

 cing with the great toe and proceed- 

 ing to the fifth, appear towards the 

 close of the second year, consolida- 

 tion being effected at eighteen. 



Articulations.- With the tarsal 

 bones by one extremity, and with 

 the first row of phalanges by the 

 other. The number of tarsal bones 

 with which each metatarsal articu- 

 lates from within outwards, is the 

 same as between the metacarpus 

 and carpus, one for the first, three 

 for the second, one for the third, 

 two for the fourth, and one for the 

 fifth, forming the cipher 13121. 



Attachment of Muscles. To fourteen; to the first, the peronens 

 longus and first dorsal interosseous muscle ; to the second, two dorsal 

 interrossei and transversus pedis; to the third, two dorsal and one 

 plantar interosseous, adductor pollicis and transversus pedis; to the 

 fourth, two dorsal and one plantar interosseous, adductor pollicis and 



* The sole of the left foot. 1. The inner tuberosity of the os calcis. 2. The 

 outer tuberosity. x. Its posterior tuberosity. 3. The groove for the tendon of 

 the flexor longus digitorum ; this figure indicates also the sustentaculum tali. 

 4. The rounded head of the astragalus. 5. The scaphoid bone. 6. Its tube- 

 rosity. 7. The internal cuneiform bone ; its broad extremity. 8. The middle 

 cuneiform bone. Q. The external cuneiform bone. 10, 11. The cuboid bone. 

 1 1 . Refers to the groove for the tendon of the peroneus longus : the prominence 

 between this groove and figure 10 is the tuberosity. 12, 12. The metatarsal 

 bones. 13, 13. The first phalanges. 14, 14. The second phalanges of the four 

 lesser toes. 15, 15. The third, or ungual phalanges of the four lesser toes. 

 16. The last phalanx of the great toe. 



