174 



THE SKELETOX 



glenoid fo^sa for the convex head of tlie coiTesi)onding metatarsal, whilst the head 

 has a trochlear surface for the second })halanx. , 



The phalancres of the second row are stunted, msignificant hones. 1 hen- 

 shaft^ are Hatter than those of the lirst row, l)esides heing much shorter. The 

 bases have two depressions, separated by a vertical ridge. The heads present 

 trochlear surfaces for tlie ungual ]ihalanges. .in.ii 



Thr third, terminal, or ungual i)lialanges are easily recognised. Ihe bases 

 articulate with the second phalanges; the shafts are expanded to support the nails, 

 and their plantar surfaces are rough where they come into relation with the pulp 

 of the digit. 



Fig. 190.— Thk Secoxdary Ossific Centres of the Foot. 



the centre for the epiphysis for the calca- 

 neum appears at the tenth year; consoli- 

 dates at the sixteenth year 



THE CENTRE FOR THE EPIPHYSIS FOR THE META- 

 TARSAL OF THE HALLUX APPEARS AT THE THIRD 

 YEAR; CONSOLIDATES AT THE TWENTIETH YEAR 



THE CENTRES FOR THE BASE OF THE TERMINAL 

 PHAUNGES APPEAR AT SIXTH YEAR; AND CON- 

 SOLIDATE AT THE EIGHTEENTH YEAR 



THE CENTRES FOR THE HEADS OF THE METATARSALS 

 APPEAR AT THE THIRD YEAR; AND CONSOLIDATE AT THE TWENTIETH YEAR 



The first phalanx of the hallux gives insertion to the following muscles: — 

 Flexor brevis hallucis; abductor ludlucis; transversus pedis; adductor hallucis; 

 extensor brevis digitorum. 



The first phalanx of second toe : The first and second dorsal interosseous. 



The first phalanx of third toe : Third dorsal interosseous; first plantar inter- 

 osseous. 



The first phalanx of fourth toe : Second ])lantar interosseous; fourth dorsal 

 interosseous. 



The first phalanx of fifth toe : Third ])lantar interosseous; flexor Imwis 

 minimi tligiti; and abductor minimi digiti. 



The second phalanx of hallux: F]<'X()r longus hallucis; extensor ])roprius 

 hallucis. 



The second phalanges of the remaining toes: Extensor longus digitorum; 

 flexor brevis digitorum. 



