A manual of anatomy . ctor pollicis longus (insertions)(four). Second Metacarpal.—First and second dorsal interossei, first palmar interos-seous, adductor pollicis (origins); flexor carpi radialis, extensor carpi radiaUslongus (insertions) (six). Third Metacarpal.—Second and third dorsal interossei, adductor pollicistransversus and obhquus (origins); extensor carpi radialis brevis, flexor carpiradiahs (insertions) (six). Fourth Metacarpal.—Third and fourth dorsal interossei and second palmarinterosseous (origins) (three). Fifth Metacarpal.—Extensor carpi ulnaris, flexor carpi ulnaris, opponens
A manual of anatomy . ctor pollicis longus (insertions)(four). Second Metacarpal.—First and second dorsal interossei, first palmar interos-seous, adductor pollicis (origins); flexor carpi radialis, extensor carpi radiaUslongus (insertions) (six). Third Metacarpal.—Second and third dorsal interossei, adductor pollicistransversus and obhquus (origins); extensor carpi radialis brevis, flexor carpiradiahs (insertions) (six). Fourth Metacarpal.—Third and fourth dorsal interossei and second palmarinterosseous (origins) (three). Fifth Metacarpal.—Extensor carpi ulnaris, flexor carpi ulnaris, opponensquinti digiti (insertions) (three). THE PHALANGES (PHALANGES DIGITORUM MAITOS) The phalanges are fourteen in number, three for each finger andtwo for the thumb. The first, or proximal phalanges, are thelongest and the distal are the smallest. The proximal end of eachfirst phalanx is rather large and bears a concave articular facet forthe head of the metacarpal bone. The shaft is somewhat flattened 88 OSTEOLOGV. THE PELVIC APPENDAGES 89 and presents a smooth convex dorsal surface; the ventral surface issmooth and concave for the accommodation of the flexor head bears a convex articular facet for the second second phalanges resembles the first generally. The proxhnalfacet, however, is convex. The third phalanges are the smallest andshortest. The proximal extremity is large and its articular surfaceis convex. Its distal extremity is flattened for the support of thenail. Nutrient Foramina.—Tliere are usually iwo nutrient foramina for each phalanx,distally directed and upon the ventral, or palmar surface. Ossification.—These are of endochondral origin and each is developed fromtwo centers. The center for the shaft and distal extremity appears during the ninthto the tenth week of fetal life and that for the proximal extremity during the thirdyear. According to Pryor most of these centers appear between the first andearly part of the third years. Fu
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthumananatomy, bookyea
