110 ANATOMY IX A NUTSHELL. 



For the fourth metacarpal bone the nutrient artery is furnished by the 

 second interosseous; it enters on radial side of shaft, and is directed towards 

 the proximal end. 



For the fifth metacarpal bone the nutrient artery is derived from the 

 third interosseous; it enters the shaft on the radial side, and is directed to- 

 wards the proximal end. (Plate VI 1 . page 33.) 



LESSON XXVIII. 



The first phalanx of the thumb articulates with two bones, the metacarpal 

 of the thumb proximally, and the second phalanx distally. It has five muscles 

 attached, the Al idiictor pollicis, Adductor obliquus, Adductor transversus 

 pollicis. Extensor brevis pollicis. and the Flexor brevis pollicis. The second, 

 or Last phalanx of the thumb articulates with one bone, the first phalanx of the 

 thumb. It has two muscles attached, the Extensor longus pollicis and the 

 flexor longus pollicis. 



The first phalanx of the index finger articulates with two bones the second 

 metacarpal proximally. and the second phalanx of the index finger distally. It 

 has two muscles attached, the First dorsal interosseous, and the First palmar in- 

 terosseous. The second phalanx of the index finger articulates with two bones, 

 the first phalanx proximally, and the third phalanx distally. It has three 

 muscles attached, the Extensor communis digitorum Extensor indicis. and the 

 flexor sublimis digitorum. The last phalanx of the index finger articulates 

 with one bone, the second phalanx proximally. It has three muscles attached, 

 the Extensor communis digitorum, Extensor indicis. and Flexor profundus 

 digitorum. The first phalanx of the middle finger articulates with two hones, 

 the metacarpal of the middle finger proximally. and the second phalanx of the 

 middle finger distally. It has two muscles attached, the Second and Third 

 dorsal interossei. The second phalanx of the middle finger articulates with 

 two bones, the first phalanx proximally. and the third phalanx distally. In has 

 two muscles attached, the Extensor communis digitorum and Flexor sublimis 

 digitorum. The third phalanx articulates with one hone, the second phalanx 

 proximally. It has two muscles attached, the Extensor communis digitorum 

 and flexor profundus digitorum. 



The lir>t phalanx of the ring finger articulates with two bones, the fourth 

 metacarpal proximally. and the second phalanx of the ring finger distally. It 

 ha- two muscles attached, the Fourthdorsal interosseous and the Third palmar 

 interosseous. The second phalanx of the ring finger articulates with two bones. 

 the first phalanx of the ring finger proximally, and the third phalanx distally. 

 It has two muscles attached, the Extensor communis digitorum and Flexor 

 sublimis digitorum. The third phalanx of the ring finger articulates with one 

 hone, the second phalanx proximally. and has two muscles attached, the Ex- 

 tensor communis digitorum ami flexor profundus digitorum. 



The first phalanx of the little finger articulates with two bones, the fifth 

 metacarpal proximally. and the second phalanx of the little finger distally. It 

 ha- three muscles attached, the Extensorbrevis minimi dieiti, Abductor minimi 



