THE SKELETON OF THE UPPER EXTREMITY 



123 



Unciform bone . 

 Os hamatum 



Os magnum, 

 or capitate 

 bone 



Os capitatum 



FIG. 299. IN THE SECOND YEAR 

 OF LIFE. 



lunar (or semilunar) bone 

 Os lunatum 



Pyramidal or 

 cuneiform bone x. 

 Os triquetrum 



Unciform bone, 

 Os hamatum 



Os magnum, or capitate bone 

 / Os capitatum 



Scaphoid bone 



Os naviculare 



Trapezium 



Os multangulum 

 majus 



FIG. 300. IN THE SEVENTH YEAR 

 OF LIFE. 



CENTRES OF OSSIFICATION OF THE CARPUS (SECTIONS PARALLEL TO THE POSTERIOR SURFACE). 



Centre of ossification in 



the head of the meta- 



carpal bone 



Centres of ossification 



in the proximal 



extremities of the 



phalanges 



Epiphysis of the head of 

 the metacarpal bone 



\ 



\ 



Vi 



FIG. 301. MIDDLE. FINGER IN THE 

 SECOND YEAR OF LIFE. 



\ Epiphyses of the 

 --; proximal extremities 

 of the phalanges 



Centre of ossification in 

 the base of the meta- 

 carpal bone of the 

 thumb 



Centres ol'ossification 



in the proximal 



extremities of the 



phalanges 



*^ 



FIG. 302. MIDDLE FINGER IN THE 

 SEVENTH YEAR OF LIFE. 



Epiphysis of the hsad 

 of the metacarpal bone 



r'-iV "" :2i Epiphysis of the proxi- 

 mal extremity of the 

 metacarpal phalanx 



Epiphysis of the proximal 



extremity in the act of 



uniting with the shaft 



Epiphysis of the proxi- 

 mal extremity of the 

 medial phalanx 



FIG. 304. BONES OF 

 THE THUMB IN THE 

 FOURTH YEAR OF 

 LIFE. 



FIG. 305. METACARPAL 

 BONE OF THE THUMB 

 IN THE EIGHTEENTH 

 YEAR OF LIFE. 



Epiphysis of the proximal 

 extremity of the ungual 

 phalanx 



. 33- EPIPHYSES OF THE BONES 

 OF THE MIDDLE FINGER IN THE 



ACT OF UNITING WITH THE SHAFTS : 



SEVENTEENTH YEAR OF LIFE. 



Development of the Bones of the Hand. 



16 2 



