108 



LABORATORY MANUAL OF HUMAN ANATOMY 



Note the exact behavior of the tendons of the M. extensor 

 indicis proprius and the M. extensor digit! quinti proprius at 

 and near their terminations. 



Dorsal Interosseous Nerve (N. Interosseus dorsalis) (O. T. Pos- 

 terior Interosseous). 



Find the terminal filament of this nerve. To what structures 

 is it related! What joints are innervated by it? 



FIG. 40. 



M. lumbricalis 



Aponeurotic expansion on 

 ulnar side 



Tendon of M. ex- 

 tensor commu- 

 nis digitorum 



Slip to first 



phalanx 



_ Perforating 



fibres 



_ M. interosseus 



Tendons of the M. extensor communis digitorum: connections (deep surface). (From Poirjer et 

 Charpy, Trait< d'Anat. hum., Paris, 1901, 2 ed., t. ii. p. 130, Fig. 109.) 



Transverse Ligament of the Heads of the Metacarpal Bones and the 

 Interosseous Muscles. 



Place the volar surface of the hand upward and examine the 

 transverse ligament of the heads of the metacarpal bones (liga- 



