346 



PRACTICAL ANATOMY. 



plialangeal articulation ; (13) the phalangcal articulations; (14) the clefts of tlic 

 fingers ; (15) the thcnar and JiypotJicnar eminences. 



Incisions. (i) From the acromion process to the end of the middle finger ; 

 (2) from the outer one-third of the clavicle to the acromion process, thence along 

 the scapular spine ; (3) from one condyle to the other. 



Dissection (Figs. 241 and 242). Carefully remove the skin and find the : 



1 . Radial nerve distributed to three and one-half fingers dorsally. 



2. Ulnar dorsal branch to one and one-half fingers dorsally. 



3. External cutaneous, a branch of the musculo-spiral nerve. 



4. Internal cutaneous nerve from the inner cord of the brachial plexus. 



INTERNAL 

 CUTANEOUS OF 

 MUSCULO- 

 SPIRAL 



INTERS A L 

 CUTANEOUS 



PALMAR 



CUTANEOUS OF 



MEDIAN 

 PALMAR 



CUTANEOUS OF 



ULNAR 



SUPRA- 



ACROMfAL 



CIRCUMFLEX 



TWIG OF 

 INTERNAL 



CUTANEOUS 



EXTERNAL 

 CUTANEOUS OF 



MUSCULO- 



SPIRAL 



SUPRA- 



ACROMIAL 



FLEX 



MUSCULO- 

 CUTANEOUS 



EXTERNAL 

 CUTANEOUS 



OF 



MUSCULO- 

 SPIRAL 



MUSCULO- 

 CUTANEOCii 



RADIAL 



PALMAR 



CI'TANEOUS 

 OF RADIAL 



FIG. 241. DISTRIBUTION OK CUTANEOUS NK.KVKS ON TIIK ANTKRIOR AND POSTERIOR ASPECTS 



OF THE SUPERIOR EXTRKMITV. 



5. Lesser internal cutaneous or the nerve of Wrisberg. 



6. Internal cutaneous nerve, a branch of musculo-spiral. 



7. Cutaneous branches of the circumflex nerve to skin of deltoid. 



8. Supraacromial, a descending branch of the cervical plexus. 



9. Intercosto-humeral nerve the lateral cutaneous branch of the second 

 intercostal nerve. 



General directions only can be give 

 (i) Keep close to the skin when you 



Mar- in ally, you will see the name of the nerve, which, having found, take your 

 forceps and search in the superficial fasdu of the region until you find the nerve. 



for doing this cutaneous dissection : 

 remove it. (2) Consult the figures. 



