346 



PR A CT1CAL ANA TO MY. 



phalangcal articulation ; (13) the plialaiigcal articulations; ( 14) the clefts of the 

 fingers ; ( I 5) the tlicnar and livpotlicnar 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 coiulyle 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. 



1XTBSXAL 



CCT. \XKOVS OF 

 UUSCULO- 

 SPIRAL 



IXTKRffAL 

 IT T A. \EOl'!i 



PALMAR 



rrTANEOUS OF 



MEDIAN 

 PALMAR 



CUTANEOUS OF 



VLXAR 



- SUP R.I - 



ACHOMIAL 



CIRCUMFLEX 



IXTKRI'OSTO- 

 Hi'MKRAL 



CIKCUK- 



TWIG OF FLEX 



IXTKRXAL 

 CCTAXEOUS 



KXTKKXAL 

 CCTAXKOrS OF 



Mt'.TI'I.'J- 



SPIKAL 



PALMAR 

 ITTAXEOUS 

 OF RADIAL 



SUPRA- 



ACHOMIAL 



EXTKRXAJ, 

 IT/ I 



OF 



MDSCCLfl- 

 CVTAXKOL'S 



ISTERXAL 

 VI'TAXKOUS OF 



MI'xrrLO- 



SPIRAL 



i.\ m;i-r>HTO- 

 Hl'M , 



xri;vi-: in' 

 H'lHSUEHG 



INTER XM. 

 CUTANEOVa 



RADIAL 



ULNAR 



FIG. 241. DISTRIBUTION OF CUTANEOUS NERVES UN THE ANTERIOR AND POSTERIOR ASPECTS 



OF THE SUPERIOR EXTREMITY. 



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 given for doing this cutaneous dissection : 

 (i) Keep close to the skin when you remove it. (2) Consult the figures. 

 Marginally, you will see the name of the nerve, which, having found, take your 

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



