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DEMONSTRATIONS OF ANATOMY. 



DISSECTION OF THE UPPER LIMB. 



CHAPTER I. 



DISSECTION OF THE BACK. 



GENERAL DIRECTIONS. The student begins his work in practical 

 anatomy by the dissection either of the upper or of the lower limb. 

 During the first three days that the subject is in the dissecting-room 

 it is placed in the lithotomy position for the dissection of the 

 perineum by the workers on the abdomen. On the fourth day 

 the student begins the dissection of the back or of the buttock, 

 according as to whether he has been allotted an upper or a lower 

 limb. 



In removal of the skin the edge of the knife should be kept How to 

 directed towards it so as to remove the skin, and no more. The thTskhi. 

 underlying tissue, consisting of the superficial fascia and containing 

 the cutaneous nerves and bloodvessels and a variable amount 

 of fat, is to be left behind. Therein the operations of dissection 

 are the reverse of those of surgery, for the surgeon, in making 

 a flap, is careful to remove a considerable amount of the subjacent 

 tissues along with the skin so as to preserve its blood and nerve 

 supply. 



DISSECTION OF THE BACK. The dissection of the back is under- Time for 

 taken conjointly by the dissectors of the head and of the upper 

 limbs, the former preparing the neck, the latter making ready the 

 dorsal and lumbar regions. Two days are allowed to the dissector 

 of the upper limb ; in which time he will examine the first two 

 layers of the muscles of the back and the associated vessels and 

 nerves. 



POSITION OF THE BODY. The body lies with the face down- 

 wards. The trunk is raised by blocks placed beneath the chest 

 and the pelvis, so that the limbs hang over the end and sides of the 



D.A. B 



