CHAPTER III. 

 DISSECTION OF THE LOWER LIMB. 



SECTION I. 

 THE BUTTOCK OR THE GLUTEAL REGION. 



Both this SECTION and the following one are to be Directions. 

 ompleted by the student in the four days appointed for the 

 ody to lie in the prone position, and the student who is com- 

 uencing his work in practical anatomy by the dissection of the 

 uwer limb should read the general directions for the beginner 

 ni p. 1 before proceeding with this section. 



Position. During the dissection of the back of the thigh the Position of 

 >ody is placed with the face down and the pelvis is to be well the body> 

 aised by blocks. 



Surface marking. At the upper part of the buttock, by Surface- 

 xercising deep pressure, the student will make out the crest of m 

 he iliac bone, and on tracing this inwards the posterior superior 

 liac spine will be felt opposite the second sacral spine ; and 

 his part marks the middle of the sacro-iliac joint. Internally 

 he lower part of the sacrum and the coccyx will be found at the 

 bottom of the natal furrow. Inferiorly, the thick fold of the nates 

 i< Yriv evident, and above this the mass of the glutens maximus 

 muscle contributes largely to the prominence of the buttock. 

 About three or four inches below the anterior part of the iliac 

 ( i*->t on the outer side of the thigh is the great trochanter of the 

 femur, and by pressing upwards beneath the inner part of the fold 

 of the nates the tuberosity of the ischium can be felt. A line 

 (Nelaton's) drawn from the anterior superior iliac spine to the 

 most prominent part of the ischial tuberosity passes just over the 

 highest part of the great trochanter and is used in surgery for 

 ascertaining the degree of displacement of that part of the bone 

 in various conditions. 



Dissection. The integument is to be raised from the buttock Take tip the 

 by means of the following incisions (fig. 1, A, p. 3) One is to be 

 made along the whole length of the iliac crest, and continued in 

 the middle line of the sacrum to the tip of the coccyx (G). Another 

 is to be begun where the first terminates, and is to be carried out- 

 wards and downwards across the thigh, ending about six inches 



