34 INTRODUCTION 



DIVISION OF THE CADAVER INTO PAETS. 



The number of men assigned to a given cadaver and the part 

 that each will dissect will vary in different laboratories, partly 

 according to the supply of material, partly according to the par- 

 ticular plan favored by the instructor. Very satisfactory 

 methods of division have been agreed upon, among others the 

 following : 



A. For ten students to a cadaver, five on each side. 



1. Arm and wall of thorax (extremitas superior). 



2. Lower extremity (extremitas inferior). 



3. Head, neck, and dorsum of trunk (caput, collum, et dorsum 



trunci). 



4. Thorax. 



5. Abdomen and pelvis (abdomen et pelvis). 



B. For six students to a cadaver, three on each side. 



1. Arm and wall of thorax (extremitas superior). 



2. Lower extremity, abdomen, and pelvis (extremitas inferior, ab- 



domen, et pelvis). 



3. Head, neck, and upper part of trunk (caput, collum, dorsum 



trunci, et thorax). 



C. For four students to a cadaver, two on each side. 



1. Upper half of body (caput, collum, dorsum trunci, thorax, et 



extremitas superior). 



2. Lower half of body (extremitas inferior, abdomen, et pelvis). 



ANATOMICAL TEEMS INDICATING THE POSITION 

 AND DIRECTION OF PAETS OF THE BODY. 



In descriptive anatomy certain technical terms, derived 

 chiefly from the Latin and Greek, are necessary for the desig- 

 nation of parts of the body and for specifying exactly their 

 spatial relations. 



In descriptions the human body is usually thought of as 

 standing upright, with the arms hanging at the sides, i.e., alive ; 

 the older anatomists always represented the volar surface of 

 the forearm and the palm as looking forward, but at present no 

 definite position in space is ascribed to the forearm. The body, 

 so nearly symmetrical, is thought of as being halve'd by a per- 

 pendicular plane, the so-called median (medianus) plane, into a 

 right and a left half. The direction towards this median plane 

 is designated as medial (medialis) ; that away from it, lateral 

 (lateralis). By a vertical direction (verticalis) is meant one 

 corresponding to the long axis of the median plane; a plane or 

 line at right angles to the median plane, if it be parallel to the 



