434 iNiaoDUCTORY. 



Most of the generic and specific distinctions in the mam- 

 malia are founded on the teeth, together with the size and 

 shape, &c. of the bones of the animal skeleton. It must, there- 

 fore, be apparent, that to understand these, a knowledge of the 

 various principal bones of which the skeleton is composed be- 

 comes absolutely necessary. Man being the most perfect of 

 vertebrate animals, his skeleton contains all the parts which 

 exist in other animals, which have vertebrae. It is the province 

 of the comparative anatomist and zoologist to examine and com. 

 pare these, as they exist in the various species, and upon his 

 anatomical skill will depend the success of his investigations. 

 We, therefore, give a view of the 



HUMAN SKELETON.— Plate I 



BONES OF THE TRUNK. 



A. The sternum. 



B. The seventh, or last true rib. 



C. The cartilage of the ribs. 



D. The twelfth, or false rib. 



E. The lumber vertebr<E, with their intervertebral cartilages, 



and transverse processes. 



F. The OS sacrum. 



G. The OS innominatum, composed of 



The OS ilium, a. 

 Tlie OS pubis, b. 

 The OS ischium, c. 



BONES OF THE SUPERIOR EXTREMITY. 



H. The clavicle. 



I. Inner surface of the scapula. 



1. The acromion of the scapula. 



"2. The coracoid process of the bone. 



K. The OS humeri. 



3. The head, or ball of the os humeri. 



4. Internal tubercle of the os humeri ; and, farther out, (Ik; 



groove for lodging the tendon of the long head of the 



biceps muscle. 

 .'i. The inner, and 

 6. The outer condyle of the os humeri. Between 5 and 6, 



the hollow for lodging the coronoid process of the ulna 



in the flexion of the fore arm. 



