1-j ./:\ /:/;. i/. ritixri //./> .t/'/'/./r.i/;/./: ro 



The tliarthroiliiil r;/i ///<; are voluminous :uid smooth, and in u fresh 

 State are eo\ ( red \\itli eartihige. They arc named heads and eondyl< s : 

 head*, when they describe the segment of u sphere (head of the femur, head 

 of the humerus) ; condylea, whoa they repns- nt tho segment of an oval 

 figure, cut parallel to its large axis (condylen of tho femur.) 



The non-articular eminences receive various names. If they are volumi- 

 nous and much detached from the bone, they are called //"< --,... ,,] ,,^,,j,l,i/s,x. 

 Apophyses receive qualificatives derived from the analogies perceived In t 

 them and known objects. (Examples: the styloid, clinoid, eonmoid and 

 coracoid processes.) Tho appellations of protuberances and M/< /W//V* 

 ore given to non-articular eminences when they are large and round, and 

 but slightly prominent. Lastly, they are named lines, crests, and /</;/< .--, 

 when they are narrow and very long. 



Cavities. The cavities of bones have also been divided into articular and 

 non-articular cavities. 



The first correspond to the eminences of the same name in the bony 

 joints. They take tho designation of cotyloid cavities when they are deeply 

 excavated, like a basin or the cup of an acorn (tho glenoid cavity of the 

 scapula, and the cotyloid cavity of the coxa). 



The non-articular cavities servo cither for ligamentous or muscular 

 implantation, or for the passage of vessels, nerves, tendons, etc. 



They are termed channels or furrows, when they are wide, deep, and 

 smooth; grooves, when they are long, narrow, and even at the bottom; 

 fissures, when they are narrow and rough. Digital impressions is the name 

 given to those excavations in bones which look as if produced by the 

 pressure of the finger. Tho fosscv, sinuses, cells, and notcJies are also non- 

 articular cavities of bones. The sinuses and cells are formed by ojxm 

 spaces in the interior of bones ; notches, by cavities excavated on their 

 margins. 



When a cavity passes quite through a bone it is termed & foramen. If 

 this foramen offers a certain length, it is then designated a conduit or cmm/. 

 Fissures arc long, narrow foramina; Itiatus is the term applied to wide 

 openings with irregular outlines. 



REGIONS OP THE BONES. When it is desired to describe the eminences 

 and external cavities of a bone, it is essential not to notice them, as it were, 

 by chance passing indifferently from one to another. In order to avoid 

 the difficulties which would result from the application of such an irrational 

 system, it is convenient to divide the bone to bo described into several 

 regions, in which are examined, one after another, all tho external peculiari- 

 ties that may offer. 



The following is tho course to pursue in order to establish the regions 

 of a long, a flat, and a short bone. 



(a) A long bone is always divided into three parts : a body and two 

 extremities. The body, middle part, or diapkyxitt, is the narrowest portion of 

 tho bone. It represents a geometrical solid, approaching more or less the 

 figure of a very elongated prism. In a long bone, therefore, it is necessary 

 to study as many faces, angles, or borders, as the prism it lepresents may 

 offer. 



With regard to tho extremities, or epiphyses, these are more or l.-s< < . n - 

 siderable enlargements, showing articular surfaces, as well as surfaces 

 intended for muscular or liganientons insert ion. 



('6) A flat bone must necessarily have two /,i,-at, as well as b>-<li ,-* and 



