374 



THE ANATOMY OF TllK HOUSE 



Eacli rib is ilivisiblc into a body and two extreuiitics. Tlic body lias 

 two flat surfaces and two borders ; the latter of which are concave and thin, 

 anteriorly convex, and rounded }H)sterit)rly. The head or superior extremity 

 \aries in the true and false ribs, as will be better seen by reference to the 



f^^ -. 



Fig. 21.— a True and F.m.sk Rib. 



A. Profile view nf a >eft tnie or stenial rib. 



2. Tuborrlc toi ailaohment to transverse process 



of vf^i tebra. 



3. Up«d, true. 



4. Body. 



5. Junction of rib and its corresponding sternal 



cartilage. 

 0. Strnal cartilago> 



B. Profile view of left false or asternal rib (eigh- 



teenth). 

 2. Tubercle fused in one with the head. 

 8. Head. 



4. Body. 



5. Junction of false rib and asternal cartilage. 



C. Astniial cartilage. 



C. Viewof llic upper extremity of stcriiul rib inverted 



to sliow the male by wiiicli tlie articulating 

 surfaces on the upjier part of the rib corre- 

 spond to the nine anterior dorsal vertebnc. 



1. Body. 



2. Tubercle, sejiarate. 



3. 4. Uead (true), showing the two surfaces of 



articulation, and the notch in which the 

 round lig.iiuent is attached. 



D. View of tlie hi.sta.stern:il rib, also inverted to show 



tlio fusion of tubercle and head together. 



1. Body. 



2, 3. Tubercle fused with head. 



engraving (Fig. 21), where one of each kind is delineated. The cartilages 

 are all attached to the ribs by firm union of their fibres to a deep pit in the 

 extremity of each rib. They serve the double purpose of giving elasticity 

 to the thorax in the act of respiration and of enabling it to bear severe 

 shocks without fracture. 



Among the several rib.s, the first is the thickest and shortest, and is 

 irregularly arched ; the second is very slight!}- cui-ved : from this point they 



