184 



Joints of the Upper Extremity. 



Humerus 



Capsula articularis 



; Epicondylus medialis 



Ligamentum collaterale ulnare 



'Epicondylus lateralis 



Olecranon 



235. Right elbow joint, articulatio cubiti, 



from behind. 

 (The forearm is flexed at a right angle on the upper arm.) 



The capsula articularis of the articulatio cuMti reaches on the upper arm 

 behind, in the middle as far as the upper part of the fossa olecrani, on the sides as 

 far as the lower part of the epicondylus medialis and lateralis. Especial strengthening 

 ligaments in the posterior wall of the fibrous capsule will not be described. The upper 

 part of the fossa olecrani contains a thick mass of fat close to the capsule between it 

 and the tendon of the m. triceps brachii. 



