Joints of the Upper Extremity. 



181 



232. 



Right elbow joint, 



articulatio cubiti, 



from in front. 



The articulatio cubiti 



(elbow joint) (see also Figs. 233 

 to 237) is the articulation between 

 the humerus and the bones of 

 the forearm. Here three different 

 joints are included in one common 

 capsula articular is: - - (1) the 



(Ligameiitum 



incisura semilunaris ulnae glides 

 upon the trochlea humeri (articu- 

 latio humeroulnaris) ; (2) the 

 fovea capituli radii rotates on the 

 capitulum humeri (articulatio 

 humeroradialis); (3) the circum- 

 ferentia articularis radii moves in 

 the incisura radialis ulnae (articu- 

 latio radioulnaris proximalis). 

 The articulatio humeroulnaris 

 takes part in the movements be- 

 tween the upper arm and, the fore- 

 arm only, while the articulatio 

 radioulnaris proximalis serves ex- 

 clusively for the movements be- 

 tween the two bones of the fore- 

 arm ; the articulatio humeroradialis 

 on the other hand, takes part in 

 both movements. 



Epicondylus 

 . lateralis 

 humeri 



radiale 



Ligamentum 

 annulare -- 

 radii 



Tendo m. 

 bicipitis 



. Humerus 



Capsula 

 articularis 



Epicondylus 

 medial is humeri 



Ligamentum 



collaterale 



ulnare 



Chorda obliqua 



Radius- -- 



. Ulna 



Membrane 



interossea 

 antibrachii 



I 



