110 



LABORATORY MANUAL OF HUMAN ANATOMY 



of action may be made out. It may then be cut away also. What 

 bones are concerned in the formation of the elbow- joint? Note 

 that the articulatio cubiti really includes three articulations : 



(a) Humero-ulnar articulation (articulatio humero-ulnaris) ; 



(b) Humeroradial articulation (articulatio humeroradialis) ; 



(c) Proximal radio-ulnar articulation (articulatio radio-ulnaris proxi- 



malis ) . 

 Joints (a) and (b) are studied at this stage; joint (c), a little later. 



FIG. 42. 



Lig. 

 coll. 

 uln. 



Capsula articularis 

 (anterior part) 



Humerqcoronoid 

 fascicle 



.Olecranohumeral 

 fascicle 



Ol ecranocoronoid 

 fascicle (Cooper's 

 ligament) 



Articulatio cubiti. (From Poirier et Charpy, Traite" d'Anat. hum., Paris, 1899, 2 ed., t. i. p. 641, 



Fig. 650.) 



Study carefully the form, position, and attachments of each 

 of the following ligaments : 



(a) Joint-capsule (capsula articularis). 



(aa) Ulnar collateral ligament (ligamentum collaterale ulnare) (0. 



T. internal lateral ligament). 



(ab) Radial collateral ligament (ligamentum collaterale radiale) 



(0. T. external lateral ligament). 



Make a transverse cut across the anterior surface of the cap- 

 sula articularis so as to open the joint. Examine the extent of 

 the synovial membrane. Note the continuity of the cavities of 

 the humero-ulnar and humeroradial articulations with that of 

 the proximal radio-ulnar articulation, all forming one joint- 

 cavity, that of the articulatio cubiti. (See Fig. 43.) 



