THE ARTICULATIONS IN GENERAL 



167 



Lateral ligament 



Lig. collaterale 



Capsule of the joint 



Capsula articularis 



Axis of adduction and abduction 



Centre of the head (axis 



of flexion of the metacarpo- 



phalangeal articulation) 



Second metacarpal bone 

 Os metacar ale II. 



V, 



FlG. 387. CONDYLARTHROSIS, OR CoNDYLOID JOINT. (THE METACARPO-PHALANGEAL ARTICULATION 



OF THE INDEX-FINGER; LATERAL VlEW.) 



Point of intersection of the frontal axes of the 

 occipital condyles (the axis of flexion and 

 extension, or nodding movement, of the head) 



, Sagittal axis of the occipito-atlantal articulation 

 (axis of lateral flexion of the head) 



, _Basilar portion of the occipital 

 T~ bone 



Pars basilaris ossis occipitalis 



^.Capsule of the joint 

 Capsula articularis 



Occipital condyle 



'Condylus occipitalis 



.^Superior articular surface of the atlas 

 Fovea articularis superior atlantis 



Lateral mass of the atlas 



Massa lateralis atlantis 



FIG. 388. CONDYLARTHROSIS, OR CONDYLOID JOINT. (RIGHT OCCIPITO-ATLANTAL ARTICULATION ; 



SEEN FROM THE OUTER SlDE.) 



The outer half of the lateral mass of the atlas has been removed by a sagittal section passing through 



the joint. 



Anteroposterior axis (axis of adduction and abduction) 



Badio-ulnar axis (axis of flexion 

 and extension) 



Trapezium 



Os multangulum majus 



First metacarpal bone x 

 Os metacarpale I. 



V, 



FIG. 389. ARTICULATIO SELLARIS SADDLE JOINT. (ARTICULATIO CARPOMETACARPEA POLLICIS- 



CARPOMETACARPAL JOINT OF THE THUMB.) 



Diarthrosis, or Discontinuous Articulation Articulatio simplex, simple joint. 



