ARTICULATIONS OF THE ANTERIOR LIMH*. 



145 



internal glcuoid cavity, both 

 i-iulius; 3, A middle ridgo re- 

 sponding to the middle groove 

 of the humcrus, separating the 

 two preceding surfaces, and 

 prolonged on the ulnar beak, 

 uhcro it forms the sygmoid 

 notch. This ridgo shows a 

 small synovia! fossetto hol- 

 lowed out on the radius and 

 ulna. 



Mode of union, Three 

 ligaments : two lateral and an 

 anterior. 



a. The external lateral H'/u- 

 ment (Fig. 85, 8) is a thick, 

 short, and strong funicle, at- 

 tached above to the crest limit- 

 ing outwardly and posteriorly 

 the furrow of torsion, and in 

 the small cavity placed at the 

 < -xtrnial side of the humeral 

 articular surface. Below, it is 

 inserted into the supero-ex- 

 ternal tuberosity of the radius. 

 Its anterior border is con- 

 founded with the capsular liga- 

 ment, and is margined by the 

 principal extensor of the pha- 

 langes, which derives from it 

 numerous points of attach- 

 ment. By its posterior border 

 it is in contact with the ex- 

 ternal flexor of the metacarpus. 

 Its internal face is lined by 

 sy no vial membrane, and its 

 external face is only separated 

 from the skin by the anti- 

 brachial aponeurosis and some 

 of the fasciculi from the origin 

 of the lateral extensor muscle 

 of the phalanges. Its super- 

 ficial fibres are vertical, and arc 

 continuous, behind, with tho 



in ligamentous bands 

 which stretch from tho ulna to 

 th.- radius. Its deep fibres are 

 slightly oblique downwards 

 and forwards. 



b. The lateral internal liga- 

 iiii nl. also funicular, is longer, 

 Inn not BO strong as tho prc- 

 cling. It arises from tho 



excavated, on tho superior extremity of the 

 Fig. 85. 



SCAPULO-HUMl.KW AM' Hl'MERO-RADIAL ARTICU- 

 LATIONS, WITi* ; THE MUSCLES SURROUJJDIXO THEM 



(IAII KSAI. l v i ). 



1, Scapulo-humerul capsular ligament ; '2, Short ab- 

 ductor muscle of the arm ; 3, Its insertion in the 

 hminTiis; 4, Insertion of the auhspinous IHUM ! 

 on the crest of the great tuberosity ; 5, Ooi-.u-o- 

 ni'lial muscle; 6, Its tendon of origin attached to 

 the coracoid process; 7, Its radial insertion con- 

 founded with the anterior ligament of the tilu.ir 

 articulation ; 8, 8, External lateral ligament of that 

 articulation; 9, Anterior ligament; 10, Aconeus, or 

 small extensor of tin- ion-arm; 11, Origin of the 

 external flexor muscle of the metacarpus ; 12, Short 

 flexor muscle of the fore-arm. A, Tuberosity of 

 the scapular spine. B, Superspinous fossa. c. Sul>- 

 spinous fossa. 1>, Coim-uty of the small trochan- 

 ter. K, Summit of tlio tro.-hantcr. 



small tuberosity on the inuor side of thu 



L 



