THORACIC LIMBS 555 



and below by the internal and inferior surfaces. It is flat, and faces 

 forward and inward. It has no muscular attachments. 



The posterior surface (Fig. 431) is the continuation of the posterior 

 surface of the shaft downward and inward below the supracondyloid 

 foramen, round the olecranon fossa and the inner end of the posterior 

 articular surface. It is smooth and almost straight from above down- 

 ward, except on the inner side of its termination below, where it is 

 slightly convex. It is gently convex from side to side. It is free from 

 muscular attachment. 



The internal surface (Fig. 429) is a small roughened area at the 

 meeting of the posterior, anterior, and inferior surfaces. Its long axis 

 is directed downward and backward. It faces inward and downward. 

 This surface and the inferior surface give attachment to a number of 

 muscles, but the facets for their attachment are not always clearly 

 marked. Its superior point presents the greatest elevation of the 

 condyle from the articular mass. It is a small, rounded projection, 

 to which is attached the origin of the pronator radii teres. Below this 

 prominence is a transverse depression for some of the fibres of the 

 internal lateral ligament. Below this again is a crescentic facet for the 

 attachment of the flexor carpi radialis and one part of the flexor 

 profundus digitorum. Behind this facet, often separated from it by a 

 sharp line, is another larger crescentic facet for the palmaris longus. 



The inferior surface (Fig. 432) is a narrow strip lying between the 

 side of the articular mass and the internal surface, and below the 



FIG. 432. 



Trnchlea Cap-Helium 



with Vina. with Kadins. 



External Lateral Ligament. 



-EXTENSOR MINIMI DIGITI. 

 _SUPINATOR BREVIS. 



Internal Lateral Ligament. j^/^lWIlti '--^ -"' -EXTENSOR CARPI ULNARIS 



PRONATOR TERES. ^X^ liSMS^IAuJ SV. "\ 3 ANCONEUS. 



FLEXOR CARPI RADIALIS-- 



FLEXOR PROFUNDUS DIGITORUM. - 



PALMARIS LONGUS.- 



Outer Condyle. 



CARP| ULNARIS. FLEXOR PROFUNDUS DIGITORUM. 



LEFT HUMERUS, DISTAL END. 



anterior surface ; its plane is almost at right angles with these parts, 

 facing downward, forward, and slightly outward. Its lower boundary 

 forms a sharp edge with the lower boundary of the posterior surface ; 

 it forms, above, a slight angle with the anterior surface. Its long axis 



