THE HUMERUS 89 
inserted into a triangular rough area below the anterior part. The medial tuber- 
osity (Tuberositas medialis) is less salient, and consists of anterior and posterior 
parts; the anterior part forms the medial boundary of the intertuberal groove, 
and furnishes insertion to the medial branch of the supraspinatus above, and the 
posterior deep pectoral muscle below; the posterior part gives attachment to the 
subscapularis muscle. The intertuberal or bicipital groove (Sulcus intertuberalis)! 
is situated in front; it is bounded by the anterior parts of the tuberosities, and is 
subdivided by an intermediate ridge.- The groove is covered in the fresh state by 
Intertuberal Intertuberal 
(or bicipital) Lateral (or bictpital) 
groove tuberosity groove 
Medial 
tuber- 
osity 
Lateral 
tuberosity 
Deltoid 
tuberosity Deltoid 
’ Teres 
tuberosity 
tuber- 
osity 
Musculo- 
Lateral spiral 
condyloid groove Nutrient 
crest Lateral foramen 
Coronoid condyloid 
fossa crest Coronoid 
: Lateral fossa 
ita epicondyle | Medial 
y epicondyle 
Medial 
Lateral ; epicondyle 
condyle Olecra- Medial 
Lateral non fossa Lateral 
: condyle 
epicondyle condyle 
Fie. 63.—Lerr Humervs or Horse; Lateray View. Fic. 64.—RicaHt Humerus or Horse; Front VIEew. 
1, Rough area to which tendon of infraspinatus is 1, Rough area for attachment of extensor carpi 
attached; 2, crest; 3, depression for attachment of radialis and extensor digitalis communis; 2, synovial 
Jateral ligament. fossa. 
cartilage, and lodges the tendon of origin of the biceps brachii muscle. Just below 
the intermediate ridge is a small fossa in which several foramina open. 
The distal extremity has an oblique surface for articulation with the radius 
and ulna, which consists of two condyles of very unequal size, separated by a ridge. 
The medial condyle (Condylus medialis) is much the larger, and is crossed by a 
sagittal groove, on the anterior part of which there is usually a synovial fossa. Pos- 
teriorly the groove extends upward considerably above the rest of the articular 
surface and reaches the olecranon fossa, and this part articulates with the semilunar 
1The name “intertuberal’’ is designative of the position of the groove. while the term 
“bicipital” has reference to its occupation by the tendon of the biceps brachii. The term ‘sulcus 
intertubercularis” is also in common use. 
