. Cunningham's Text-book of anatomy. Anatomy. Olecranon fossa Groove foe ulnar nerve Fig. 199.—Distal Aspect of the Distal Ex-,4 tremitt of the humerus. The posterior surface of the distal half of the shaft is smooth and rounded from side to side; somewhat flattened distally, where the whole shaft tends to incline forwards, it be- comes continuous on either side with the posterior surfaces of the epicondyles, the medial of which is grooved for the passage of the ulnar nerve, whilst the lateral supplies an origin for the an- coneus muscle. The medial head of the triceps muscle has an ext
. Cunningham's Text-book of anatomy. Anatomy. Olecranon fossa Groove foe ulnar nerve Fig. 199.—Distal Aspect of the Distal Ex-,4 tremitt of the humerus. The posterior surface of the distal half of the shaft is smooth and rounded from side to side; somewhat flattened distally, where the whole shaft tends to incline forwards, it be- comes continuous on either side with the posterior surfaces of the epicondyles, the medial of which is grooved for the passage of the ulnar nerve, whilst the lateral supplies an origin for the an- coneus muscle. The medial head of the triceps muscle has an exten- sive attachment from the posterior Fig. 19S.—Proximal Aspect of the Head of the Eight surface of the distal two-thirds of Humerus (with the outline of the distal extremity in relation the ghaft me(}ial to and distal to thereto shown in dotted line). -, n ,, ,. , the groove lor the radial nerve. The distal extremity of the humerus is furnished with two articular surfaces (the condyles proper), the lateral of which, called the capitulum, for articulation with the proximal surface of the head of the radius, is a rounded eminence, placed on the anterior surface and distal border, but not extending on to the posterior surface of the distal end of the bone. Proximal to it, in front, there is a shallow depression (fossa radialis), into which the margin of the head of the radius sinks when the elbow is strongly flexed. A shallow groove separ- ates the capitulum medially from the trochlea, which is a grooved articular surface, with prominent edges winding spirally round the distal extremity of the shaft. The spiral curves from behind forwards and medially, and its axis is slightly oblique to the long axis of the shaft. The medial lip is the more salient of the two, and forms a sharp and well-defined margin to the articular area; its cartilage-covered surface is slightly convex. The lateral lip, much less prominent, is rounded off into the articular groove which separates it from
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
