454 TOPOGRAPHICAL ANATOMY. 



On the costal parietes pass ; art. mammaria externa (in front), 

 n. thoracic, poster, (behind) and nn. cutanei brachii. 



On the posterior wall of the axilla : a branch of art. scapular, 

 commun., a nerv. infrascapular., and lymphaticSi 



The largest number of lymphatic glands lie at the internal ante- 

 rior angle above the mm. pectorales, and close to the axillary bor- 

 der of the scapula. 



The Extremities. 



704. Plica cubiti, bend of the elbow, 



is the angle in the anterior region of the elbow, which the articular 

 ends of the upper and forearm form with one another. We there 

 find under the skin and fascia, which above passes into the f. bra- 

 chii, below into the vagina cubiti, the fossa cubiti, a triangular de- 

 pression bounded externally by m. supinator longus, internally by 

 pronator teres, at the base by the tendon of the biceps, and m. 

 brachialis internus (above), the origin of flexores commun. digit. 

 and supinat. brevis (below). Position of the parts in the fossa 

 cubiti : 



1. Ven. mediana. 2. Aponeurosis bicipitis. 3. Art. brachialis 

 between its veins. 4. Nerv. medianus on the inner. 5. Tendon 

 of biceps on the outer side of the artery. 



705. Fossa poplitcea, bend of the knee, 



a rhomboidal shaped space on the posterior (flexion) side of the 

 knee, is formed below by the two heads of m. gastrocnemius, the 

 inner of which is the longer, and partly covered by the tendon of 

 semimembranosus ; the external superior side by the biceps, the 

 internal by the belly of semimembranosus, then by the tendons of 

 the last-named muscle, the semitendinosus, gracilis, and sartorius. 



Position of the parts : 1. Skin thin, smooth, and very extensi- 

 ble. 2. Fibro-cellular tissue with adipose, in which cutaneous veins 

 and the terminal branches of nerv. cutaneus femor . poster, magn. 

 and nerv. cutan. post, medius. 3. Fascia lata ; forming, with a 

 superficial layer, an arch over the fossa, covers with a deep layer 

 the limits and the floor of it ; surrounding also, besides lymphatic 

 glands, fibro-cellular and adipose tissue, the vessels and nerves. 



a. Art. poplitcea, passes pretty nearly in the centre of the fossa, 



