336 VEINS OF THE UPPEK EXTREMITY. 



condyloid vein, muscular branches, the cervical meningo-rachidian 

 veins, and, near its termination, the superficial and deep cervical 

 veins. 



The Inferior thyroid veins, two, and frequently more in number, 

 are situated on one side of the trachea, and receive the venous 

 blood from the thyroid gland. They communicate with each other 

 and with the superior thyroid veins, and form a plexus upon the 

 front of the trachea. The right vein terminates in the right vena 

 innominata, just at its union with the superior cava, and the left in 

 the left vena innominata. 



VEINS OF THE UPPER EXT EMITY. 



The veins of the upper extremity are the deep and \superficial. 

 The deep veins accompany the branches and trunks of the arteries, 

 and constitute their vena; comites. The venae comites of the radial 

 and ulnar arteries are enclosed in the same sheath with those ves- 

 sels, and terminate at the bend of the elbow in the brachial veins. 

 The brachial vena? comites are situated one on each side of the 

 artery, and open into the axillary vein ; the axillary becomes the 

 subclavian, and the subclavian unites with the internal jugular to 

 form the vena innominata. 



The Superficial veins of the fore-arm arc the 



Anterior ulnar vein, 

 Posterior ulnar vein, 

 Basilic vein, 

 Radial vein, 

 Cephalic vein, 

 Median vein, 

 Median basilic, 

 Median cephalic, 



The Anterior ulnar vein collects the venous blood from the inner 

 border of the hand, and from the vein of the little-finger, vena sal- 

 vatella, and ascends the inner side of the fore-arm to the bend of 

 the elbow, where it becomes the basilic vein. 



The Posterior ulnar vein, irregular in size and frequently absent, 

 commences also upon the inner border and posterior aspect of the 

 hand, and, ascending the fore-arm, terminates in front of the inner 

 condyle, in the anterior ulnar vein. 



The Basilic vein (/3arfiXixog, royal, or principal) ascends from the 

 common ulnar vein, formed by the two preceding, along the inner 

 side of the upper arm, and near its middle pierces the fascia ; it 

 then passes upwards to the axilla, and becomes the axillary vein. 



The Radial vein commences in the large vein of the thumb, on 

 the outer and posterior aspect of the hand, and ascends along the 

 outer border of the fore-arm to the bend of the elbow, where it 

 becomes the cephalic vein. 



