ANGEIOLOGY. 87 



and trapezius, as also the infra-spinatus and teres minor ; 4. Transversalis 

 colli, which ascending beneath the trapezius, divides into the cervicalis 

 superficialis, going to the superficial muscles of the side and back part of the 

 neck, and the posterior scapular artery. 



The internal mammary artery arises opposite the thyroid axis ; it 

 descends obliquely forwards, between the cartilages of the ribs and the 

 pleura, as far as the ensiform cartilages ; sending off branches to various 

 parts of the thorax, it terminates in the diaphragm and the abdominal 

 muscles. 



The superior intercostal artery arises between the scaleni, descends behind 

 the pleura, in front of the neck of the first and second ribs, and supplies the 

 two first pairs of intercostal muscles. 



The cervicalis p)rofunda lies opposite to the last, ascends backwards and 

 outwards between the transverse processes of the sixth and seventh cervical 

 vertebrge, and ascending on the back of the neck, supplies the complexus 

 and other deep muscles in that region, and inosculates with the descending 

 branches of the occipital artery. 



PI. 135, fig. 7, arteries of the brain : '^, vertebral artery ; '', posterior 

 inferior cerebellar artery ; '', basilar artery ; '", anterior inferior cerebellar 

 artery ; '\ superior cerebellar artery ; ", deep cerebral artery. Fig. 8 ', 

 portion of the subclavian ; ^, common trunk of the vertebral and deep 

 cervical arteries; ', course of the vertebral artery through the transverse 

 processes of the vertebras ; \ its first curvature ; *, the second curvature or 

 bend; ", its course within the cranium ; ', basilar artery, with its ramifica- 

 tions ; ', deep cervical ; *' '", interosculations between this and the vertebral; 

 ", upper end of the transversalis. Fig. 1"', inferior thyroid; ", vertebral; 

 ", entrance into the vertebral canal ; ■■", superior intercostal ; ", transversalis 

 colli; ^'', ascending cervical; '', internal mammary; ", small branches for 

 the anterior mediastinum. 



2. Axillary Artery. This arter}^ descends from the lower edge of the 

 first rib obliquely outwards, to the tendon of the latissimus dorsi muscle ; 

 il; is covered by the integuments, and at first by the external border of the 

 pectoralis major, still lower down by the tendon only of this muscle ; it 

 passes over the first intercostal, serratus magnus, subscapular, and tendons 

 of the latissimus dorsi and teres major. The axillary vein descends along 

 its inner and anterior parts, and the brachial plexus lies posterior and exter- 

 nal to it. It sends off the following arteries : thoracica acromialis, supe- 

 rior and long thoracic, the subscapular, the posterior and anterior circum- 

 flex. 



The acromio-fhoracic artery arises from the front of the axillary below 

 the subclavian muscles, above the pectoralis minor, and opposite the fissure 

 between the pectoralis major and deltoid muscles; it divides into several 

 branches, some of which pass to the pectoral muscles, others to the acro- 

 mion process, deltoid muscle, and integuments of the shoulder and arm. 

 One long brnnch accompanies the cephalic vein. 



The stqjerior thoracic arises a little below the preceding, sometimes in 

 common with it ; it passes forwards and inwards, and divides into branches 



793 



