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 profunda lies opposite to the last, ascends backwards and 
outwards between the transverse processes of the sixth and seventh cervical 
vertebrxe, 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. 
Pl. 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. Mig. 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 vertebrze ; *, 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. /%g. 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 artery descends from the lower edge of the 
first rib obliquely outwards, to the tendon of the latissimus dorsi muscle ; 
it 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-thoracie 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 superior thoracic arises a little below the preceding, sometimes in 
common with it; it passes forwards and inwards, and divides into branches 
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