66 



PR A CTICAL ANA TO. M ) . 



The suprascatpular to the shoulder. 



The inferior tliyroid to the thyroid gland. 



The transvcrsalis colli. 



1. The internal mammary (Fig. 36) is given off from the under part of 

 the first stage of the subclavian artery. Its course, branches, anastomoses, and 

 important relations are in the anterior thoracic walls, where you will find its 

 description when you dissect that part. 



2. The suprascapular artery (Fig. 37) is attended by a vein and nerve of 

 the same name. It crosses the trunks of the brachial plexus, and is distributed 

 to the supra- and infraspinati muscles. 



3. The Inferior Thyroid Artery. Trace this artery behind the common 

 carotid artery and sympathetic nerve. Very often the middle cervical ganglion 

 of the sympathetic nerve rests on the inferior thyroid artery. Usually the artery 



Scalenus medius 



Scale-ius anticua and 



on it phrenic nerve 



Transverse CITI ifal 

 artery 



Suprascn/inlnr nrtf.ry 



Sitbcliiiian artery 



conn OF BRA CIHA L 



f'LK.YUX, GIVING 

 OFF MUSCULO- 

 CUTAXEOUS ANT) 

 OUTER HEAD OF 

 MEDIAN NERVES 



Axillary artery 



IfUSCULO-SPIRA L 



NKR \'E 



T/ii/roitl mix 

 Internal j ugii/ar vein 



Right common carotid 



artery 



PNEUMOGA8TR1C 

 NERVE 



ieiK-fnirnt of 

 iniiominatf, vein 



FIG. 37. THE SUBCLAVIAN VKSSKI.S. 

 (From a dissection in the Hunterian Museum.) 



lies in front of the recurrent laryngeal nerve ; sometimes you will find the reverse 

 is true. In operations on the thyroid gland isolate (i) the recurrent laryngeal 

 nerve, (2) the sympathetic. 



The branches of the inferior thyroid artery : 



1. The inferior laryngcal to the larynx. 



2. Trachcal branches to the trachea. 



3. Utsopltagcal branches to the oesophagus. 



4. Jtram/ies to the depressor muscles of the hyoid bone. 



5. Ascending cervical brandies to the muscles of the neck. 



The Superior Intercostal Artery (Fig. 39). This is given off from th< 

 second stage of the subclavian artery. It gives off a communicating branch t( 

 the first aortic intercostal, which you will find high in the thorax, when yoi 



