222 PRACTICAL ANATOMY. 



contains the following structures, which you may find on your work : (i) The 

 thoracic portion of the trachea ; (2) the thoracic portion of the oesophagus ; 

 (3) the thoracic portion of the thoracic duct ; (4) the transverse part of the 

 aortic arch ; (5) the imal and innominate arteries ; (6) the thoracic portion of the 

 left subclavian artery ; (7) the innominate veins, and the superior vena cava ; (8) 

 the terminations of the internal mammary veins ; (9) the terminations of the inferior 

 thyroid veins; (10) the superior intercostal vein of the left side ; (11) the two 

 pneumogastric or vagi nerves; (12) the two phrenic and cardiac nerves; 

 (13) the left recurrent or inferior laryngeal nerve; (14) thymus gland in the 

 fcetus and remains of the thymus in the adult. 



Describe tlie pericardium. 



It is a fibro-serous sac surrounding the heart. The pericardium is cone- 



Innominate 



Right pulmonary vein 



RIGHT AURICLE 

 RIGHT AURICLE APPENDIX 



Right coronary 



Branch to anterior wall 

 of right ventricle (pre~ 

 ventricular} 



Right marginal artery 

 and vein (vein of Galen) 



Left carotid 

 Left subclavian 



Left pulmonary vein 



LEFT AURICULAR APPENDIX 



Left marginal artery 



Anterior interventricular 

 branch of the great car- 

 diac vein 



Left coronary (inlerven- 

 tricular) 



Commencing radicles of 



posterior intervtnlrir- 

 ular vein 



FIG. 156. ANTERIOR VIEW OK THE HEART, SHOWING ITS ARTERIES AND VEINS. 



shaped, the base being attached to the central tendon of the diaphragm, the 

 apex being lost in the fibrous sheath of the vessels that arise from the base of 

 the heart. Structurally the pericardium is inelastic. Above it is continuous 

 with the third layer of deep cervical fascia. The pericardium is attached in front 

 to the sternum by sterno-pericardial bands. 



From what source does the pericardium receive its blood-supply .' 



From the phrenic below ; from the internal mammary in front ; from the 

 oesophageal, pericardiac, and bronchial branches of the thoracic aorta behind. 



From what source does the pericardium receive its nerve-supply / 



From the phrenic, vagus, and sympathetic. 



Name the structures at the base of the heart that derive strengthening bands 

 f rot 1 1 the pericardium. 



