/'///: THORAX. 



Contents of Middle Mediastinal Space : 



I. Pericardium and heart, and the cardiac root structures. 

 Phrenic nerve and its artery ctrtcria comes ncrvi phrenici. 

 The aorta, pulmonary artery, and pulmonary vein. 

 The vena cavce, superior and inferior, ascending and descending. 

 The trackeal bifurcation and the two bronchial tubes. 

 Bronchial lymphatic glands and their vessels and nerves. 

 The cardiac plexus of the sympathetic nerve. 



HYOID BONE 



Thyro-hyoid membrane 



THYROID CARTILAGE 



Sterno-thyroid muscle 

 Crico-thyroid 

 membrane 



Crioo-thyroid muscle 



THYROID GLAND 



Right common earotid 



artfrii 



RIGHT PNEUMO- 

 GASTRIC NERVE 



Ili'ihl in/midl jii'/idnr 

 rein 



Level of sternum 



SECTION OF CLAVICLE 

 SECTION OF FIRST RIB 



SECTION OF STERNUM 



Thyro-hyoid muscle 



Lateral portion erieo- 

 thyroid membrane 



Omo-hyoid muscle 



7 Sterno-mastoid muscle 



CRICOID CARTILAGE 

 FIRST RING OF TRACHEA 



TRACHEA 



Left suspensory 



ligament 

 LEFT RECURRENT 



NER VJJ 



(Esophagus 



Left innominate vein 



LEFT LOBE OF TIIYMUS 



Left internal mammary 

 artery 



Pericardium 



SECTION OF FIFTH RIB 

 CARTILAGE 



ENSIFORM CARTILAGE 



FIG. 147. THYMUS GLAND IN A CHILD AT BIRTH. 



The Posterior Mediastinal Contents : 



1. The aorta and posterior intercostal arteries. 



2. The oesophagus and pneumogastric nerves. 



3. The vena asygos and intercostal veins. 



4. The thoracic duct and its fatty bed. 



5 . The thoracic .gangliated sympathetic cord. 



6. The greater, lesser, and smallest splanchnic nerves. 



