PLATE VI 



PJate VI is from a section through the lower part of 

 the second thoracic vertebra posteriorly, the sternoclavi- 

 cular articulations anteriorly, and through the infraglenoid 

 tubercles, and below the spines of the scapulae laterally. 

 The plane of the section is 1.7 cm. anteriorly and 2 cm. 

 posteriorly below section V so that the anterior margin is 

 2.9 cm. lower than the posterior. 



The left innominate vein (V. anonyma sinistra) crosses 

 the median line in this section and unites with the right in- 

 nominate vein (V. anonyma dextra) about 2 cm. to the right 

 of the midline. Its course across the mediastinal space is 

 indicated by dotted lines. 



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