Fig. 3. The disposition of the main blood vessels in the neck region and the basis cranii. 



Thymus gland removed. 



a 1 , Internal pterygoid muscle 



a 2 , External pterygoid muscle 



a 3 , Palatoglossus muscle 



a 4 , Masseter muscle 



a 5 , Middle constrictor muscle of the pharynx 



a 6 , Depressor mandibulae muscle 



a 7 , Sterno-mandibularis muscle 



a 8 , Sterno-mastoid muscle 



a 9 , Scalene muscle 



b 1 , Dorsal aorta 



b 2 , Pulmonary artery 



b 3 , Ductus arteriosus 



b*, Left subclavian artery 



b 5 , Common carotid artery 

 b 6 , Brachiocephalic artery 

 b' ', Internal carotid artery 

 6 8 , External carotid artery 

 b 9 , Posterior thoracic artery 

 b 10 , Internal mammary artery 

 b 11 , Brachial artery 

 c 1 , Precava 



c 2 , Brachiocephalic vein 

 c 3 , Brachial vein 

 c*, External jugular vein 

 c 5 , Internal jugular vein 

 c 6 , Internal mammary vein 



c 7 , Posterior thoracic vein 



c 8 , Maxillary vein 



d 1 , Phrenic nerve 



d 2 , Pneumogastric nerve 



d 3 , Fifth nerve 



d*, Hypoglossal nerve 



e, Mandible 



/, Nasopharynx 



g, Larynx 



h, Meckel's cartilage 



i, Tympanic bulla 



j, Lung 

 k, Heart 



