ANATOMY IN A NUTSHELL. 



295 



runs upward and backward to structures on the side of the parietal bone, (6) 

 transverse facial branch which crosses the Masseter muscle and passes be- 

 tween the zygoma and the duct of the parotid gland (Stenson's) to the side of 

 the face. (7) middle temporal which passes just below the zygoma through the 

 temporal fascia to the muscle, and sometimes it sends an orbital branch along 

 the upper border of the zygoma, (8) an auricular branch which passes to the 

 external meatus and the front of the ear. 



PLATE CXXVII. 



S T E = '.-'• 



INTERNAL MAMMARY VESSELS 

 LEFT PHRENIC NERVE 

 PARIETAL PLEURA 



VISCERAL PLEURA 



THORACIC DUCT 



INTERNAL MAMMARY VESSELS 



RIGHT PHRENIC NERVE 



PNEUMOGASTRIC NERVES 

 ■ OESOPHAGUS 



VENA AZYGOS MAJOR 



BODY OF DORSAL VERTEBRA 



A Transverse Section of the Pleur.e Through Root of Lungs. 



LESSON LXXXIV. 



The internal maxillary artery (Plate CXV1) passes from the external carotid 

 artery through the parotid gland to the inner side of the neck of the condyle 

 of the lower jaw. It now passes forward and inward along the lower border of 

 the external pterygoid muscle and crosses the inferior dental nerve and is sit- 

 uated between the internal lateral ligament and the ramus of the jaw. This 

 much of the artery is called maxillary portion. It now passes upward and for- 

 ward over the outer surface of the Internal pterygoid muscle and this portion 

 of the artery is called pterygoid portion. It now passes between the heads of 

 the external pterygoid muscle in the spheno-maxillary fossa where it divides 

 into its terminal branches. This portion of the artery is called spheno-maxillary 

 portion. 



The branches of the maxillary portion are (1) tympanic which passes up- 

 ward behind the articulation of the lower jaw through the Glasserian fissure 

 to the ear drum. This artery together with the Stylo-mastoid artery forms a 

 vascular circle around the ear drum. (2) A DEEP auriculae branch which 



