ioo THE POCKET ANATOMY 



Internal maxillary : is formed by branches corresponding 

 with those of the internal maxillary artery. The branches 

 form a plexus (pterygoid) placed between the pterygoid 

 muscles. The trunk of the vein passes backwards with artery 

 internal to neck of condyle to join temporal vein, and form 

 temporo-maxillary trunk. 



/middle meningeal (2). 

 deep temporal, 

 pterygoid. 

 masseteric. 



The pterygoid plexus is 

 formed by 



infra-orbital. 



buccal. 



superior palatine. 



inferior dental. 



posterior dental. 



Vidian. 



The pterygoid plexus communicates with the facial vein by 

 the anterior internal maxillary vein (deep facial). 



Temporo-maxillary : formed by union of temporal and 

 internal maxillary veins ; descends in parotid gland on ex- 

 ternal carotid artery and crossed by facial nerve, divides into 

 two branches, one of which unites with the facial as the 

 communicating facial, and the other receives the posterior 

 auricular vein to form the trunk of the external jugular vein . 



Posterior auricular : from plexus on side of head and back 

 of ear, receives stylo-mastoid vein, and branches from ex- 

 ternal ear; joins into temporo-maxillary to form external 

 jugular vein. 



Occipital : from plexus at back part of vertex of skull, 

 placed deeply between muscles of neck, and having on 

 scalp same course as artery; it then passes deeply under 

 complexus, over suboccipital triangle, where it communicates 

 with vertebral, and passes on semispinalis into deep cervical 

 vein ; communicates with lateral sinus by mastoid veins. 



External jugular : formed by junction of part of temporo- 

 maxillary trunk and posterior auricular veins at angle of jaw 

 in the substance of parotid. Descends beneath platysma 

 over sterno-mastoid, pierces deep fascia near the clavicle to 

 open into subclavian, or occasionally into the internal jugular. 

 Has two pair of valves. Receives posterior external jugular, 

 draining superficial region at back of neck, supra-scapular, 

 transverse cervical, and frequently the anterior jugular . 



Anterior jugular : drains integument and superficial muscles 

 of anterior, ^ntf middje re^ions o of neck. Empties into sub- 

 clavian or dfctfcrn^l jugular- : cpmfnunicates with *ellow just 



