480 ANATOMY IN A NUTSHELL. 



The veins of the dura mater of the brain are called sinuses, also cavities in 

 bones arc called sinuses. After the blood has left the heart by way of the 

 arteries and nourished the entire body, it comes back to the heart by means of 

 veins. We have a pulmonary venous system and a systemic venous system. 

 The veins of the upper extremity have been described on page 117 and the veins 

 of the lower extremity have been described on page 192. We will now give the 

 remaining veins of the body. 



Tin: Veins ok the Exterioe of the Head and Face. 



1. The frontal vein passes down the middle of the frontal bone to the inner 

 canthus of the eye, after which it is called angular. It lies parallel with its 

 fellow of the opposite side which it joins by a transverse branch just before it 

 reaches the root of the nose. At their beginning the frontal veins communi- 

 cate with the temporal veins. At the inner angle of the orbit they receive the 

 the supraorbital veins. Plate CXV. 



2. The supraorbital vein lies on the forehead externally to the frontal vein 

 which it joins to form the angular vein at the inner angle of the orbit. 



3. The angular vein passes from the inner canthus of the eye where it is 

 formed by the two veins just mentioned and passes to the base of the nose. Its 

 radicles are (a) supraorbital, (b) frontal, (c) superior palpebral, and (d) nasal, 



4. From the base of the nose this vein continues as the facial, which passes 

 under the Zygomatici muscles and over the anterior border of the Masseter 

 muscle in a groove on the inferior maxillary bone. From here it passes into 

 the internal jugular after communicating with the external jugular. Its radi- 

 cles are (a) angular, (b) inferior palpebral, (c) dorsal and lateral nasal, (d) 

 anterior internal maxillary (deep facial), (e) coronary (superior and inferior), 

 (f) buccal, (g) masseteric, (h) labial, (i) submental, (j) ascending palatine, (k) 

 tonsillar, (1) glandular (parotid and submaxillary), (m) part of the temporo- 

 maxillary. 



5. Temporal vein is formed. by the anterior temporal and posterior tem- 

 poral which collects the blood from the side and the vertex of the head and 

 after uniting above the zygoma, passesover the zygoma to be situated in front 

 of the ear between the condyle of the jaw and the external auditory meatus. 

 It now passes in tn the substance of the parotid gland where it receives the in- 

 ternal maxillary vein to form the temporo-maxillary vein. The radicles of 

 this vein are (a) anterior temporal, (b) posterior temporal, (c) middle temporal, 

 (d) parotid, (e) anterior auricular, (f) transverse facial. 



6. The internal maxillary vein is formed by radicles which correspond to 

 the branches of the internal maxillary artery. These radicles form the 

 pterygoid plexus of veins, and this plexus of veins communicates with the facial 

 vein by the anterior internal maxillary vein or deep facial. 



7. The temporo-maxillary vein is formed by the temporal and internal 

 maxillary veins in the substance of the parotid gland. At the angle of the jaw 

 it joins the posterior auricular to form the external jugular. It may however, 

 divide into an anterior branch which joins the facial vein and a posterior branch 

 which joins the posterior auricular to form the external jugular. 



