508 



BLOOD-VESSELS OF THE NECK. 



enter into the external jugular, besides the temporal and 

 internal maxillary, are the occipital, posterior cervical 

 FIG. 154. cutaneous, and the posterior and 



supra scapular reins, the last of 

 which joins it at its termination. 

 This vein communicates with 

 the internal jugular, generally 

 at its upper part, and in its 

 descent with the anterior jugu- 

 lar. It is, however, very varia- 

 ble, being sometimes double and 

 very small. It returns the 

 blood from the external parts of 

 the head, integuments and su- 

 perficial muscles of the neck. 



The internal jugular vein is 

 the great channel receiving the 

 blood of the sinuses already 

 noticed in the account of the brain. It commences at the 

 foramen lacerum posterius, where the lateral sinuses ter- 

 minate, then descends the neck first on the outside of and a 

 little behind the internal carotid, then on the outside of the 

 common carotid artery to the root of the neck, where it 

 joins with the subclavian to form the vena innominata of 

 each side at its superior portion the ninth and eighth pair 

 of nerves are on its inside, and the styloid process with its 

 muscles are in front. The lingual and glosso-pharyngeal 

 nerves are between this vein and the artery a little lower 

 down, while the spinal accessory passes behind in its out- 

 ward direction. The rest of the course of this vein is 

 enclosed in the same sheath with the common carotid 

 artery and pneumogastric nerve, receiving in its descent 

 the facial, lingual, pharyngeal, and thyroid veins, and 

 communicating freely with the external jugular. 



FIG. 154 represents the Veins of the Neck and Head, a Frontal vein. 

 6 Nasal vein, c Supra orbital, d Angular vein, e Facial vein. / Superfi- 

 cial temporal veins, g Middle temporal, h Masseteric plexus of veins. 

 i Occipital veins, j External jugular, k Internal jugular. I Anterior jugu- 

 Jar m Scapular veins, n Subclavian vein, o Vena innominata. 



