ANATOMY IN A NUTSHELL. 4S1 



S. The posterior auricular vein conies from a plexus on the side of the head 

 and hack of ear. It receives the stylo-mastoid vein and branches from the 

 external ear. It joins the temporo-maxillary to form the external jugular. 



9. The occipital vein is formed from a plexus at the hack part of the vertex 



of the skull. It is placed deeply between muscles of neck. It passes over the 

 suboccipital triangle under theComplexus muscle where it communicates with 

 the vertebral vein. It empties into the internal jugular as a rule, hut occasion- 

 ally into the external jugular. 



The Veins of the Neck. (Plate CXV.) 



1. The external jugular vein collects the blood from the exterior part of 

 the cranium and the deep part of the face. It is formed by the junction of pari 

 of the temporo-maxillary trunk and the posterior auricular veins in the sub- 

 stance of the parotid gland at the angle of the jaw. From this point it passes 

 down beneath the Platysma myoides muscle over the Sterno-cleido-mastoid 

 muscle and ends near the clavicle in the subclavian vein. Sometimes it empties 

 into the internal jugular vein. It has two pairs of valves which do not prevent 

 the regurgitation of blood, as they are not complete valves. The portion of 

 the vein between the two valves is called a sinus. The upper pair of valves is 

 about an inch and a half above the clavicle, while the lower pair is at its temi- 

 nation into the subclavian vein. Its radicles are (a) posterior external jugular, 

 (b) suprascapular, (c) transverse cervical, (d) frequently the anterior jugular. 



2. The posterior external jugular vein receives the blood from the integu- 

 ment and muscles in the tipper and back part of the neck and also from the 

 occipital region. It lies between the Splenitis and Trapezius muscles. It 

 empties into the middle of the external jugular vein. 



'A. The anterior jugular vein aiises near the hyoid bone and is formed by 

 the superficial veins of the submaxillary region. It collects the blood from the 

 superficial muscles and integument of anterior and middle regions of neck. It 

 joins its fellow just above the sternum. Ii empties into the subclavian or ex- 

 ternal jugular vein. It has no valves. 



4. The internal jugular vein collects the blood from the brain and the 

 superficial pint of the face. It is formed by the inferior petrosal sinus and 

 lateral sinus. It passes down the side of the neck in the common carotid sheath 

 on the outer side of the carotid artery. For contents of this sheath see page 

 282. It joins the subclavian vein near the inner margin of the Scalenus ami- 

 cus muscle. It is provided with a pair of valves which are placed about three- 

 fourths of an inch above its termination. Its radicles are (a) pharyngeal, 

 d>) lingual, and under lingual we have dorsal of tongue and Lingual vena comites 

 and ranine, (c) common facial, (d) superior thyroid, under which we have laryn- 

 geal and ci'ico-t hyroid, (e) middle thyroid, (f) occipital, which may be a radicle 

 of the external jugular. 



."). The vertebral vein commences in the occipital region and drains the 

 deep muscles at the upper and back pari of the neck. This is more of :i plexus 



of veins than one large vein and they run down through the foramina in the 



