186 ANATOMY IN A NUTSHELL. 



1. The anterior cardiac veins collect the blood from the anterior surface of 

 the right ventricle and empty into the lower part of the righl auricle. There 

 are three or four of these veins, and the largest one, which is called the vein 

 of Galen passes along the right border of the heart. 



5. The right coronary vein (small coronary) empties into the coronary 

 >inus after passing between the righl auricle and the right ventricle. Its rad- 

 icle- are, (a) from the hack part of the right auricle, (h) from the hack part of 

 the right ventricle. 



6. Venae Thesesii, also called venae cordis minimse, open by small orifices 

 on the inner surface of the right auricle. These orifices are called foramina 

 Thebesii. 



7. The coronary sinus is a dilatation situated in the posterior part of the 

 hit auriculo-ventricular groove. It receives all the veins just mentioned ex- 

 cept the vena 1 Thebesii, and it also receives the oblique vein of Marshall, which 

 is from the back part of the left auricle. This vein empties into the right auricle 

 of the heart between the inferior vena cava and the auriculo-ventricular open- 

 ing. It is guarded by the valve of Thebesii (coronary). All these veins of the 

 heart, which empty into the coronary sinus have valves except the oblique 

 vein of Marshall. 



Tuk veins of Spinal Column and Cord. 



The veins of the spinal column and cord are: (Plates CI-CII.) 



1 . Dorsi-spinal veins, which collect the blood from the back on either side 

 of the spinous processes. These veins form a great plexus, which join the 

 veins in the spinal canal by branches which perforate theligmenta subflavaand 

 by other branches which pass through the intervertebral foramina. These 

 veins end in the vertebrals in the neck, in the intercostal veins, and in lumbar 

 and sacral veins in their respective regions. 



2. Meningo-raehidian veins, which are situated in the spinal canal, form 

 two greal columns, (a) the anterior longitudinal spinal veins which pass from 

 the foramen magnun to the base of the coccyx. There are two of these anterior 

 longitudinal spinal columns, one on each side of the posterior surface of the 

 bodies of the vertebras. The radicles of these veins are venae basis vertebrarum. 

 These veins communicate with the dorsi-spinal veins, vertebral veins, inter- 

 costal veins, Lumbar ami sacral veins, (b) The posterior longitudinal spinal 

 veins are situated along the posterior border of the spinal canal. They com- 

 municate freely with the anterior ones, the dorsi-spinal veins, vertebral veins, 

 intercostal veins, lumbar veins and sacral veins. The meningo-raehidian veins 

 are not of uniform caliber and communicate freely with one another, thus form- 

 ing sort of a plexus. 



3. Venae basis vertebrarum pass from the posterior surface of the vertebrae 

 to join the transverse trunk connecting the anterior spinal veins. They collect 

 the blood from the substance of the hone and are similar to the veins of the 

 diplce found in the hones of the cranium. 



4. The medulli spinal veins collect the blood from the substance of the cord 

 which forms a venous plexus around the entire surface of the cord between 



