WESLEY D. ANDERSON 
793 
Posterior cerebral 
Posterior communicating 
Superior cerebellar 
Accessory superior 
cerebellar 
Accessory anterior 
inferior cerebellar 
Trigeminal' 
Labyrinthine 
Anterior inferior 
cerebellar 
Middle inferior 
cerebellar 
Posterior inferior 
cerebellar 
Dorsal spinal 
Meningeal brs 
Vertebral 
Ventral spinal 
Figure 29. — Common pattern of the basilar artery of the dog from 30 specimens. Variations in arterial relations 
in the porus acusticus and internal acoustic meatus are shown (insert, upper right). 
85 experiments studying hypovolemic shock,^^ 
it was necessary to bilaterally ligate the femoral 
artery in dogs for purposes of blood pressure 
measurements and withdrawing blood into a 
shed-blood reservoir. All animals maintained 
adequate blood flow to the distal limbs and sus- 
tained no ischemic complications from the fem- 
oral ligations. 
Collateral circulation to the distal pelvic limb 
of the horse (Figure 43) is not as well developed 
Table III. — Key to the Major Arteries of the Pelvic 
Limb of the Dog, Calf and Horse 
1. 
Aorta 
5. Femoral 
2. 
Deep circumflex iliac 
5.1 Cranial femoral 
3. 
Internal iliac 
5.2 Descending geniculate 
3.1 Cranial gluteal 
5.3 Caudal femoral 
3.2 Caudal gluteal 
5.4 Saphenous 
4. 
External iliac 
6. Popliteal 
4.1 Pudendoepigastric trunk 
6.1 Caudal tibial 
4.2 Deep femoral 
6.2 Cranial tibial 
4.3 Obturator artery 
as is the dog's ; however it appears to be much 
better than the collateral circulation in the 
pelvic limb of the calf (Figure 44). 
SUMMARY 
Aspects of the gross and microscopic anatomy 
of the cardiovascular systems of the sheep, calf, 
dog, pig and horse were correlated with the 
cardiovascular system of man. They were: 
(1) thorax; 
(2) arterial supply to the spinal cord; 
(3) the vertebral-basilar system of the brain ; 
(4) blood flow measurements in the basilar 
artery ; 
(5) arterial supply and autonomic innerva- 
tion of the stomach in sheep and calf ; and 
(6) femoral triangle and collateral circula- 
tion to the caudal extremities. 
