786 ANATOMY AND PATHOLOGY 
Table I. — Nomenclatures for the vertebral-basilar systems in the dog, cat, fox, and man" 
uog 
This paper ('71) 
Dog 
Miller, Ghristensen, 
and Evans ('64) 
Cat 
Bernstein and 
Silverstein ('66) 
Fox 
Wiland ('68) 
Man 
Nomina 
AntitOTTiicOi ('68) 
Vertebral .„ 
Cerebrospinal 
Vertebral 
Cerebrospinal 
Vertebral 
Spinal arterial circle - 
* 
* 
Spinal arterial circle 
••• 
Ventral spinal 
Ventral spinal 
* 
Arterial trunk 
Anterior spinal 
Dorsal spinal 
* 
* 
• 
Posterior spinal 
Meningeal 
* 
* 
Meningeal 
Posterior inferior cerebellar 
Posterior cerebellar 
Posterior cerebellar 
Inferior posterior 
Posterior inferior cerebellar 
cerebellar 
Basilar 
Basilar 
Basilar 
Basilar 
Basilar 
Middle inferior cerebellar _ 
* 
* 
*** 
Anterior inferior cerebellar 
Acoustic, internal 
Anterior cerebellar 
Inferior anterior 
Anterior inferior cerebellar 
auditory 
cerebellar 
Labyrinthine - 
Acoustic, internal 
Labyrinthine 
* 
Labyrinthine 
auditory 
Accessory anterior inferior 
* 
Accessory artery 
* 
«* 
cerebellar 
Superior cerebellar .. 
Anterior cerebellar 
Superior cerebellar 
Rami communicantes 
Superior cerebellar 
cranial 
Accessory superior cerebellar 
* 
* 
** 
* Artery not illustrated or identified in the publication. 
** Term in use but has not had official adoption by the N.A. 
*•* Term not applicable to man. 
The origin and course of the anterior inferior 
cerebellar and labyrinthine arteries in the dog 
were found to be similar to descriptions in fox, 
cat and man.^--^^ Confusion exists in the nomen- 
clature of this artery in quadrupeds because of 
the use of the term "labyrinthine" for the ar- 
tery. We found by chipping away the temporal 
bone that the course of the anterior inferior 
cerebellar artery in the dog is quite similar to 
its course in man, and that therefore it would 
appear logical that the term labyrinthine should 
be reserved for the artery or arteries coursing 
to the membranous labyrinth and the term 
anterior inferior cerebellar be used for the pa- 
rent artery which originates from the basilar. 
A number of investigators have reported the 
physiologic and histopathologic effects of in- 
duced macro- and micro-embolism of the laby- 
rinthine artery in the dog and other small 
quadrupeds.-"--^ Investigators producing this 
type of embolization in the dog, however, may 
not have considered the contribution to the 
membranous labyrinth by the accessory anterior 
inferior cerebellar artery. This artery in our 
specimens was approximately one-half the diam- 
eter of the anterior inferior cerebellar and ap- 
peared capable of transporting a sizeable por- 
tion of the normal blood flow to the membranous 
labyrinth in the event of occlusion or ligation 
of the anterior inferior cerebellar artery. 
Another artery of neuro-physiologic impor- 
tance is a branch of the superior cerebellar 
which richly perfuses the upper and lateral sur- 
faces of the caudal colliculus in the dog. The 
most recent Nomina Anatomica Veterinaria 
(1968) does not list this artery nor do the 
common anatomy textbooks of quadruped mam- 
mals. We have described the origin, course and 
termination of this artery (Figure 30) and sug- 
gested for it the name "artery to the caudal 
colliculus." In other respects the superior 
cerebellar artery of the dog is similar to descrip- 
tions of the human superior cerebellar by Kap- 
lan and Ford.2'^ 
A third previously undescribed artery in the 
dog 8-1° is one which we have described as aris- 
ing from the basilar and coursing to the sen- 
sory root of the trigeminal nerve. It arose 
singly or bilaterally from the rostral portion of 
the basilar artery or superior cerebellar artery. 
After a tortuous course laterally across the 
pons, the artery penetrated the origin of the 
fifth cranial nerve between its sensory and 
motor roots (Figure 31). We have suggested 
the name "trigeminal" artery for this vessel. 
The presence of any artery in close association 
with the sensory root of the trigeminal nerve 
makes surgical section of the pontine attach- 
ment of this nerve a hazardous procedure. The 
fact that in the dog there is such an artery 
