WESLEY D. ANDERSON 
785 
Superior vena cava — y 
Rt. pulmonary a 
Transverse sinus 
Rt. superior 
pulmonary v. 
Rt. inferior 
pulmonary v. 
Inferior vena cava 
Arch of aorta 
Left pulmonary a. 
Pulmonary trunk 
Ascending aorta 
Left superior 
pulmonary v. 
Left inferior 
pulmonary v. 
Oblique sinus 
Cut edge of 
pericardium 
Figure 23. — Human pericardial sinuses and pericardial attachments. 
Reproduced by permission from: W. Henry Hollinshead, TEXTBOOK OF ANATOMY (ed. 2). Copyright (1967). Hoeber Medical Di- 
vision — Harper & Row., New York. 
through the intervertebral foramen into the 
vertebral canal. The vertebral arteries and the 
relatively large ventral spinal artery formed 
a spinal arterial circle at the level of the at- 
lanto-occipital articulation. The rostral portion 
of the circle generally extended a short distance 
into the cranial cavity and continued as the 
basilar artery. The branches of the intracranial 
portion of the vertebral-basilar system of the 
dog and the portions of the brain and spinal 
cord supplied by this system are listed in Table 
II. 
The dorsal spinal arteries usually arose from 
the vertebral arteries and descended on the up- 
per surfaces of the spinal cord. 
The posterior inferior cerebellar arteries 
arose either from the vertebral arteries (as 
they do in man^") or from the basilar. In this 
study they were traced to the lower and caudal 
lobules of the cerebellum listed in Table II. 
