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ANATOMY AND PATHOLOGY 
L. costocervical vein 
Cranial (superior) 
vena cava 
Transverse 
pericardial sinus 
R cranial (superibr) 
pulmonary vein 
Cut edge of 
pericardiunn 
Ascending aorta 
Ligamentum arteriosum 
Pulnnonary trunk 
Coronary sinus 
L. cranial (superior) 
c pulmonary vein 
-L. caudal (inferior) 
pulmonary veins 
Caudal (inferior) 
vena cava 
Oblique pericardial sinus 
Figure 22. — Attachments of base of heart to dorsal (posterior) wall of pericardial sac and pericardial sinuses. 
methyl methacrylate* polymer in an additional 
five dogs. Nomenclature for the intracranial 
arteries of the dog used in this study corre- 
sponds in most cases to the 1968 Nomina Ana- 
tomica terminology (Table I). 
Formation of the origin of the basilar artery 
♦Manufactured by the Imperial Chemical Industries, Ltd. (Great 
Britain ) . 
was from the right and left vertebral arteries 
and ventral spinal artery (Figure 29). The j 
vertebral arteries, after arising from the sub- 
clavian, ascended in the transverse foramina of 
the cervical vertebrae like their homologues in j 
man. Near the intervertebral foramen of the 
atlas, each vertebral artery anastomosed with : 
a branch of the occipital and then passed • 
