Sagittal MRV slices through the head of a sheep after intravenous injection of Gadolinium (Dotarem).

<p>(<b>A</b>) Dorsal view of the ovine brain. Lines delineate the levels of sagittal MRV slices, letters correspond to the letters in sagittal MRV images; <b>B–H</b>, MRV, sagittal sections. The sagittal sections provided a detailed depiction of all intracranial sinuses and veins, also the deep and ventral cerebral veins and particularly the confluence of sinus (B). Interestingly, the vein of corpus callosum (VCC) could not be detected in MRV. The thalamostriate vein (TSV; B, arrowheads) showed a cornu-like course and drained into the conspicuous internal cerebral vein (ICV; B). The weakly filled basilar cerebral vein (BCV; C, D, E, arrowheads) could easily be identified over a longer distances. BCVs and rhinal veins (RVs) drained through the dorsal petrosal sinus (DPS; D, E, F) into the transverse sinus (TrS; E, F, G). The TrS split into the temporal sinus (TeS) and the sigmoid sinus (SiS; F–H). Note the clear illustration of the TrS, TeS, SiS and the anterior condylar confluent (ACC; D–G). The ACC offered a large extent in these sagittal sections (D, arrowheads). The first (EVRF-1) and the second (EVRF-2; H, arrowhead) emissary vein of retroarticular foramen are clearly visible. <b>ACC:</b> anterior condylar confluent, <b>AR−CS+PP:</b> anastomotic ramus between cavernous sinus and pterygoid plexus, <b>BCV</b>: basilar cerebral vein, <b>CS:</b> cavernous sinus, <b>DPS:</b> dorsal petrosal sinus, <b>DSS:</b> dorsal sagittal sinus, <b>EVJFHC:</b> emissary vein of jugular foramen and hypoglossal canal, <b>EVOrF:</b> emissary vein of foramen orbitorotundum, <b>EVOvF:</b> emissary vein of oval foramen, <b>EVRF-1:</b> first emissary vein of retroarticular foramen, <b>EVRF-2:</b> second emissary vein of retroarticular foramen, <b>GCV:</b> great cerebral vein, <b>ICV:</b> internal cerebral vein, <b>OP:</b> ophthalmic plexus, <b>PTV:</b> profundal temporal vein, <b>RV</b>: rhinal vein, <b>SiS:</b> sigmoid sinus, <b>SS:</b> straight sinus, <b>TeS:</b> temporal sinus, <b>TrS:</b> transverse sinus, <b>TSV:</b> thalamostriate vein, <b>VCC:</b> vein of the corpus callosum, <b>VOS:</b> ventral occipital sinus, <b>VPS:</b> ventral petrosal sinus.