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

<p>(<b>A</b>) Lateral, left view of the ovine brain. Lines delineate the levels of coronal MRV slices, letters correspond to the letters in coronal MRV images; <b>B–K,</b> MRV, coronal sections. The angioarchitecture of the dorsal and ventral sinus systems including their connecting veins was clearly depicted after contrast injection of Gadolinium (Dotarem) in comparison to the deep and ventral cerebral veins. Note the completely visible signals of the dorsal sagittal sinus (DSS; B–G), the transverse sinus (TrS; G–I), the temporal sinus (TeS; G–I), the sigmoid sinus (SiS; I–K), the cavernous sinus (CS; D–G), the ventral petrosal sinus (VPS; H), the ventral occipital sinus (VOS; K), the anterior condylar confluent (ACC; J), as well as the great cerebral vein (GCV; E, F) and the straight sinus (SS, F, G). Note the faint signal of the thalamostriate veins (TSV; C, D), the internal cerebral veins (ICV, D), the basilar cerebral vein (BCV), and the dorsal petrosal sinus (DPS; D, F, H). Two anastomotic rami could be seen in MRV strongly: the anastomotic ramus between cavernous sinus and pterygoid plexus (AR-CS+PP; D) with a highly signal intensity and the anastomotic ramus between BCV and CS (AR-BCV+CS; G) as a diminutive vessel. <b>ACC:</b> anterior condylar confluent, <b>AR−BCV+CS:</b> anastomotic ramus between basilar cerebral vein and cavernous sinus, <b>AR−CS+PP</b>: anastomotic ramus between cavernous sinus and pterygoid plexus, <b>AR−VOS:</b> anastomotic ramus between both ventral occipital sinus, <b>BCV</b>: basilar cerebral vein, <b>BuV:</b> buccal vein, <b>CIS:</b> caudal intercavernous sinus, <b>DCV:</b> dorsal cerebral vein, <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 the foramen orbitorotundum, <b>EVOvF:</b> emissary vein of oval 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>STV:</b> superficial temporal vein, <b>TeS:</b> temporal sinus, <b>TrS:</b> transverse sinus, <b>TSV:</b> thalamostriate vein, <b>VOS:</b> ventral occipital sinus, <b>VPS:</b> ventral petrosal sinus.