FIG. 37. A–C, Galago demidovii MPIH 120 in Transverse Canal Foramen And Pericarotid Venous Network In Metatheria And Other Mammals

FIG. 37. A–C, Galago demidovii MPIH 120 (Galagidae, Primates), near-term fetus; D, Microcebus murinus MPIH 1962/57 (Cheirogaleidae, Primates), fetus; and E, Elephantulus fuscipes MPIH 311/E1 (Macroscelididae, Macroscelidea), fetus. Coronal sections, all to same scale. In A and B (ss. 961, 979, sides rev.), rete mirabile with ascending pharyngeal artery, internal carotid vein, and basicranial venous plexus. In C and D (ss. 1285; 91/2/3), relatively large internal jugular vein, typical of strepsirhines, receives multiply branching basicranial venous plexus. In E (s. 1558), mesocranial vascular arrangements in sengis are quite different from those seen in strepsirhines: vein (asterisk) running across tympanic roof to accompany internal carotid artery into endocranium originates from prootic sinus, therefore not homologous with internal carotid vein. Key: AC, auditory capsule; acc, alicochlear commissure; apa, ascending pharyngeal artery; AS, alisphenoid; BS, basisphenoid; bvp, basicranial venous plexus; C1, atlas vertebra; cat, cartilage of auditory tube; cbca, cerebral carotid artery; cca, common carotid artery; CEN, caudal entotympanic; cptp, caudal tympanic process of petrosal; cs, cavernous sinus; EC, ectotympanic; ecvr, extracranial arterial rete; ejv, external jugular vein; EO, exoccipital; GO, gonial; gpn, greater petrosal nerve; hp, hypophysis; ica (pra), internal carotid artery (promontorial artery); icn, internal carotid nerve; icv, internal carotid vein (= internal carotid venous plexus); ijv, internal jugular vein; MC, meckelian cartilage; mdn, mandibular nerve; PE, petrosal; pglv, postglenoid vein; pr, promontorium; REN, rostral entotympanic; rssa, ramus superior of stapedial artery; STH, stylohyal; stm, stapedius muscle; tg, trigeminal ganglion; tmc, tympanic cavity; tt, tegmen tympani; ttm, tensor tympani muscle; vg, vagus ganglion; vps, ventral petrosal sinus.