Exploration of the meninges and brain in situ

Brain stem and cranial nerves

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Image #3-6

Exploration of the meninges and brain in situ Brain stem and cranial nerves The cerebellar peduncles (25, 26, 28) have been cut through and the left cerebellar hemisphere removed from the posterior cranial fossa. The tela chorioidea and choroid plexus (13) of the fourth ventricle were left in place. The ventricle is thus only partially opened. Choroid plexus covers the rootlets of the ninth and tenth nerves as they emerge from the medulla. 1 . Optic nerve (II) (cut across) 2 . Inferior cerebral vein 3 . Oculomotor nerve (III) 4 . Branches of cerebral artery posterior to brain stem (lateral central branches) 5 . Superior cerebellar artery (cut across) 6 . Trigeminal nerve (V) 7 . Cerebellar vein (petrosal vein) 8 . Superior petrosal sinus (opened) 9 . Facial nerve (VII) and vestibulocochlear nerve (VIII) 10 . Anterior inferior cerebellar artery (cut across) 11 . Transverse sinus (cut across) 12 . Glossopharyngeal nerve (IX), vagus nerve (X), and accessory nerve (Xl) 13 . Choroid plexus fourth ventricle 14 . Spinal root of accessory nerve (XI) lying against dura 15 . Roots hypoglossal nerve (XII) 16 . Verterbral artery left (ascending through cerebellomedullary cistern beneath medulla) 17 . Medulla oblongata 18 . Margin of foramen magnum (cut across) 19 . Vertebral artery passing medially across arch of atlas 20 . Mesencephalon (cut across) 21 . Superior cerebellar vein 22 . Inferior colliculus 23 . Trochlear nerve (IV) 24 . Cerebellar lingula 25 . Superior cerebellar peduncle (cut across below pointer) 26 . Brachium pontis (middle cerebellar peduncle) (cut across) 27 . Fourth ventricle 28 . Inferior cerebellar peduncle(cut across) 29 . Cerebellum (sagittal section) 30 . Straight sinus (opened) 31 . Fourth ventricle (visible through medial aperture fourth ventricle [foramen of Magendie]) 32 . Posterior inferior cerebellar artery right 33 . Cerebellar tonsil 34 . Clava 35 . Occipital sinus 36 . Falx cerebelli 37 . Root of cervical nerve (II)