. Diseases of the nervous system . e close together,so that, for instance, tumors which here implicate the bones of the posterior MACROSCOPIC ANATOMY OF THE CENTRAL NERVOUS SYSTEM 25 groove of the skull or the cerebellum, even without attaining great develop-ment, may cause multiple cranial nerve paralyses. The abducens emergesmedially from the transverse furrow between the pons and the medulla,while the facial and acoustic (VII and VIII) nerves appear at the sideof the medulla oblongata. The glossopharyngeal and vagus follow caudad, Bulbus olfactorius (I)Tractus olfactoriusChiasma opticumN. o
. Diseases of the nervous system . e close together,so that, for instance, tumors which here implicate the bones of the posterior MACROSCOPIC ANATOMY OF THE CENTRAL NERVOUS SYSTEM 25 groove of the skull or the cerebellum, even without attaining great develop-ment, may cause multiple cranial nerve paralyses. The abducens emergesmedially from the transverse furrow between the pons and the medulla,while the facial and acoustic (VII and VIII) nerves appear at the sideof the medulla oblongata. The glossopharyngeal and vagus follow caudad, Bulbus olfactorius (I)Tractus olfactoriusChiasma opticumN. opticus (II) j0t<S;\ Polos frontalis Fissura longitudinalis cerebriSulcus olfactorius Hypophysis Trigonum olfactoriumTractus opticus N. oculomotorius(III) N. trochlearis(TV) N. (V) N. abducens(VI) N. facialis(VII) N. inter-medius N. acusticus—-(VIII) N. ^fpharyngeus (IX) Fissura cerebri lateralis(Sylvii) Polus temporalis Substantia per-forata anterior Infundibulum Tuber cine*reum N. vagus (X) N. accessorius. Fossa inter- peduncularis (Tarini) \ Plexus chorioideusventriculi quartj Foramen caecumHcmisphferium cerebelli N. hypoglossus N. spinalis I Medulla oblongata Decussatib pyramidum> Medulla spinalis,Polus occipitalis Fig. 17.—The Base of the Brain Showing the Origin of the Roots of the Cranial basal surface of the cerebrum in its posterior division is covered by the cerebellum. while the spinal accessory and hypoglossal nerves arise from the lateral partsof the lowest portion of the medulla oblongata, the former, indeed, fromthe uppermost part of the cervical cord. The individual parts of the cere-brum and the cerebellum at the base of the brain have been discussed inpreceding sections. 26 MACROSCOPIC ANATOMY OF THE CENTRAL NERVOUS SYSTEM It is characteristic of the arterial blood of the brain that it is suppliedby two channels; the anterior portion of the brain by the internal carotidartery, the posterior part by the vertebral artery w
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