CONTENTS
21
- The Brain—
The Hind-brain or Rhombencephalon 738 The Mid-brain or Mesencephalon 741 The Fore-brain or Prosencephalon 741 The Diencephalon 742 The Telencephalon 743 The Commissures 746 Fissures and Sulci 747 The Cranial Nerves 748 The Spinal Cord or Medulla Spinalis. Enlargements 751 Fissures and Sulci 752 The Anterior Median Fissure 752 The Posterior Median Sulcus 752 The Internal Structure of the Medulla Spinalis 753 The Gray Substance 753 Structure of the Gray Substance 755 The White Substance 758 Nerve Fasciculi 759 Roots of the Spinal Nerves 764 The Anterior Nerve Root 764 The Posterior Root 764 The Brain or Encephalon. General Considerations and Divisions 766 The Hind-brain or Rhombencephalon. The Medulla Oblongata 767 The Anterior Median Fissure 767 The Posterior Median Fissure 767 Internal Structure of the Medulla Oblongata 775 The Cerebrospinal Fasciculi 775 Gray Substance of the Medulla Oblongata 779 Inferior Peduncle 782 Formatio Reticularis 784 The Pons 785 Structure 785 The Cerebellum 788 Lobes of the Cerebellum 788 Internal Structure of the Cerebellum 791 The White Substance 791 Projection Fibres 791 The Gray Substance 794 Microscopic Appearance of the Cortex 794 The Fourth Ventricle 797 Angles 797 Lateral Boundaries 797 Choroid Plexuses 798 Openings in the Roof 798 Rhomboid Fossa 798 The Mid-brain or Mesencephalon. The Cerebral Peduncles 800 Structure of the Cerebral Peduncles 801 The Gray Substance 802 The White Substance 803 The Corpora Quadrigemina 805 Structure of the Corpora Quadrigemina 806 The Cerebral Aqueduct 806 The Fore-brain or Prosencephalon. The Diencephalon 807 The Thalamencephalon 808 Structure 810 Connections 810 The Metathalamus 811 The Epithalamus 812 The Hypothalamus 812 The Optic Chiasma 814 The Optic Tracts 814 The Third Ventricle 815 The Interpeduncular Fossa 816 The Telencephalon 817 The Cerebral Hemispheres 817 The Longitudinal Cerebral Fissure 818 The Surfaces of the Cerebral Hemispheres 818 The Lateral Cerebral Fissure 819 The Central Sulcus 819 The Parietooccipital Fissure 820 The Calcarine Fissure 820 The Cingulate Sulcus 820 The Collateral Fissure 820 The Sulcus Circularis 821 The Lobes of the Hemispheres 821 The Frontal Lobe 821 The Parietal Lobe 822 The Occipital Lobe 823 The Temporal Lobe 823 The Insula 825 The Limbic Lobe 825 The Rhinencephalon 826 The Olfactory Lobe 826 The Interior of the Cerebral Hemispheres 827 The Corpus Callosum 828 The Lateral Ventricles 829 The Fornix 838 The Interventricular Foramen 840 The Anterior Commissure 840 The Septum Pellucidum 840 The Choroid Plexus of the Lateral Ventricle 840 Structure of the Cerebral Hemispheres 842 Structure of the Cerebral Cortex 845 Special Types of Cerebral Cortex 847 Weight of Encephalon 848 Cerebral Localization 849 Composition and Central Connections of the Spinal Nerves. The Intrinsic Spinal Reflex Paths 850 Sensory Pathways from the Spinal Cord to the Brain 851 Composition and Central Connections of the Cranial Nerves. The Hypoglossal Nerve 855 The Accessory Nerve 855 The Vagus Nerve 855 The Glossopharyngeal Nerve 856 The Acoustic Nerve 857 The Vestibular Nerve 860 The Facial Nerve 861 The Abducens Nerve 861 The Trigeminal Nerve 862 The Trochlear Nerve 863 The Oculomotor Nerve 863 The Optic Nerve 864 The Olfactory Nerves 866 Pathways from the Brain to the Spinal Cord. The Motor Tract 870 The Meninges of the Brain and Medulla Spinalis. The Dura Mater 872 The Cranial Dura Mater 872 Processes 873 Structure 875 The Spinal Dura Mater 875 Structure 876 The Arachnoid 876 The Cranial Part 876 The Spinal Part 876 Structure 876 The Subarachnoid Cavity 876 The Subarachnoid Cisternæ 876 The Arachnoid Villi 878 Structure 878 The Pia Mater 878 The Cranial Pia Mater 879 The Spinal Pia Mater 879 The Ligamentum Denticulatum 880
