The anatomy of the nervous system, from the standpoint of development and function . as follows: (1) afferent and efferent root fibers,(2) those of the fasciculi proprii. (3) the fasciculus cuneatus, (4) the fasciculusgracilis, (5) the dorsal spinocerebellar tract, (6) the ventral spinocerebellar fas-ciculus, (7) the corticospinal tracts. CHAPTER VIII THE GENERAL TOPOGRAPHY OF THE BRAIN. THE EXTERNALFORM OF THE MEDULLA OBLONGATA, PONS, AND MESEN-CEPHALON The General Topography of the Brain.—The brain rests upon the floor ofthe cranial cavity, which presents three well-marked fossae. In the pos
The anatomy of the nervous system, from the standpoint of development and function . as follows: (1) afferent and efferent root fibers,(2) those of the fasciculi proprii. (3) the fasciculus cuneatus, (4) the fasciculusgracilis, (5) the dorsal spinocerebellar tract, (6) the ventral spinocerebellar fas-ciculus, (7) the corticospinal tracts. CHAPTER VIII THE GENERAL TOPOGRAPHY OF THE BRAIN. THE EXTERNALFORM OF THE MEDULLA OBLONGATA, PONS, AND MESEN-CEPHALON The General Topography of the Brain.—The brain rests upon the floor ofthe cranial cavity, which presents three well-marked fossae. In the posteriorcranial fossa are lodged the medulla oblongata, pons, and cerebellum, whichtogetherconstitute the rhombencephalon (Fig. 81). This fossa is roofed overby a partition of dura mater, called the tentorium cerebetti, that separates thecerebellum from the cerebral hemispheres. Through the notch in the ventral Calvaria Proscn- Telencephaloncephalon Diencephalon Frontal lobe of cerebral hemisphere in anteriorcranial fossaTemporal lobe of cerebralhemisphere in middlecranial fossa. Parietal lobe of certhemisphere Mesencephalon Occipital lobe of cerebral hemisphereTentorium cerebettiPosterior cranial fossa Hum PonsMedulla oblotSpinal cord Fig. 81.—Median sagittal section of the head showing the relation of the- brain to the cra-nium. The sphenoid bone is shown in transparency, and through it the temporal lobe may beseen. border of the tentorium projects the mesencephalon, connecting the rhomben-cephalon below with the prosencephalon above that partition. The cerebralhemispheres form the largest part of the prosencephalon, occupy the anteriorand middle cranial fossa?, and extend to the occiput on the upper surface of thetentorium. The dorsal aspect of the human brain presents an ovoid figure, the largecerebral hemispheres, covering the other parts from view. In the sheeps brain the8 3 THE NERVOUS SYSTEM hemispheres are smaller and fail to hide the cerebellum and medulla oblo
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectnervoussystem, bookye
