A manual of anatomy . a, pons and teg-mental portion of the pons and the midbrain. The oblongata (medulla oblongata) is about i inch ( cm.) inlength and is a connecting link between the spinal cord and highercenters. It is smallest at the spinal cord end and gradually increasesin its dimensions toward its base. At the spinal cord end it meas- THE OBLONGATA 375 ures about lo mm. in both dimensions; at the pontile end it measures17 to 18 mm., transversely, and about 15 mm, dorsoventrally. It isflattened from before backward and is directed nearly vertically,resembling an inverted, flattened,
A manual of anatomy . a, pons and teg-mental portion of the pons and the midbrain. The oblongata (medulla oblongata) is about i inch ( cm.) inlength and is a connecting link between the spinal cord and highercenters. It is smallest at the spinal cord end and gradually increasesin its dimensions toward its base. At the spinal cord end it meas- THE OBLONGATA 375 ures about lo mm. in both dimensions; at the pontile end it measures17 to 18 mm., transversely, and about 15 mm, dorsoventrally. It isflattened from before backward and is directed nearly vertically,resembling an inverted, flattened, truncated cone. It presentsventral, lateral and dorsal areas and certain grooves. The ventral area contains only the pyramid {pyramis, ov fasciculuscerehrospinalis anterior) and is divided longitudinally by the ventro- optic nervg geniculate bodies i „^^^-cerrbral peduncle - inferior guadr/gemlnal, brachium la ttra Ifila ments ofpofis\ portio minor of. \ trigeminal nerve i trigeminal nerve , \ (porllo major) \ pons-. aeonstic nervt-^facial nervB | olive.\ root filaments of vagus^ana glossopharyngeal resiiform body ,medulla oblongatd^ ^ ? pyramid \ i. i^ tuberculum cinereum l>-\root filaments of accessory nerv» ? anterior root filaments of,cervical nerve IIanterior lateral sulcus- posterior lateral sulcusFig, 267.—Brain stem, lateral view. superior quadrigeminalbrachium pineal recesssuperior collicuU trigone of lemniscusinferior colUculi brachium conjunctivumbrachium of pons rhomboid fossa(intermediate portion} ,cuneate tubercle•. fasciculus caneatusposterior intermediate sulcusposterior root filaments of cervical nerve If (Sobotta and McMurrich.) median groove {fissttra mediana anterior) that terminates at the fora-men cecum. This groove is not continuous as it is crossed and in-terrupted by bundles of fibers passing from one side to the otherconstituting the pyramidal decussation {decussatio pyramidum). At alittle distance to the side of the ventromedian groove is an
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthumananatomy, bookyea
