The anatomy of the nervous system, from the standpoint of development and function . Isthmus- Cerebellum MetcnccphalonRhomboid fossaMyclcncephalon . tic Hypo-/chiasma physis Medulla Lamina terminalis / ^Hyp^ihaiamus oblon^ataRhincnccphalon - Spinal cordCentral canal Fig. 17.—The brain of a fetus of the third month in median sagittal section. (His, Sobotta.) of mm., are well defined by the third month (Fig. 17). In transversesections this division of the embryonic brain is seen to be composed of a pair ofplates on either side, which with a roof and floor form the walls of the ventricle. Ro
The anatomy of the nervous system, from the standpoint of development and function . Isthmus- Cerebellum MetcnccphalonRhomboid fossaMyclcncephalon . tic Hypo-/chiasma physis Medulla Lamina terminalis / ^Hyp^ihaiamus oblon^ataRhincnccphalon - Spinal cordCentral canal Fig. 17.—The brain of a fetus of the third month in median sagittal section. (His, Sobotta.) of mm., are well defined by the third month (Fig. 17). In transversesections this division of the embryonic brain is seen to be composed of a pair ofplates on either side, which with a roof and floor form the walls of the ventricle. Roof plate (with chorioid plexus) ? ^j^\.Alar plate or ThalamusSulcus limitansBasal plate or Hypothalamus Mammillary recess Fig. 18.—Transverse section through the diencephalon of a mm. embryo. (His, Prentiss- Arey.) (Fig. 18). The dorsal lamina is known as the alar plate, the ventral as the basalplate. On either side these meet at an angle, forming the sulcus limitans. Theselaminae and the sulcus limitans between them can be traced back through the I 111 Ml RAL I 1 BE AND I rS DERIVA1 1\ ES 35 mesencephalon and rhombencephalon into the spinal cord. The thalamus isproduced by a thickening in the alar lamina and i> separated from the hypo-thalamus by the sulcus limitans, which can be traced as far as the optic rerostral to the ridge produced by the optic chiasma. The hypothalamus1 represents the basal lamina and gives rise to the tuberCtnereum, posterior lobe of the hypophysis, and the mammillary bodies. From thedorsal edge of the alar lamina. \\ here ihis is attached t<
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectnervoussystem, bookye
