. The microscope; an introduction to microscopic methods and to histology. Microscopes. Ch. XI] SERIAL MICROSCOPIC SECTIONS 409 Sagittal Sections § 664. Sagittal sections are those made parallel with the long axis of the body and from the dorsal to the ventral surface, thus dividing the object into equal or unequal right and left (dextral and sinistral) parts. (i) Imbed the animal or embryo with the right side down in the imbedding mass (§612); and arrange the object exactly over the orientation diagram in the bottom of the imbedding box (§657). tmCieddad CmliiYii. Fig. 242. Serial Sagittax Se
. The microscope; an introduction to microscopic methods and to histology. Microscopes. Ch. XI] SERIAL MICROSCOPIC SECTIONS 409 Sagittal Sections § 664. Sagittal sections are those made parallel with the long axis of the body and from the dorsal to the ventral surface, thus dividing the object into equal or unequal right and left (dextral and sinistral) parts. (i) Imbed the animal or embryo with the right side down in the imbedding mass (§612); and arrange the object exactly over the orientation diagram in the bottom of the imbedding box (§657). tmCieddad CmliiYii. Fig. 242. Serial Sagittax Sections Showing the Position of the Embryo IN THE Imbedding Mass, the Connection with the Microtome Holder and THE Arrangement of the Sections on the Glass Slide. Microtome Holder The metal disc and stem for holding the embryo in position while it is being cut. Imbedded Embryo The imbedded embryo in the proper position for sagittal Sections. Sagittal Sections A slide of sagittal sections in the proper position on the slide. I, 2 Serial order in which serial sections are arranged on the slide. In section 2, the word sinistral indicates that the left surface of the section faces directly upward. The right side rests upon the glass. The words cephalic, caudal, dextral and sinistral are inverted under the com- pound microscope, the sections are reinverted, and will appear like this picture, if the book is turned upside down. (2) Mount the block of paraffin containing the embryo so that the right side will be next the disc of the microtome holder. The left side will then be cut first, and look up when mounted (fig. 242). (3) Place in the microtome so that the caudal end will first meet the edge of the knife. (4) Moimt the sections in the order of the print on a page. This will bring the caudal end to the left, the cephalic at the right, ventral aspect up and dorsal down toward the lower edge of the sUde. The dextral face of the section will rest on the sUde, and the sinistral face
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