File:Braune 1877 plate 3.jpg: Difference between revisions

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Plate 3 Obliquely Transverse Head

Only so much is certain, that the optic tract rises up from the chiasma to the corpora quadrigemina considerably more vertically than the optic nerve does to the optic foramen. I was therefore unable to expose the optic nerve thoroughly throughout its entire length, but was obliged to supplement the section by taking off a thin slice of the anterior lobe in order to completely expose the chiasma. Again, a thin layer of fat was removed from the orbit so as to show the entire breadth of the nerve, as the line of section had just missed its upper edge.

It must be further explained that, although the external form of the globe be established, the relations of the lens and iris must be rendered after further sections. The fine dust which even such a thin saw produces was very difficult to remove without causing a change in the relative position of the individual organs of the eye. I therefore froze fresh orbits, sawed through the bones, and then continued the section with a razor. In all cases the eye was thoroughly injected with Thiersch's carmine and glue preparation, in order to give the globe its original expansion. The injection was made from the ophthalmic artery, and in the entirely divided skull which forms PI. Ill, the carotid artery and jugular vein were completely injected with different colours.

It will be noticed from the relations of the brain that the plane of section is obliquely upwards and backwards. In front, owing to the removal of the thin lamina of the anterior lobe, a small portion of the floor of the skull in the region of the crista galli is seen. Behind it are the optic chiasma with a small piece of the optic tract cut obliquely, and further back is a section of the gyrus fornicatus, the superior processes of which lose themselves in the white substance of the cerebrum, and show the small bundles of fibres, the beak-shaped processes which belong to the fornix below.

Externally are the choroid plexuses of the descending cornua. Beneath the white substance of the corpus callosum is a fissure bounded laterally by the optic thalamus and filled up with vessels, and in the middle of it is the pineal body. In this space also is the pia mater passing beneath the corpus callosum to the central portion of the cerebrum. In the middle are the lumina of two large vessels belonging to the great internal veins of the brain, the vense magnse Galeni. These, when followed down with the sound under the splenium to the great veins behind the corpus callosum, and the commencement of the straight sinus, are found to debouch by the two veins here shown. The falx cerebri unites the inferior longitudinal sinus which opens into the straight sinus, with the superior longitudinal which lies further back.

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Reference

Braune W. An atlas of topographical anatomy after plane sections of frozen bodies. (1877) Trans. by Edward Bellamy. Philadelphia: Lindsay and Blakiston.

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Cite this page: Hill, M.A. (2024, June 22) Embryology Braune 1877 plate 3.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Braune_1877_plate_3.jpg

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-{{Braune 1877 header}}
+==Plate 3 Obliquely Transverse Head==
+Only so much is certain, that the optic tract rises up from the chiasma to the corpora quadrigemina considerably more vertically than the optic nerve does to the optic foramen. I was therefore unable to expose the optic nerve thoroughly throughout its entire length, but was obliged to supplement the section by taking off a thin slice of the anterior lobe in order to completely expose the chiasma. Again, a thin layer of fat was removed from the orbit so as to show the entire breadth of the nerve, as the line of section had just missed its upper edge.
+It must be further explained that, although the external form of the globe be established, the relations of the lens and iris must be rendered after further sections. The fine dust which even such a thin saw produces was very difficult to remove without causing a change in the relative position of the individual organs of the eye. I therefore froze fresh orbits, sawed through the bones, and then continued the section with a razor. In all cases the eye was thoroughly injected with Thiersch's carmine and glue preparation, in order to give the globe its original expansion. The injection was made from the ophthalmic artery, and in the entirely divided skull which forms PI. Ill, the carotid artery and jugular vein were completely injected with different colours.
+It will be noticed from the relations of the brain that the plane of section is obliquely upwards and backwards. In front, owing to the removal of the thin lamina of the anterior lobe, a small portion of the floor of the skull in the region of the crista galli is seen. Behind it are the optic chiasma with a small piece of the optic tract cut obliquely, and further back is a section of the gyrus fornicatus, the superior processes of which lose themselves in the white substance of the cerebrum, and show the small bundles of fibres, the beak-shaped processes which belong to the fornix below.
+Externally are the choroid plexuses of the descending cornua. Beneath the white substance of the corpus callosum is a fissure bounded laterally by the optic thalamus and filled up with vessels, and in the middle of it is the pineal body. In this space also is the pia mater passing beneath the corpus callosum to the central portion of the cerebrum. In the middle are the lumina of two large vessels belonging to the great internal veins of the brain, the vense magnse Galeni. These, when followed down with the sound under the splenium to the great veins behind the corpus callosum, and the commencement of the straight sinus, are found to debouch by the two veins here shown. The falx cerebri unites the inferior longitudinal sinus which opens into the straight sinus, with the superior longitudinal which lies further back.
+{{Braune 1877 footer}}