Plate VIII

Grafik

The two figures of this Plate show more particularly the relation of the Fornix, the Communication of the Ventricles, the Plexus Choroides, and Velum Interpositum, or Toile Choroidiene, by a perpendicular section. f. f. g. g. h. 12. Have here the same references as in the last Plate i. The under surface of the Corpus Callosum, where it appears like a vault over the lateral Ventricles. k. The Septum Lucidum, or partition betwixt the upper part of the lateral Ventricles. l. The under surface of the Fornix, which is called Psalterium, or Lyra. The Fornix lies over the third Ventricle like a vault, say the older writers, they representing it as defending this cavity from the incumbent weight of the Brain ; but it rests upon the Thalami Nervorum Opticorum, while there intervenes the Vascular Velum ; and it does not lie loose, but adheres to this Velum, while the Velum again adheres to the Thalami Nervorum Opticorum; therefore there can be no communication in all this space betwixt the lateral and third Ventricles, or betwixt the right and left lateral Ventricles. The only communication is at the most anterior point, where there is a free space under the anterior Crura of the Fornix. m. The Posterior Crus of the Fornix of the left side, cut in making the section. n. The fore part of the Fornix. o. The free space before the union of the Plexus Choroides, or termination of the Velum, and under the anterior part of the Fornix. p. A Thread holding out the Plexus Choroides of the left Ventricle. q. The Section of the Corpus Striatum of the left side, over which the Plexus is represented hanging. r. The Velum Interpositum, adhering above to the Fornix, and below to the Thalamus Nervi Optici; at the same time the manner of its terminating in the Choroid Plexus may be observed. The Plexus is separated for a considerable length, and left only in its natural attachment on the fore part. S. The Vein stretching from under the anterior Crus of the Fornix, and under which is the communication betwixt the Ventricles. Figure II In this figure the letters h. i. k. l. m. s. have the same reference as in Fig. 1.—This figure is given to illustrate the manner in which the communication betwixt the Ventricles is formed, by the abrupt termination of the Velum under the Fornix. N. The Velum of Haller, stretching forwards under the Fornix, O. A little portion of the Choroid Plexus of the left Ventricle left hanging. p. The termination of the Velum forwards, while we see, below, the last tack of its adhesions to the Corpus Striatum, and the Plexus as if terminating in it, but really uniting with that of the other side to form a small Plexus, which runs upon the lower surface of the Velum. q. The Cavity of the Third Ventricle, formed on the two sideby the Thalami Nervorum Opticorum. r. A Pin introduced from the opening under the anterior Crus of the Fornix, from the lateral Ventricle of the left side into the third Ventricle. It is to be observed, that if the Pin had been directed more transversely, it would have gone into the lateral Ventricle of the right side, from the circumstance of this being a communication common to all the three Ventricles, by the manner in which the Fornix lies over this free space. t. The Infundibulum. x. The Optic Nerve of the left side remaining; that part of the Brain to which it belongs having been necessarily taken away in making the section. y. The Pituitary Gland. z. The Internal Carotid Artery.

Object Details

• Location: Universitätsbibliothek Heidelberg
• Collection: UB Anatomische Illustrationen
• Inventory number: P 1242-4 Folio RES
• Language: Englisch

Classification and Topics

• Classification: Stich (Gattung)
• Subject (what): Anatomie ; Gehirn ; Illustration
• Subject (who): Bell, Charles (Thematisierte Person/Körperschaft (GND))

Contributors, Places and Time

• Event: Herstellung
• (who): Bell, Charles (Zeichner/Zeichnerin) ; Medland, Thomas (Kupferstecher/Kupferstecherin)
• (where): London
• (when): um 1802
• Event: Veröffentlichung
• (who): Longman
• (when): 1802
• Event: Veröffentlichung
• (where): London

Further information

• Last update: 26.03.2025, 9:43 AM CET