Plate II

Grafik

In this Plate the hemispheres of the Cerebrum are so cut as to show the Corpus Callosum, the distinction of medullary and cincri- tious substances, the manner in which the Pia Mater descends be- twixt the convolutions of the Brain, and the Centrum Ovale. To do this, we have endeavoured to divest the Brain entirely of the Dura Mater; first, by cutting the Dura Mater round the margin of the bone; and then by separating the hemispheres a little, and freeing the Falx from its adhesions to the Crista Gali, of the cethnoid bone, and folding it backwards, it being still left attached to the .Tentorium. Then the level of the Corpus Callosum being observed, the incision is to be made horizontally, and nearly on the same plane. a. The integuments of the head laid down over the ears and face. b. The Temporal Muscle. c. The Circle of the Cranium. d. The Dura Mater, which invested the Cerebrum and formed the Falx, or partition betwixt the hemispheres, thrown back. e. e. f. The Cineritious Substance, which is seen like a stained part of the Brain, as if penetrating a little way, and following the infraetuosities of the surface. g. The Medullary Part of the Brain. Upon this left side the knife was not carried so deep, nor upon the level of the Corpus Callosuni. The consequence of this is, that the central medullary part is completely surrounded with the cortical or cineritious substance, and therefore it forms a distinct centre of medullary substance, which makes Vicq. d'Azyr call it—" Centre ovale lateral, ou petit centre ovale." But it will be observed, that on the other side, there being a deeper section made, there remains no cineritious matter on the inner margin of the hemisphere ; so that if the right hemisphere should be cut to the same level, the Corpus Callosum would be the centre of a uniform mass of white medullary matter, viz. The Centrum Ovale Vieussenii. h. h. The Pia Mater passing into the interstices of the convolutions of the Brain, to support and nourish its substance. i. i. The Corpus Callosum1, or Commissura Magna Cerebri. This is the white body which we see upon separating the hemispheres, and looking down into the centre of the Brain. It forms a medullary arch, covering the two lateral ventricles nearly in the same way that the Fornix lies over the third ventricle; or rather, perhaps we should say, in the manner in which it is said to lie. It is firm, and we may observe the appearance of transverse lines passing from the one hemisphere to the other. k. The Longitudinal Medullary Lines of the Corpus Callosum, and betwixt these is the Rapha, or Furrow.

Angaben zum Objekt

• Sprache: Englisch
• Standort: Universitätsbibliothek Heidelberg
• Inventarnummer: P 1242-4 Folio RES
• Sammlung: UB Anatomische Illustrationen

Klassifikation und Themen

• Bezug (was): Anatomie ; Gehirn ; Illustration
• Bezug (wer): Bell, Charles (Thematisierte Person/Körperschaft (GND))
• Klassifikation: Stich (Gattung)

Beteiligte, Orts- und Zeitangaben

• Ereignis: Herstellung
• (wer): Bell, Charles (Zeichner/Zeichnerin) ; Medland, Thomas (Kupferstecher/Kupferstecherin)
• (wo): London
• (wann): um 1802
• Ereignis: Veröffentlichung
• (wer): Longman
• (wann): 1802
• Ereignis: Veröffentlichung
• (wo): London

Weitere Informationen

• Letzte Aktualisierung: 06.03.2023, 09:55 MEZ