Practical anatomy: a manual of dissections / by Christopher Heath.

  • Christopher Heath
Date:
1870
Catalogue details

Licence: Public Domain Mark

Credit: Practical anatomy: a manual of dissections / by Christopher Heath. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

    533/600 (page 523)
    with the fornix, of which it maj^ be considered to be the posterior peduncle. It is Ji prominent convex body corre- sponding to the dentate fissure, and winds forward to the extremitj' of the cornu. Its anterior extremity is enlarged, and is marked with more or less distinct transverse grooves, and to this part the name Pes Hippocampi (i) has been given, from its fancied resemblance to the foot of an animal. At the anterior border of the hippocampus major is a thin band of white cerebral matter continuous w4th the corpus fimbriatum, but now called the Taenia Hippo- campi (Fig. 238, 2). By lifting this up with the handle of the scalpel and turning it aside, a serrated free border of gray nervous matter will be seen, which has been called the Fascia Dentata (4). This is the gray matter of the convolution which forms the pes hippocampi, as may be seen by making a transverse section of it. The Choroid Plexus of the descending cornu is con- tinuous with the choroid plexus of the lateral ventricle, and can now be seen to be connected with the pia mater through a slit immediately in front of the taenia hippocampi (transverse fissure of Bichat). The Pes Aecessorius or Eminentia Collateralis (Fig. 238, 5) is a projection of variable size at the com- mencement of the descending cornu and between the hippocampus major and the hippocampus minor, corre- sponding to the collateral fissure. By cutting through the fornix opposite [just above] the foramen of Monro, it can be carefully lifted up with the [handle of the] scalpel and turned backward, when some transverse markings on its under surface will be seen (from which it has been called the Lyra,) and the velum interpositum [underneath it] will be brought into view. [By carefully dividing the remaining cerebral tissue connecting the two hemispheres posterioi'ly the great transverse fissure (of Bichat) will be exposed and the entrance of the pia mater by this fissure to form the velum interpositum will be shown.] The Velum Interpositum (Fig. 242,3, p. 531) is a trian- gular process of pia mater carried into the interior of the brain through the great transverse fissure [of Bichat] which is now laid open. The continuity of the pia mater may be traced upon the upper surface of the cerebellum and the under surface of the posterior lobe of the cerebrum, and it may be followed through the descending cornu of the lateral ventricle to the base of the brain, where it appears by the side of the crus cerebri (u. page 510). At each side