As additional features of the sub-class may be mentioned the absence of a corpus callosum connecting the right and left hemispheres of the brain,[1] and of a fossa in the septum between the two auricles of the heart.
Photomicrograph of section of corpus callosum from case of shell-shock showing the capillary punctate hæmorrhages.
In the brain the cerebellum is completely exposed; the hemispheres are furrowed, but the corpus callosum is rudimentary.
Moreover, the "corpus callosum and the anterior commissure .
The corpus callosum is not formed till after the anterior commissure and fornix.
Rupture of the brain is said to have occurred, and Phayre reports a case in which the left hemisphere was entirely destroyed and changed into a dark gray homogeneous fluid mass, only a small portion of the corpus callosum remaining.
Separate the two halves of the cerebrum, until the corpus callosumis exposed.
Make an incision downward and outward at the junction of the corpus callosum with the cerebrum, and the roof of the lateral ventricles will be cut through and their cavities exposed.
The third ventricle is now examined by cutting through the fornix and corpus callosum at the foramen of Monroe.
They differ from ordinary mammals in having the corpus callosum very small, in being implacental, and in having their young born while very immature.
The kneelike bend, in the anterior part of the callosum of the brain.
Defn: A group of Mammalia, including the marsupials and monotremes; - - so called because the corpus callosum is rudimentary.
It may be mentioned that the owner of this collection declined to accept 1000 guineas for his stock of callosum Sanderae three years after buying the original plant.
In the sulcus between the corpus callosum and the limbic lobe a narrow band of fibres called the cingulum is seen, most of its fibres only run a short distance in it and link together adjacent parts of the brain.
They begin at their antero-ventral part near the genu of the corpus callosum and the anterior pillars of the fornix, and these are the parts which first appear in the lower mammals.
If the anterior half of the corpus callosum be now turned forward, the grey partition, or septum lucidum, between the two lateral ventricles is exposed.
On the surface of the corpus callosum a few fibres, the striae longitudinales, run in the antero-posterior or longitudinal direction (see fig.
If the corpus callosum be now divided about its middle by a transverse incision, and the posterior half of this structure be turned back (see fig.
Such a section will cut the corpus callosum anteriorly at the genu and posteriorly at the splenium, but the body is above the plane of section.
If the corpus callosum be now cut through on each side of its mesial line, the large cavity or lateral ventricle in each hemisphere will be opened into.
As the fibres of the internal capsule run up toward the cortex they decussate with the transverse fibres of the corpus callosum and spread out to form the corona radiata.
This septum fits into the interval between the under surface of the corpus callosum and the upper surface of the anterior part of the fornix.
Hence the corpus callosum is a connecting or commissural structure, which brings the gyri of the two hemispheres into anatomical and physiological relation with each other.
A group of Mammalia, including the marsupials and monotremes; -- so called because the corpus callosum is rudimentary.
Deformity and deficiency of the corpus callosum in some degenerates is but an expression of general defect of associating tracts.
A brain without a corpus callosum is a marked example.
These commissures are of no importance in our study; they assist the corpus callosum in maintaining a close connection between the right and left hemispheres.
There is also a glimpse of the corpus callosum at its anterior end, obtained by pulling the front lobes apart at the median line.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "callosum" in a variety of sentences. We hope that you will now be able to make sentences using this word.
