Interbrain-thalamus is a large ovoid mass of gray mater situated obliquely across the dorsal face of cerebral peduncles, so that the two bodies meet in front at a right angle. Medially they are fused to large extent and around this area of adhesion is an annular space called the third ventricle. The dorsal face of […]
Olfactory bulbs Rhinencephalon or Olfactory bulbs are oval elongated structures in each hemisphere, situated at the anteroventral aspect of the frontal pole and are lodged in the olfactory fossae Each bulb receives olfactory nerves coming from the nasal mucosa through the olfactory perforations of the cribriform plate of the ethmoid bone. The olfactory tract is
Hippocampus is an invagination of the cerebral cortex at the lateral ventricle through the hippocampal sulcus. This gyrus curves from the deep face of the piriform lobe around the thalamus and forms the posterior part of the floor of the lateral ventricle. By careful blunt dissection along the posterior horn of the lateral ventricle into
It is the largest mass of commissural fibres that connect the two cerebral hemispheres. The fibres spread out laterally in a radiating manner in the central white mater of each hemisphere. These fibres are crossed by the ascending fibres of the internal capsule. The central part or truncus between the two hemispheres appears as arched
In each hemisphere, the cortical areas have been identified depending on their action. They are The motor area is the anterior and posterior sigmoid gyri which wind round the crucial fissure as their axis. Coronal gyrus contains the somaesthetic area and is located below and lateral to the coronal sulcus. The postsylvian gyrus contains the
The cerebral cortex is made up of numerous convolutions or gyri and is separated by the sulci. The great longitudinal fissure, which lodges the falx cerebri, divides the cerebrum into two equal halves completely. Centrally the fissure extends up to the corpus callosum. The corpus callosum is the connection between the two hemispheres at the median line. Beside the sulci, there
Each cerebral hemisphere consists of Cerebral cortex Basal ganglia or corpus striatum, masses of gray mater embedded within the hemisphere and not visible superficially The rhinencephalon or olfactory part of the brain in the lower part of hemisphere, portions of which can be seen on the ventral surface are olfactory bulb, striae, trigonum olfactorium and piriform
Parts of Forebrain are- Cerebral hemisphere Cerebral cortex Cortical centre of brain Corpus callosum Hippocampus Rhinencephalon / Olfactory bulbs Interbrain-thalamus Pineal body and Hypothalamus Fornix Basal Ganglia or Carpus striatum
The brain is that part of the central nervous system which is situated in the cranial cavity. Its average weight is about 500 grams in the ox, 1.5 kg. in man, 750 grams in horse and 60 grams in dog. When the brain is seen from above, the parts that are visible are cerebral hemispheres,
The brain and spinal cord are enclosed by three membranous coverings for their protection known as the meninges of brain there are three Meninges of brain are present- Duramater Arachnoid Piamater 1. DURAMATER This is a dense, tough membrane of white fibrous tissue. It has cranial and spinal parts which enclose the brain and spinal cord,
