Write short note on Circulation of cerebrospinal fluid. Write briefly on Neurologlial cells. Describe the structure and functions of nervous tissue Write a short note on the blood supply of spinal cord. Name the parts of brain. Describe briefly about the internal capsule. Draw the diagram of brain and name the parts Explain the structure and functions of cerebellum Name the parts of brain Name the parts of the brain. Describe briefly the external and internal features of each part. Add a note on the blood supply of brain.
Cerebral cortex is composed of nerve cell bodies on the surface – grey matter
Inside the cerebrum are the nerve fibres (tracts) which connect the various lobes – white matter
The afferent and efferent fibres linking the different parts of the brain and spinal cord are:- Arcuate fibres – interconnecting fibres between the different lobes of the same hemispheres Commisural fibres – connecting one hemisphere to the other e.g. corpus callosum Projection fibres – which connect the cerebral cortex to grey matter of lower parts of the brain and the spinal cord e.g. the internal capsule
Hypothalamus – The master control of the autonomic nervous system, parasympathetic and sympathetic. This system stimulates and controls structures such as the heart, most glands and smooth muscles. In effect, this system allows your systems to excite and relax, as needed. This system integrates the autonomic and endocrine functions with behavior.
Hippocampus – This area of the brain, apart from its other functions, is primarily responsible for short term memory.
This area of grey matter lies deep within the cerebral hemispheres
Consist of the caudate nucleus , putamen and globus pallidus .
They are functionally important for controlling voluntary movements and establishing postures .
It influences skeletal muscle tone
When they are altered - say in disorders like Huntington disease or Wilson disease - the person has unwanted movements, such as involuntary jerking movements of an arm or leg or spasmodic movement of facial muscles.
Consists of projection fibres – fibres connecting the cerebral cortex with the lower parts of the brain and the spinal cord
Lies deep within the brain
Between the basal ganglia and the thalamus
All the impulses passing to and from the cerebral cortex are carried by the fibres in the internal capsule
The motor fibres within the internal capsule form the pyramidal tracts (otherwise called the corticospinal tracts) The pyramidal fibres cross to the other side at the level of the medulla oblongata (called decussation )