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Essay on Human Brain: The nervous system of man and other group of vertebrates is divided into three main parts: Central nervous system CNS comprising brain and spinal cord.
Peripheral nervous system PNS consisting of cranial and spinal nerves. Autonomic nervous system ANS including sympathetic and parasympathetic nerves.
Central Nervous System C.
Coloured Plate-I and II: It is the most complicated and highly specialized organ of the body. An adult human brain weighs about gms. In a new born baby it is about gms and becomes double after one year and has a volume of about c. It is enclosed in a bony case called cranium which protects brain against external injury.
The brain is being surrounded by three membranes called meninges sing-meninx. At two places the piameter fuses with the thin, dorsal surface of the brain to form choroid plexus. The meninges protect the brain from external shock. The space between duramater and arachnoid is the subdural space and the space between arachnoid and piamater is known as subarachnoid space Fig.
These spaces surrounding the brain as well as the cavities within the brain are filled with a lymphatic fluid, called cerebrospinal fluid CSF. The cerebrospinal fluid is also present within the spinal cord. The cerebrospinal fluid protects the central nervous system from external shock; helps in exchange of nutrients and waste products between the nervous tissue and blood and maintains a constant pressure in and around the brain.
The brain is formed of two types of nervous tissue, Grey matter on the outer side and White matter on the inner side. The former is made of non-medullated nerve cells whereas the latter is formed of medullated nerve cells. The brain or encephalon is a white, bilaterally symmetrical structure.
It is divided into three main parts: Mid brain or Mesencephalon 3. Hind brain or Rhombencephalon Fore Brain: It is the anterior part of the brain and largest among the three parts.
It consists of three parts: The anterior most part of the fore brain is a pair of olfactory lobes.
They consist of an anterior club shaped olfactory bulb and posterior olfactory tract. The cavity of the olfactory lobes or rhinocoel is not well marked. The olfactory lobes are the centers of smell. The cerebral hemispheres or cerebrum is the largest part of the brain occupying about two-third of the entire brain.
It is divided into right and left cerebral hemispheres by a deep longitudinal median groove Fig. These two cerebral hemispheres are connected by a transverse sheet of nerve fibres, called corpus callosum Fig.
The anterior part of corpus callosum is bent slightly downward to form genu while the posterior part is raised upward to form splenium. The cerebral hemispheres are divided by 3 deep fissures into 4 lobes viz. Each lobe has its own specific function.
The frontal lobe has two areas: The parietal lobe or the somaestic area is the centre for the perceptions of sensations like pain, touch and temperature. The occipital lobe has two areas viz. On the ventral side there is a longitudinal fissure called rhinal fissure which separates the hippocampal lobe or pyriform lobe from anterior lobe in each cerebral hemisphere.
Insula or Island of Reil is a small lobe of cerebrum, covered over by parietal frontal, and temporal lobes. It co-ordinates the action of different regions of cerebral hemispheres.Zeitplan hochzeit beispiel essay teaching reflective essay writing work alone or in a group essay fremdlingsfluss beispiel essay republic day essay in odia coates gmu video essay malik shahid ahmed, the man of the house short story essay assignments csi application essay croly the promise of american life summary essay, all animals are equal.
metaphor-organization as a brain Essays: Over , metaphor-organization as a brain Essays, metaphor-organization as a brain Term Papers, metaphor-organization as a brain Research Paper, Book Reports. ESSAYS, term and research papers available for UNLIMITED access. Essay title: Metaphor-Organization as a Brain Each week we learn more about metaphors and organizations.
Of course, the metaphor that describes organizations as machine still is the most easily to understand for me/5(1). Metaphor-Organization as a Brain This Essay Metaphor-Organization as a Brain and other 64,+ term papers, college essay examples and free essays are available now on torosgazete.com Autor: review • February 3, • Essay 4/4(1).
Organization as Brain Essay Sample. If we consider an organization as a brain, than we have to think over the functions and activities of the brain and the relations with the other organs in the body. In the same way the organization also . Mar 03, · Essay on Brain Function Essay on Brain Function Temporal lobes are in the sensory input primary organization.
Temporal lobe seizures can also have serious effects on the personality of the individual. Labels: brain function essay sample, brain function essays, example essay on brain function. Newer Post Older Post Home. .