Brain Central Nervous System
Brain Central Nervous System
The central nervous system consists of the brain and the spinal cord.
Brain. This is the highest coordinating centre in the body. It is situated in the head region, in the cranial cavity of the skull. It is soft, whitish organ which weighs 1.2 1.4 kg. It forms 98% of the weight of the whole CNS. Brain is surrounded by three protective membranes called meninges. The space between these meninges is filled with cerebrospinal fluid which protects the brain from mechanical shocks. Brain is divisible into three main regions:
(i) Fore brain (ii) Mid brain (iii) Hind brain
(i) Fore brain forms the greatest part of the brain. It consists of three regions:
(A) Olfactory lobes are a pair of club-shaped small structures present below the cerebral hemisphere. Both lobes are widely separated. Each lobe consists of an olfactory bulb and a narrow olfactory stalk. It is the centre of smell.
(B) Cerebral hemispheres or cerebrum: forms the largest part of the brain. Cerebrum has two cerebral hemispheres which lie side by side and are separated by a deep cerebral fissure. The surface of cerebral hemisphere has grooves (sulci) and folds (gyri) to accomodate larger number of nerve cells.
Each cerebral hemisphere is divided by three fissures into four lobes:
(a) Frontal lobe on the anterior side. This is the region for speech, facial muscular activities and higher mental activities.
(b) Temporal lobe in the lateral region. This is the region for hearing.
(c) Occipital in the posterior region. This is the region for sight and
(d) Parietal lobe in the middle region. This is the region for touch, taste, temperature and conscious association. Internally each cerebral hemisphere has a fluid-filled cavity called lateral ventricles.
(C) Diencephalon: It is the smallest and unpaired part of brain. It lies on the lower side of cerebrum. Ii has a narrow cavity called third ventricle. Its roof is called epithalamus, side are called thalami and floor is called hypothalamus, Pituitary gland is attached by a stalk to the hypothalamus.
(ii) Mid brain : It extends from the pons to the lower portion of the diencephalon. Mid brain is sub divided into
(a) Optic Lobes (b) Crura Cerebri
(a) Optic lobes : - There are four round solid optic lobes called corpora quadrigemina. Anterior optic lobes are centre of vision and posterior lobes arc for hearing.
(b) Crura cerebri : -These are two ventral bands of nerves connecting diencephalon and medulla oblongata.
Each crura cerebri has two swellings, one in the front called superior colliculi and one at the back called inferior colliculi. The four swellings together are called corpora quadrigemina. The superior colliculi are centres for sight reflexes and the inferior colliculi have centres for hearing reflexes.
(iii) Hind brain consists of three parts
(a) Cerebellum is the second Iargest part of the brain. It is made up of two large lateral cerebellar hemispheres and a central vernis. It maintains equilibrium posture and tones of muscles.
(b) Pons : It is located in the centre of brain below the cerebellum. It carries impulses from one hemisphere of cerebellum to other and co-ordinates muscular movements of body.
(c) Medulla oblongata is the posterior most part of the brain which lies below the cerebellum. It continues posteriorly into the spinal cord. It contains a fluid-filled cavity called fourth ventricle. It has centre of respiration, heart beat, vomiting, salivation, sneezing, coughing, swallowing etc.
Bony box within the skull that encloses the human brain is known as _____________ | |||
| Right Option : C | |||
| View Explanation | |||
Which part of the brain is associated with thinking reasoning and intelligence? | |||
| Right Option : A | |||
| View Explanation | |||
The control of blood sugar level, osmoregulation and thermoregulation are the function of | |||
| Right Option : C | |||
| View Explanation | |||
Students / Parents Reviews [20]
Usually we see institutes offering objective based learning which usually causes a lag behind in subjective examinations which is the pattern followed by schools. I think it is really a work of planning to make us students grab the advantages of modes of examination, Objective Subjective and Onli...
Anika Saxena
8thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
Eshan Arora
8thAbhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
Aman Kumar Shrivastava
10thAbhyas is good institution and a innovative institute also. It is a good platform of beginners.Due to Abhyas,he has got knoweledge about reasoning and confidence.My son has improved his vocabulary because of Abhyas.Teacher have very friendly atmosphere also.
Manish Kumar
10thA marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
Archit Segal
7thMy experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Ayan Ghosh
8thMy experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
7thThird consective year,my ward is in Abhyas with nice experience of admin and transport support.Educational standard of the institute recumbent at satisfactory level. One thing would live to bring in notice that last year study books was distributed after half of the session was over,though study ...
Ayan Ghosh
8thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thAbhyas is an institute of high repute. Yogansh has taken admission last year. It creates abilities in child to prepare for competitive exams. Students are motivated by living prizes on basis of performance in Abhyas exams. He is satisfied with institute.
Yogansh Nyasi
7thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thBeing a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
Prisha Gupta
8thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
10thWe started with lot of hope that Abhyas will help in better understnding of complex topics of highers classes. we are not disappointed with the progress our child has made after attending Abhyas. Though need to mention that we expected a lot more. On a scale of 1-10, we would give may be 7.
Manya
8thAbhyas institute is one of the best coaching institute in the vicinity of Ambala cantt.The institute provides good and quality education to the students.The teachers are well experienced and are very helpful in solving the problems. The major advantages of the institute is extra classes for weak...
Shreya Shrivastava
8thIn terms of methodology I want to say that institute provides expert guidence and results oriented monitering supplements by requsite study material along with regular tests which help the students to improve their education skills.The techniques of providing education helps the students to asses...
Aman Kumar Shrivastava
10thWhen I have not joined Abhyas Academy, my skills of solving maths problems were not clear. But, after joining it, my skills have been developed and my concepts of science and SST are very well. I also came to know about other subjects such as vedic maths and reasoning.
Sharandeep Singh
7thIt was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
Cheshta
10thThe experience was nice. I studied here for three years and saw a tremendous change in myself. I started liking subjects like English and SST which earlier I ran from. Extra knowledge gave me confidence to overcome competitive exams. One of the best institutes for secondary education.
Aman Kumar Shrivastava
10thMy experience with Abhyas academy is very nice or it can be said wonderful. I have been studying here from seven class. I have been completing my journey of three years. I am tinking that I should join Abhyas Academy in tenth class as I am seeing much improvement in Maths and English
