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  • Malaysia's leader said on Saturday communications aboard a missing jet were switched off and its course deliberately changed by someone on board before the aircraft disappeared a week ago, but stopped short of saying it had been hijacked.

  • Ukraine braced on Saturday for a breakaway vote in Crimea as deadly violence flared again in the ex-Soviet country's tinderbox east amid the biggest east-west showdown since the Cold War.

  • Finally, the TRS chief K Chandrashekhara Rao has broken his silence over possibility of an alliance with the Congress in Telangana. After saying a firm 'no' to merger with the Congress, KCR has now ruled out any alliance with the Congress in both Assembly and Lok Sabha elections to be held on April 30.

  • The Bharatiya Janata Party's much anticipated list of Lok Sabha candidates is expected shortly which will end the the suspense over who will contest from Varanasi - its prime ministerial candidate Narendra Modi or party veteran Murli Manohar Joshi.

  • The Delhi High Court has confirmed death penalty to all four convicts of the December 16 Delhi gangrape and murder case. The four were convicted in September 2013 for raping and murdering a 23-year-old paramedical student.

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    Home >> Science >> Nervous System

    Nervous System

    The organs which help us to know something about the world around us are called sense organs.

    Iris is the coloured part of the eye.

    Cornea is the main len of the eye and helps to focus.

    The black spot in the centre of the iris is pupil.

    Retina is connected to the brain through optic nerve.It acts as screen on which image is formed.

    Skin is the protective outer covering of the body.It contains nerve endings which detect pain,sweat glands.

    There are four types of tastebuds in the mouth.

    An adult brain weighs about 1.5 kg and contain 14 billion nerve cells.

    Medulla joins the brain to spinal cord.

    Cerebellum is the small part of the brain.

    Cerebrum is the largest part of the brain.

    Spinal cord is a tube which begins from the medulla and goes to the middle of the back.

    Nerves are made up of nerve cells.

    Neurons join together to form nerves.

     

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