Corpora quadrigemina...

Corpora quadrigemina

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The dorsal portion of the midbrain consists of four rounded bodies called corpora quadrigemina which acts as a reflex centre for vision and hearing.

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Read the given passage and answer the questions that follows: Rhodinus, a blood-sucking bug, shows five instars before it metamorphoses into an adult. It ahs a very long head with the brain located at tip and an organ called Corpora Cardiaca (C C) behind it. The hormone that ensures the continuum of the juvenile stages is called a juvenile hormone. Behind the head is a pro - thoracic gland, which gets triggered by the Pro - Thoracico - Tropic Hormone (PTTH) to release ecdysone required for molting into an adult. The following observations were made when the juveniles of this insect were subjected to various conditions : 1. Starved juveniles (any instar) when decapitated rarr remained juveniles and did not molt into adults. 2. Well-fed juveniles (any instar) when decapitated rarr molted into adults. 3. Starved juveniles (any instar) when partially decapitated to remove the brain cells rarr remained juveniles and did not molt into adults. 4. Well - fed juveniles (any instar) when partially deitated to remove the brain cells rarr did not molt into adults. If an unfed, completely decapitated, fth (final) instar juvenile is connected to a well-fed, decapitated fourth instar juvenile by a glass tube so that fluids can be exchanged, what whill be the expected result ?

PREMIERS PUBLISHERS-NEURAL CONTROL AND CO-ORDINATION -Other Important Question & Answers (II. Answer the following:)

What are the three meanings of the brain? Where are they present
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Write an account on the structure and function of forebrain.
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Corpora quadrigemina
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Given an account on the different areas of hindbrain region.
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What are the fluid filled spaces of the brain called? Write few lines ...
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Explain C.S of spinal cord with neat diagram.
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(i) Describe the structure of spinal cord. (ii) What are heart sound...
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In what way the grey and white matter of the brain and the spinal cord...
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When dust falls in our eyes, the eyelids close immediately not waiting...
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What are the functional components of a reflex arc? Explain.
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Explain the type of reflexes.
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What is peripheral nervous system?
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Write about cranial nerves which are arising from the brain coming und...
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How many spinal nerves emerged from the spinal cord and how are they n...
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What is somatic neural system? Write its functions.
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What is ANS ? Explain the components of ANS.
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Name the neural systems coming under autonomic system.
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Differentiate between sympathetic and parasympathetic Neural system.
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Name the senses occur in our brain.
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Classify receptors based on their location.
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