45. In a blind individual who can read Braille: A) B) C) D) Cortical areas respo

Question

45. In a blind individual who can read Braille: A) B) C) D) Cortical areas responsible for the index finger may increase Cortical areas for all fingers increase Areas responsible for vision extend into the temporal lobe The most noticeable changes occur in auditory cortex 46. Regeneration is: A) B) C) D) The growth of severed axons Limited to the peripheral nervous system in mammals When the cell body of a neuron with a severed axon continues to function All of the above 47. Neurogenesis is: A) A way the nervous system could repair itself following damage B) The birth of new neurons C) Most extensive in the hippocampus and areas near the olfactory bulb D) All of the above sti

Explanation / Answer

45) Answer is D.

Reason: Cerebral Cortex is the largest part of the cerebram in mammalian brain and it plays a main role in memory, attention awareness, thought and language. Most of the sensory infomation is routed to the cerebral cortex via thalamus.

Cerebral cortex based on the function is devided into three parts as below.

a) Visual cortex is responsible for vision

b) Auditory cortex for audition

c) Somato sensory cortex for touch.

46) Answer is C.

Reason: Peripheral nervous system has the abillity to regenerate allowing recovery of funaction after Peripheral nerve damage . Most of the central nervous system axons do not readily regenerate after injury in adult mammals, it has lose the ability to regenerate served axons after a certain point in development.

Example: If a nerve in your finger is served, it can regrow.

47) Answer is D.

Reason: Neurogenesis is a process by which neurons are generated from neural stem cells. Neural stem cells are self renewing, multipotent cells that generates the neurons and alia of the nervous system of all animals during embryonic development. few neural stem cells persist in the adult vertibrate brain and continue to produce neurons throughout life.

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