The diagram given below shows the internal structure of a spinal cord

Human Physiology (10)

The diagram given below shows the internal structure of a spinal cord depicting a phenomenon. Study the diagram and answer the questions:

  1. Name the phenomenon that is depicted in the diagram. Define the phenomenon.
  2. Give the technical term for the point of contact between the two nerve cells.
  3. Name the parts numbered 1, 2 and 3.
  4. How does the arrangement of neurons in the spinal cord differ from that of the brain?
  5. Mention two ways by which the spinal cord is protected in our body.

Answer

  1. Reflex action, /Simple reflex/Reflex act
    It is an automatic, [spontaneous, quick] involuntary response to a stimulus.
  2. Synapse
  3. 1. Sensory neuron / afferent fibre/Axon of sensory neuron                                                                                                 2. Motor neuron / efferent fibre/Axon of motor neuron                                                                                                      3. Grey matter/central canal
  4. Spinal Cord – Cytons in the inner grey matter and axons in the outer white matter. /Cytons are inside & Axons are outside                                                                                                                                                                                Brain – Cytons in the outer grey matter and axons in the inner white matter. /Cytons inside, Axons outside
  5. Meninges, Cerebrospinal fluid, Vertebral column / backbone.
  • Exam Year: 2018