plz solve 5 ques

plz solve 5 ques functional activity. (a) Cerebellum and Myelin sheath and Hate the functions of the following : (a) Synapse (b) Association neuron (c) Medullary sheath (d) Medulla oblongata (C) Cerebrospinal fluid. (e) Cerebellum

Dear Student

1. a  synapse  is a structure that permits a  neuron  to pass an electrical or chemical signal to another cell.

2. Association neuron also known as interneuron. These neurons are present in brain and spinal chord. They are used to conduct impulses between the neurons for example between afferent and efferent neurons.  

3. A medullary sheath is a protective covering surrounding and insulating certain nerve fibres. Medullary sheath is further composed of two layers; an inner fatty layer called the myelin sheath and an outside cellular layer called the neurilemma or sheath of Schwann cells.  It is essential for the proper functioning of the nervous system. It helps in stimulating the nerve transmission. It acts as an electrical insulator and allows faster and more energetically efficient conduction of nerve impulses. 

4. Medulla Oblongata is the structure found in the human brain. The major function of Medulla Oblongata is to control autonomic functions (that are not in human control) like breathing, respiration, heart Beat. It is also involved in body secretion, reflexes, swallowing, coughing and sneezing actions. Since Medulla Oblongata performs various functions critical to the body, damage to this structure can be fatal. 

5. Cerebellum is associated with regulation and coordination of movement, posture and balance.


Role of cerebrospinal fluid are:

  • It provides the physical support to the brain.
  • Protects the brain tissue from injury.
  • Provides mechanical barrier against shock.
  • Provides lubrication between surrounding bones, the brain and spinal cord.
  • Helps to maintain pressure within the cranium at a constant level, etc.

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