nervous system

Question 1

what are the special properties on which the nervous system is based?

Answer 1

sensitivity, conductivity and responsiveness

Question 2

what are the special properties on which the nervous system is based?

Answer 2

sensitivity, conductivity and responsiveness

Question 3

what are nerves? what do they resemble like?

Answer 3

the protolasmic extebnsion of the nerve cells form the neural pathways called the nerves. the nerves resemble like electrical wires. like electric current passes through the wire, impulses areconducted through the nerve.

Question 4

what is the somatic component of PNS?

Answer 4

cerebrospinal nervous system is the somatic component of PNS.
It includes 12 airs of cranial nerves and 31 pairs of spinal nerves.
it innervates the somatic structures of the head and neck, limbs of body wall and mediates somatic sensory and motor functions

Question 5

what is the visceral component of PNS

Answer 5

Peripheral autonomic nervous system is visceral component of the PNS.
INCLUDES VISCERAL OR SPLANCHNIC NERVES THAT ARE CONNECTED TO CNS through the somatic nerve
innervates the viscera, glands blood vessels and nonstriated muscles and mediates visceral functions

Question 6

what are the cell types of the nervous system?

Answer 6

1. excitable cells are the nerve cells or neurons
2. non-excitable cells constitute neuroglia and ependyma in CNS and schwann cells in PNS

Question 7

what isbasic difference between CNS and PNS

Answer 7

in CNS the somatic efferent pathway is made up of one neuron which passes directly into the effector organ ( skeletal muscle)
in PANS the sutonomic efferent pathway is made up of 2 neurons- preganglionic and postganglion, with an intervening ganglion for the rely of preganglionic fibr. effector organ (viscera) is supplied by postganglionic fibre.