(21) neural control & co-ordination
neural syst- highly specialised cell c/a neurons— detect, recieve & transmit impulse
CNS PNS
brain & spinal cord afferent fibres
organs ⇁⇁⇁⇁ CNS
efferent fibres
CNS ⇁⇁⇁⇁ organs
somatic neural system
CNS ⇁⇁⇁⇁ vol. muscles
autonomic neural system
CNS ⇁⇁⇁⇁ invol. muscles
sympathetic neural syst
parasympathetic neural syst
visceral nervous system
CNS ⇁⇁⇁⇁⇁⇁⇁⇁⇁⇁ visceral org
(21) neural control & co-ordination 1
, neuron
cell body, dendtrite & axon
1. cell body/cyton/soma— has Nissl’s granules
2. dendrite (extension of cell body)— has Nissl’s granules— c/a afferent processes
3. axon— connection b/w cell body & axon terminal— c/a efferent processes
axon hillock— place where axon arises from cyton
4. axon terminal— branched
bulb like structure— c/a synaptic knob— has synaptic vesicles— has chemicals c/a
neurotransmitters
cell body ⇁⇁⇁⇁⇁⇁⇁⇁ synapse/ neuro-muscular junc
unipolar neuron— cell body w/ one axon only
in embryonic stage
bipolar neuron— one axon, one dendrite
in retina of eye
multipolar neuron— one axon, two or more dendrite
(21) neural control & co-ordination 2
, in cerebral cortex
pseudounipolar neuron— single process arises from cyton and then divides into 2 [c/a
stereognosis]
in dorsal nerve root ganglion
non polar neuron— in coelentreta (porifera doesn’t nervous syst)
annelida — bunch of ganglinated neurons
PNS— ganglion
CNS— nuclei
myelinated— enveloped w/ schwann cells— forms myelin sheath around axon— gaps b/w
two myelin sheath c/a Nodes of Ranvier
found in spinal & cranial nerves
(NOR is present only in myelinated neurons)
non myelinated— enveloped w/ schwann cells— doesnt form myelin sheath around axon
found in ANS & SNS)
mylein sheath is formed by oligodentrocytes (CNS) & schwann cells (PNS)
(21) neural control & co-ordination 3
neural syst- highly specialised cell c/a neurons— detect, recieve & transmit impulse
CNS PNS
brain & spinal cord afferent fibres
organs ⇁⇁⇁⇁ CNS
efferent fibres
CNS ⇁⇁⇁⇁ organs
somatic neural system
CNS ⇁⇁⇁⇁ vol. muscles
autonomic neural system
CNS ⇁⇁⇁⇁ invol. muscles
sympathetic neural syst
parasympathetic neural syst
visceral nervous system
CNS ⇁⇁⇁⇁⇁⇁⇁⇁⇁⇁ visceral org
(21) neural control & co-ordination 1
, neuron
cell body, dendtrite & axon
1. cell body/cyton/soma— has Nissl’s granules
2. dendrite (extension of cell body)— has Nissl’s granules— c/a afferent processes
3. axon— connection b/w cell body & axon terminal— c/a efferent processes
axon hillock— place where axon arises from cyton
4. axon terminal— branched
bulb like structure— c/a synaptic knob— has synaptic vesicles— has chemicals c/a
neurotransmitters
cell body ⇁⇁⇁⇁⇁⇁⇁⇁ synapse/ neuro-muscular junc
unipolar neuron— cell body w/ one axon only
in embryonic stage
bipolar neuron— one axon, one dendrite
in retina of eye
multipolar neuron— one axon, two or more dendrite
(21) neural control & co-ordination 2
, in cerebral cortex
pseudounipolar neuron— single process arises from cyton and then divides into 2 [c/a
stereognosis]
in dorsal nerve root ganglion
non polar neuron— in coelentreta (porifera doesn’t nervous syst)
annelida — bunch of ganglinated neurons
PNS— ganglion
CNS— nuclei
myelinated— enveloped w/ schwann cells— forms myelin sheath around axon— gaps b/w
two myelin sheath c/a Nodes of Ranvier
found in spinal & cranial nerves
(NOR is present only in myelinated neurons)
non myelinated— enveloped w/ schwann cells— doesnt form myelin sheath around axon
found in ANS & SNS)
mylein sheath is formed by oligodentrocytes (CNS) & schwann cells (PNS)
(21) neural control & co-ordination 3
