0:14 tissue the nervous system plays a vital
0:17 role in establishing fast communication
0:18 between body
0:21 parts the entire nervous system is made
0:24 of neurons and nervous tissues the
0:26 neuron is made of two
0:29 parts the citon is Broad and also known
0:31 as the cell
0:35 body the axin is long and also known as nervous
0:36 nervous
0:41 fiber cyon or cell body the nucleus can
0:43 be seen in the citon the nucleus is
0:45 surrounded by nissle
0:49 granules the edges of the cyon project
0:51 as dentrites
0:55 axon or nerve fiber it is a long fiber
0:58 of the neuron it is engulfed by a fatty
1:01 myelin layer there is a thin layer
1:04 called neurilemma surrounding the myelin
1:06 between the neurilemma and myelin there
1:10 are Schwan cells nerve impulse nerve
1:12 impulse is the quick transmission that
1:15 occurs in the nervous system this occurs
1:18 in the form of electrochemical flow the
1:21 area between two neuron ends is known as
1:23 axon terminal the relation between the
1:25 neural Junction and transmission is that
1:28 the synaptic Junction between two
1:30 neurons helps the transmission of
1:32 impulse between them the chemical which
1:36 help this transmission are known as
1:38 neurotransmitters neurotransmitters
1:41 carry the transmission up the
1:43 syapse there are two types of cells in
1:49 the nervous system one nerve cell two
1:51 neuroglia the cells which transmit the
1:54 impulse are called nerve cells those
1:56 which don't transmit are known as
2:00 neuroglia nerve cells or neurons these
2:02 are the functional units of the nervous
2:04 system these cells get excited by the
2:07 impulse and transmit or pass it on when
2:10 a neuron is suitably stimulated an
2:12 electrical disturbance is generated
2:14 which swiftly travels along its plasma
2:18 membrane a neuron contains the cell body
2:21 one or more dentrites and an axon the
2:24 neuron is said to have two parts these
2:29 are one cyon or cell body two axon the
2:31 part of the axon not surrounded by the
2:34 Schwan cell and myelin is known as node
2:38 of ranir myelin acts as an electric
2:40 insulator Schwan cells help in the
2:43 production of myelin cell body it is
2:47 known as citon or body it has a lot of
2:50 granules and a large nucleus in the
2:53 cytoplasm the cytoplasm contains nissle
2:56 structures or nissle granules there are
2:59 subtle nerve fibers called lipo fusing granules
3:00 granules
3:03 the cell bodies in the CNS are called
3:05 nucleus while those in the pns are called
3:07 called
3:10 gangal dentrites the small Branch
3:12 structures surrounding the cell bodies
3:14 are known as dentrites they contain
3:18 nissle structures and nerve fibers axon
3:20 the axon is a single long cylindrical
3:23 structure it emerges from a part of the
3:26 cell body known as axen Hill the plasma
3:29 Lemma of the axin is known as axela and
3:33 its cytoplasm is known as axoplasm these
3:35 contain nerve fibers but not nissle
3:38 structures the axon forms collateral
3:41 branches the axon form small filamentous
3:44 structures called Telo dentrites which
3:48 end as synaptic knobs the axon transmits
3:51 the impulse to other neurons and muscle
3:55 fibers the axon bundles in CNS are known
3:58 as tracts while those in the pns are
4:00 known as nerves
4:03 syapse the subtle gap between the axon
4:06 terminal of the previous neuron and the
4:09 dentrite of the next is known as the
4:12 syapse types of neurons based on
4:17 divisions one unipolar nerve cells these
4:19 are sensory cells there is only
4:22 projection from the cell body here this
4:25 divides into two branches one of these
4:28 forms dentrites while the other is the
4:30 axon these are known known as pseudo
4:35 unipolar neurons two bipolar neurons
4:38 here dentrite and axon form directly
4:41 from the cell body they are present in
4:43 the retina of the eye inner ear and in
4:45 the all Factory sensory
4:49 epithelium three multi-polar neurons
4:52 these have an axon and one or more
4:55 dentrites most neurons in our body are
4:58 multipolar types of neurons based on
5:03 myin sheath myelinated axon in the pns
5:06 myelinated axons with Schwan cells
5:09 plasma Lemma around the internal axon
5:11 there is myin sheath in the Schwan cell
5:15 layers cell fluid and nucleus are in the
5:18 outer layer this covering is called
5:20 neurilemma the acellular part of
5:23 myelinated axons is called node of
5:26 ranir most of the white matter in the
5:31 CNS is also made of myelinated axons
5:34 non-myelinated axons they are present in
5:37 Gray matter of the CNS and the
5:41 ANS types of neurons based on function
5:43 Sensory neurons they send the signals
5:46 from the sense organs to the
5:50 CNS motor neurons they transmit signals
5:52 from the CNS to the affectors like
5:57 muscles glands Etc interneurons they are
5:59 present in the CNS they connect the Sens
6:03 sensory axons nerve the axons in the P
6:06 ands form nerves every nerve is covered
6:08 by a thin layer of connective tissue
6:09 known as
6:12 enderium a collection of axons is called
6:16 fasle it is covered by perenium all the
6:18 fices in the nerve form a bundle and are
6:20 covered by the connective tissue
6:23 covering called
Chrome Extension