Identify the labels a, b and c in the neuron diagram.
(A) Dendrite
(B) Schwann Cell
(C) Syneptic Knobe
Show Hint
In most neuron diagrams: Dendrites are near the cell body, Schwann cells surround the axon, and synaptic knobs are located at the terminal ends of the axon.
The given figure represents the structure of a neuron (nerve cell), which is the structural and functional unit of the nervous system. Different parts of the neuron perform specific functions in the transmission of nerve impulses.
(A) Dendrite
The branched projections arising from the cell body are called dendrites. They receive nerve impulses from receptors or other neurons and carry them towards the cell body (cyton).
(B) Schwann Cell
Schwann cells surround the axon and form the myelin sheath in the peripheral nervous system. The myelin sheath acts as an insulating layer and increases the speed of nerve impulse conduction.
(C) Synaptic Knob (Nerve Ending)
The terminal branches of the axon end in swollen structures called synaptic knobs or nerve endings. These contain neurotransmitters that transmit the nerve impulse to the next neuron, muscle, or gland across the synapse.
Summary of the Labeled Parts
Label
Part
Function
A
Dendrite
Receives nerve impulses and carries them to the cell body.
B
Schwann Cell
Forms the myelin sheath around the axon and speeds up impulse conduction.
C
Synaptic Knob (Nerve Ending)
Releases neurotransmitters to transmit impulses to the next cell.
Key Point
The direction of nerve impulse transmission in a neuron is:
