This drawing shows the typical structures found on a neuron. Pick the alternative that correctly labels the structures in the drawing.
A)1 = dendrites, 2 = cell body, 3 = axon, 4 = myelin sheath
B)1 = axon terminals, 2 = dendrite, 3 = vesicles, 4 = synapse
C)1 = synaptic spines, 2 = glial cell, 3 = ion channels, 4 = node of Ranvier
D)1 = synaptic vesicles, 2 = ion channel, 3 = pons, 4 = axon

Question

This drawing shows the typical structures found on a neuron. Pick the alternative that correctly labels the structures in the drawing. 
A)1 = dendrites, 2 = cell body, 3 = axon, 4 = myelin sheath 
B)1 = axon terminals, 2 = dendrite, 3 = vesicles, 4 = synapse 
C)1 = synaptic spines, 2 = glial cell, 3 = ion channels, 4 = node of Ranvier 
D)1 = synaptic vesicles, 2 = ion channel, 3 = pons, 4 = axon

Quizplus · Accepted Answer

The drawing clearly shows the different structures on a neuron and their typical location. The branching projections are dendrites, the round structure in the center is the cell body or soma, the long projection is the axon, and the white covering around the axon is the myelin sheath. Option B incorrectly labels the dendrite as the axon terminal and adds vesicles and synapse as structures on the neuron which are part of the neuronal communication process. Option C incorrectly labels the synaptic spines as dendrites and adds ion channels (which are present in the membrane of all neurons, not as a structure on the neuron itself) and the node of Ranvier (which is a gap in the myelin sheath along the axon). Option D is clearly incorrect as it mentions the pons, which is a part of the brainstem and not a structure on a single neuron.

This Drawing Shows the Typical Structures Found on a Neuron