Step 1: Understanding the Concept
A neuron has a cyton, dendrons and an axon. Each has its own features.
Step 2: Check the statements
Dendrons are several short tapering processes.
They contain Nissl's granules and neurofibrils, and they carry impulses towards the cyton.
Step 3: Find the wrong one
Lateral branches called collaterals arise from the axon, not from dendrons. So that statement is incorrect.
Final Answer:
The incorrect statement is that dendrons give out collaterals.
\[ \boxed{\text{(D) }\text{They give out lateral branches called collaterals.}} \]