What are neurofibrils? Give their functions.

Explanation

**Step-by-Step Solution:**

1. **Definition of Neurofibrils**: Neurofibrils are thread-like structures found in the cytoplasm of nerve cells, particularly near the cytons (cell body) and dendrites of neurons. They are primarily composed of neurofilaments and are important components of the neuronal cytoskeleton.

2. **Location**: Neurofibrils are predominantly located in the cytons of neurons, which are the parts of the neuron that contain the nucleus and cytoplasm. They are also found in the dendrites, which are the extensions of the neuron that receive signals from other neurons.

3. **Structure**: When observed under an electron microscope, neurofibrils appear as fine, thread-like structures. They are part of the afferent nerve fibers, which are responsible for carrying sensory signals towards the central nervous system.

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