In excited nerve fibre, neurilemma is more permeable to `Na^(+)//K^(+)` ions.

Explanation

To solve the question regarding the permeability of neurilemma in excited nerve fibers, we can break it down into the following steps:

### Step 1: Understand the Structure of Neurite
- The neurilemma, also known as the Schwann's sheath, is the outermost layer that surrounds the axon of a neuron. It plays a crucial role in the conduction of nerve impulses.

### Step 2: Define Excited Nerve Fiber
- An excited nerve fiber refers to a neuron that has undergone depolarization. This is a state where the inside of the neuron becomes less negative compared to the outside.

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