**Core Concept**
Orthodromic conduction refers to the normal, forward direction of nerve impulse propagation along the length of a neuron, from the dendrites to the axon terminals, allowing for the transmission of signals from one neuron to another.

**Why the Correct Answer is Right**
Orthodromic conduction is the primary mechanism of neuronal signaling and is essential for various physiological processes, including muscle contraction, sensory perception, and autonomic regulation. This process relies on the coordinated action of voltage-gated ion channels, particularly sodium and potassium channels, which generate and propagate action potentials along the axon. The proper functioning of these channels ensures the efficient transmission of signals in the forward direction.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, but typically, reverse conduction (or antidromic conduction) would be the incorrect answer, where the action potential travels in the opposite direction, usually as a result of external stimulation.
**Option B:** Retrograde conduction, often associated with the transport of substances within neurons, is not directly related to the forward transmission of signals.
**Option C:** Transverse conduction refers to the spread of action potentials across a nerve, but it is not the same as orthodromic conduction, which involves the sequential activation of neurons along a pathway.

**Clinical Pearl / High-Yield Fact**
Understanding orthodromic conduction is crucial for appreciating the pathophysiology of various neurological disorders, such as demyelinating diseases (e.g., multiple sclerosis), where the disruption of normal conduction can lead to aberrant signal transmission.

**Correct Answer:** D.