**Core Concept**
Axonotmesis is a type of nerve injury that results from damage to the axons, while the surrounding nerve sheaths and blood vessels remain intact. This injury disrupts the continuity of the axons, leading to a loss of nerve function. The term "axonotmesis" comes from the Greek words "axon," meaning axon, and "tmesis," meaning cut or division.

**Why the Correct Answer is Right**
Axonotmesis occurs due to a severe disruption of the axonal continuity, often caused by a traumatic injury, such as a crush or a laceration. This type of injury can result in a complete loss of nerve function, as the axons are unable to transmit signals. In axonotmesis, the nerve sheaths and epineurium remain intact, but the axons are severely damaged or severed. This leads to a significant loss of motor and sensory function.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, but typically, axonotmesis involves damage to the axons, not the nerve sheaths or blood vessels.

**Option B:** Neuropraxia is a type of nerve injury characterized by a temporary block in nerve conduction, but not a complete discontinuity of the axons.

**Option C:** This option is not provided.

**Clinical Pearl / High-Yield Fact**
Axonotmesis is often seen in injuries where the nerve is stretched or compressed, such as in a crush injury. This type of injury can lead to a significant loss of nerve function, and prompt medical attention is necessary to prevent further damage.

**Correct Answer: D. Discontinuity of axons.**