**Question:** Hung-up reflexes are seen in

A. Spinal cord injuries
B. Brainstem strokes
C. Cervical spondylosis
D. Amyotrophic lateral sclerosis (ALS)

**Core Concept:** Hung-up reflexes, also known as exaggerated or superficial reflexes, are an abnormal response to a reflex stimulus. They are typically observed in conditions affecting the spinal cord, brainstem, or peripheral nerves.

**Why the Correct Answer is Right:** Hung-up reflexes are often seen in Duchenne Muscular Dystrophy (DMD), which is a neuromuscular disorder affecting the spinal cord and peripheral nerves. In DMD, the spinal cord and peripheral nerves become damaged, leading to increased reflex excitability.

**Why Each Wrong Option is Incorrect:**

A. Spinal cord injuries (SCI) generally result in hypoactive or abolished reflexes due to cord damage, not hyperactive reflexes.
B. Brainstem strokes typically cause a loss of reflexes rather than an exaggerated response.
C. Cervical spondylosis, a degenerative condition affecting the spine, does not consistently lead to hung-up reflexes.

**Clinical Pearl:** Hung-up reflexes are a helpful clinical sign, often used to diagnose Duchenne Muscular Dystrophy. However, this phenomenon should be interpreted in conjunction with other clinical findings, as each option listed can also present with exaggerated reflexes for different reasons.

**Core Concept:** Reflexes are involuntary responses triggered by specific stimuli, such as a pinprick or joint movement. They involve the sensory receptor, sensory neuron, spinal cord, motor neuron, and muscle.

**Why the Correct Answer is Right:** In Duchenne Muscular Dystrophy (DMD), the loss of motor neurons and progressive muscle weakness result in exaggerated reflexes due to decreased muscle resistance to the reflex stimulus.

**Why Each Wrong Option is Incorrect:**

A. Spinal cord injuries (SCI) lead to hypoactive or abolished reflexes, not hyperactive reflexes.
B. Brainstem strokes cause various neurological deficits, but exaggerated reflexes are not a common feature.
C. Cervical spondylosis typically results in radicular symptoms rather than reflex abnormalities.