**Question:** Tober Ayer test is positive in:

**Core Concept:** The Tober-Ayer test is a clinical test used to assess the function of the deep tendon reflexes (DTRs) in the spinal cord. The test involves tapping the posterior tibial nerve near the ankle joint, which stimulates the reflex arc and results in a knee jerk reflex.

**Why the Correct Answer is Right:** The Tober-Ayer test is positive when the knee jerk reflex is present and symmetrical on both sides of the body. This indicates that the afferent limb (nervous system) and efferent limb (muscular system) of the reflex arc are functioning normally. A positive result suggests intact spinal cord function and is crucial for assessing the integrity of the spinal cord.

**Why Each Wrong Option is Incorrect:**

A. False: The Tober-Ayer test is performed to assess spinal cord function and does not directly evaluate other organ systems or conditions.
B. False: This option combines two unrelated aspects (muscle power and deep tendon reflexes) and does not address the primary purpose of the Tober-Ayer test.
C. False: While muscle power may be affected in some spinal cord disorders, the Tober-Ayer test specifically assesses spinal cord function through deep tendon reflexes.
D. False: The Tober-Ayer test is performed to assess spinal cord function, not to evaluate sensory function.

**Clinical Pearl:** The Tober-Ayer test is a rapid and simple method to assess spinal cord health in neurological examinations. A positive result indicates normal spinal cord function, while a negative result may indicate cord dysfunction or trauma. This test is essential for diagnosing and monitoring the progression of spinal cord disorders, such as multiple sclerosis or spinal cord injury, and assessing response to treatment.