Scissor reflex is seen in ?
**Scissor Reflex**
**Core Concept**
The scissor reflex is an abnormal reflex seen in newborns, characterized by the adduction of one thigh and the abduction of the other, resulting in a scissoring motion of the legs. This reflex is mediated by the lumbosacral spinal cord and is a sign of lower motor neuron lesion.
**Why the Correct Answer is Right**
The scissor reflex is typically seen in cases of congenital torticollis or spastic diplegia, where there is an imbalance in the tone of the anterior and posterior thigh muscles. The reflex is caused by the overactive adductor and flexor muscles, leading to the characteristic scissoring motion. The reflex is usually bilateral, but can be more pronounced on one side.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the scissor reflex is not typically associated with this condition.
* **Option B:** This option is incorrect because the scissor reflex is not a normal reflex, but rather an abnormal reflex seen in certain neurological conditions.
* **Option C:** This option is incorrect because the scissor reflex is more commonly seen in cases of lower motor neuron lesions, rather than upper motor neuron lesions.
**Clinical Pearl / High-Yield Fact**
The scissor reflex is an important clinical sign that can indicate lower motor neuron lesions in newborns. It is essential to evaluate the reflex in conjunction with other clinical signs to determine the underlying cause.
**Correct Answer: C. Lower motor neuron lesion**