Moro’s reflex is initiated by:
**Core Concept**
Moro's reflex, also known as the startle reflex, is a **neurological reflex** present in newborns. It is characterized by a distinct sequence of movements in response to a sudden loss of support or a loud noise. This reflex is an important indicator of **central nervous system** integrity.
**Why the Correct Answer is Right**
Since the correct answer is not provided, I will explain the general mechanism. Moro's reflex is typically initiated by a sudden loss of support or a loud noise, which stimulates the **vestibular apparatus** and **auditory receptors**. However, without the correct answer choice, let's consider a common initiator: a sudden movement or loss of support that stimulates the **proprioceptors** in the neck and back, leading to the reflexive movement.
**Why Each Wrong Option is Incorrect**
**Option A:** Without knowing the specific answer choice, it's difficult to provide a detailed explanation. However, any option that does not involve a sensory stimulus or sudden change in the environment is likely incorrect.
**Option B:** Similarly, without the specific text, we can't assess its accuracy, but if it doesn't relate to sensory input or environmental change, it's probably wrong.
**Option C:** This option would be incorrect if it doesn't align with the known initiators of Moro's reflex, such as sensory stimulation or loss of support.
**Option D:** If this option suggests an internal stimulus unrelated to sensory input or environmental change, it would be an incorrect choice.
**Clinical Pearl / High-Yield Fact**
Moro's reflex is an important **neonatal reflex** that typically disappears by 4-6 months of age. Its presence or absence can be a useful indicator of neurological development or potential issues.
**Correct Answer:** Not provided in the query.