Which of the following developmental reflexes does NOT disappear in a child?
**Core Concept**
The developmental reflexes are a series of involuntary movements that are present in infants and are essential for their development and maturation. These reflexes are mediated by the brainstem and spinal cord and are influenced by the maturation of the nervous system.
**Why the Correct Answer is Right**
One of the developmental reflexes that does not disappear in a child is the **Palmar Grasp Reflex**. This reflex is characterized by a child's involuntary grasp of an object placed in their palm. The palmar grasp reflex is mediated by the median nerve and is present from birth to around 4-6 months of age. However, it does not completely disappear in most children, but rather gradually diminishes and eventually integrates into voluntary motor function.
**Why Each Wrong Option is Incorrect**
* **Option A:** The **Rooting Reflex**, which is characterized by a child's head turning towards a stimulus on the cheek, disappears by around 4-6 weeks of age.
* **Option B:** The **Sucking Reflex**, which is characterized by a child's sucking motion in response to a nipple or other stimulus, disappears by around 4-6 months of age.
* **Option C:** The **Tonic Labyrinthine Reflex**, which is characterized by a child's head turning towards one side in response to stimulation, disappears by around 3-4 months of age.
**Clinical Pearl / High-Yield Fact**
It's essential to note that while the palmar grasp reflex does not completely disappear, it is still an important indicator of neurological development and can be used as a tool for assessing a child's motor and cognitive function.
**Correct Answer:** C.