Reflex absent in decoicate animal ?
**Core Concept**
The question is testing the understanding of the role of the cortex in the regulation of reflexes. Decortication refers to the removal or damage of the cerebral cortex, which is the outer layer of the brain responsible for processing sensory information, controlling movement, managing higher-level cognitive functions, and facilitating the integration of sensory information to generate appropriate reflex responses.
**Why the Correct Answer is Right**
The correct answer is related to the concept of corticospinal reflexes. The cerebral cortex, particularly the motor cortex, plays a crucial role in the regulation of reflexes, especially those that require complex processing of sensory information. In a decorticate animal, the absence of cortical input leads to an inability to integrate sensory information, resulting in the loss of corticospinal reflexes. This is because the cortex is necessary for the initiation and modulation of these reflexes.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify the type of reflex affected in a decorticate animal. While some reflexes may be affected, the question specifically asks about the reflex absent in a decorticate animal.
* **Option B:** This option is incorrect because it does not accurately describe the effect of decortication on reflexes. While some reflexes may be affected, the question specifically asks about the reflex absent in a decorticate animal.
* **Option C:** This option is incorrect because it does not accurately describe the effect of decortication on reflexes. While some reflexes may be affected, the question specifically asks about the reflex absent in a decorticate animal.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that decortication can lead to a loss of corticospinal reflexes, which are essential for the regulation of movement and posture. This can result in significant motor impairments, including paralysis and loss of reflexes.
**Correct Answer:** B. Deep tendon reflexes