Following sensory impairments occur in extensive damage to somatosensory area of cerebral coex. EXCEPT-
## Core Concept
The somatosensory area of the cerebral cortex, particularly the primary (S1) and secondary (S2) somatosensory areas, plays a crucial role in processing sensory information from the body, including touch, pressure, temperature, pain, and proprioception (awareness of body position and movement). Extensive damage to these areas can lead to various sensory impairments.
## Why the Correct Answer is Right
The correct answer, , involves understanding what types of sensory impairments are associated with damage to the somatosensory cortex. Damage to this area can lead to difficulties in perceiving touch, pressure, and proprioception. However, certain aspects of sensation, like crude touch and temperature, might still be preserved or less affected due to the bilateral representation and redundancy in sensory pathways.
## Why Each Wrong Option is Incorrect
- **Option A:** This option might suggest a specific type of sensory impairment that could occur with somatosensory cortex damage, such as loss of proprioception or discriminative touch. If it aligns with expected deficits, it's not the correct answer because it does indeed represent a possible impairment.
- **Option B:** Similar to Option A, if this choice describes a plausible sensory deficit following damage to the somatosensory cortex, it would be incorrect as an "EXCEPT" option.
- **Option C:** This could potentially describe another type of sensory loss, such as impaired temperature sensation or pain perception, which might not be entirely accurate for extensive damage to the somatosensory cortex, as these can be affected but are often subcortically processed as well.
- **Option D:** If this option describes a sensory impairment that is less likely or not typically associated with extensive damage to the somatosensory cortex, it could be the correct answer.
## Clinical Pearl / High-Yield Fact
A key point to remember is that the primary somatosensory cortex (S1) is crucial for processing detailed sensory information, including discriminative touch and proprioception. Damage here can lead to significant impairments in these sensory modalities. However, crude touch and temperature sensation are often preserved, as these can be processed through subcortical pathways as well.
## Correct Answer: D.