Nerve ending sensitive to noxious stimuli are present in all except:
**Core Concept**
The question is testing knowledge of **nociceptors**, which are sensory neurons responsible for detecting **noxious stimuli**, such as pain. These nerve endings are present in various tissues throughout the body.
**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss the general concept. Nociceptors are found in skin, joints, muscles, and viscera, allowing the body to respond to harmful stimuli. They are activated by various mechanisms, including thermal, mechanical, and chemical stimuli.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, it's challenging to provide a detailed explanation. However, typically, options that include structures like the **cornea**, **tongue**, or **skin** would be incorrect because these tissues do contain nociceptors.
**Option B:** Similarly, without the specific option, it's difficult to provide a detailed explanation. Options that include **viscera** or **joints** would be incorrect because these also contain nociceptors.
**Option C:** Again, without the specific option, it's challenging to provide a detailed explanation. However, options that include **muscle** or **periosteum** would be incorrect because these tissues also contain nociceptors.
**Option D:** This option might be correct if it includes a structure that does not typically contain nociceptors sensitive to noxious stimuli.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **brain tissue** itself does not contain nociceptors, making it an exception. This is a critical concept in understanding pain perception and the management of pain.
**Correct Answer:** Not provided, but based on the concept, it could be related to **brain tissue**.