Steps Involved In Working Of Sensory Receptors Of Skin And Urinary Bladder

The dermis, or the inner layer of the skin, contains various types of receptors that play a crucial role in our sensory perception, including touch, pressure, pain, and temperature.

 

Meissner's Corpuscles

These touch receptors are located closer to the surface of the skin and are found in papillae that extend into the ridges of the fingertips. They are encapsulated endings consisting of spiral and twisted nerve endings that end in a knob-like structure.

 

Pacinian Corpuscles

These are pressure receptors located deep in the dermis. They are also encapsulated neuron endings and are believed to be involved in the perception of vibrations, particularly in the limbs.

Some researchers suggest that Ruffini End Organs may function as heat receptors, while End Bulb of Krause may serve as cold receptors.

The distribution of these receptors on the body surface is not uniform. For example, pain receptors are much more abundant than cold receptors, with a ratio of 27 to 1. Cold receptors are about 10 times more abundant than heat or temperature receptors. Additionally, the density of receptors varies in different areas of the body, with fingertips having a higher abundance of touch receptors compared to the skin on the back.

In the context of the urinary bladder, as it fills with urine, sensory impulses are transmitted to the spinal cord and then to the brain, signaling the urge to void. However, the brain has the ability to override this urge. When voiding occurs, excitatory impulses are sent through involuntary nerves to the bladder, causing it to contract, and to the internal sphincter, which opens. Involuntary impulses also reach the external sphincter, which opens to allow urine to be expelled.

Sensory Receptors In The Human Skin 

Sensory receptors in the skin and urinary bladder help us to sense things like pressure, touch, temperature, and pain. These receptors are like tiny sensors that send signals to our brain, telling us what is happening in our body.

When we touch something, for example, pressure-sensitive receptors in our skin are activated. These receptors are located in the dermis, which is the layer of skin just below the surface. The receptors respond to changes in pressure and send signals to the brain, which interprets the information and lets us know what we are touching.

Similarly, when we feel heat or cold, temperature-sensitive receptors in the skin are activated. These receptors are also located in the dermis and respond to changes in temperature by sending signals to the brain. This is how we are able to sense whether something is hot or cold.

In the urinary bladder, there are different types of sensory receptors that are responsible for sensing different things. For example, there are stretch receptors that sense when the bladder is getting full and needs to be emptied. There are also receptors that sense pain or discomfort, which can be a sign of an infection or other problem.

When these receptors are activated, they send signals to the brain via nerve fibers. The brain then interprets these signals and sends messages back to the bladder, telling it when to contract and empty, or when to relax and hold urine.