Question

1.Describe the technique for assessing light and dull sensation (Neurological System).

2.Why are tests of vibration and sensation generally tested on the most peripheral parts of the body (Neurological System)?

Answer 1

Techniques for assessing light and dull sensations:

make the patient in a lying position, eyes closed instruct the patient to say" sharp, light, or dull" when they feel respective objects. usually using objects is a small brush, cotton, pin, etc..

With the patient's eyes closed, alternate touching the patient with the needle and the brush or cotton at intervals of roughly 5 seconds.

instruct the client to tell the physician if they felt a difference in the strength of sensation on each side of their body.

do alternate between pinprick and light brush touch, Touch one body part followed by the corresponding body part on the other side. This allows the client to compare the sensations and note asymmetry.

Vibration test:

the vibration test is done by using a toning fork, vibratory sensations usually lost in peripheral neuropathy and spinal cord diseases.

There are four known types of mechanoreceptors whose only function is to perceive indentions and vibrations of the skin: Merkel’s disks, Meissner’s corpuscles, Ruffini’s corpuscles, and Pacinian corpuscles. The most sensitive mechanoreceptors, Merkel’s disks, and Meissner’s corpuscles are found in the very top layers of the dermis and epidermis and are generally found in non-hairy skin such as the palms, lips, tongue, soles of feet, fingertips, eyelids, and the face. for this reason tests of vibration and sensation generally tested on the most peripheral parts of the body.