A 28-year-old man was seen by a neurologist because he hadexperienced prolonged episodes of tingling and numbness inhis right arm. He underwent a neurologic exam to evaluatehis sensory nervous system. Which of the following cutaneousmechanoreceptors is correctly paired with the type of stimulusto which it is most apt to respond?A. Pacinian corpuscle and rapid vibrationB. Meissner corpuscle and skin stretchC. Merkel cells and slow vibrationD. Ruffini corpuscles and sustained pressure

Receptor Physiology Cutaneous mechanoreceptors respond to mechanical stimuli that result from physical interaction, including pressure, tension, and vibration. Cutaneous mechanoreceptors with small, accurate receptive fields are found in areas needing accurate taction (e.g. the fingertips). In the fingertips and lips, innervation density of mechanoreceptors are greatly increased. Mechanoreceptors found in areas of the body with less tactile acuity tend to have larger receptive fields. With Two-Point Discrimination, you will now observe that the density of touch receptors varies greatly in different parts of the body. Using calipers and a metric ruler, test the subject’s ability to differentiate two distinct points touching the skin at the same time. Have the subject close their eyes. Starting with the face and with the calipers closed, touch the subject’s skin and ask them to indicate if they felt one or two points of contact. Move the calipers apart and again touch the subject with both ends of the calipers at the same time and ask if it was one or two. Continue to do so until the subject indicates that they felt two points of contact and note the distance of the calipers. 13. Two-Point Discrimination Face: Forearm: Neck: Finger:

Identify the nerve that innervates the pronator and most of the flexor muscles of the forearm, most of the thenar muscles and the skin of the lateral side of the palm of the hand.Multiple choice question.Radial nerveUlnar nerveAxillary nerveMedian nerveMusculocutaneous nerveNeed help? Review these concept resources

Question 191 ptsIf a sudden painful stimulus is applied to one of the limbs, which of the following is LEAST likely to follow:Group of answer choicesa rapid flexing of the affected limba rapid extension of the contralateral limbactivation of A-delta nociceptor axons which trigger reflex responsesa rapid flexing of the contralateral limbactivation of C-fibre nociceptors which give rise to a painful sensation that outlasts the stimulus

Patient will verbalize understanding of the temporary nature of numbness and tingling

Which of the following is not one of the the cutaneous senses ?A) HotB) ColdC) Tissue damageD) Pressure: Mechanical deformation of the skinE) Taste