Stretch-sensitive receptors in the skin (Ruffini end organs, Pacinian corpuscles, and Merkel cells) help signal postural information and are processed through the:
A) Third-order neurons
B) Dorsal column–medial lemniscus pathway
C) Anterolateral pathway
D) Posterior column of the spinal cord
Ans: B
Feedback:
There are two submodalities of proprioception: the stationary or static component (limb position sense) and the dynamic aspects of position sense (kinesthesia). Both of these depend on constant transmission of information to the CNS regarding the degree of angulation of all joints and the rate of change in angulation. In addition, stretch-sensitive receptors in the skin (Ruffini end organs, pacinian corpuscles, and Merkel cells) also signal postural information. Signals from these receptors are processed through the dorsal column–medial lemniscus pathway. In addition, stretch-sensitive receptors in the skin (Ruffini end organs, pacinian corpuscles, and Merkel cells) also signal postural information. Third-order neurons forward information from the thalamus to the somatosensory cortex. The anterolateral pathway crosses within the first few segments of entering the spinal cord and consists of bilateral, multisynaptic, slow-conducting tracts that transmit information such as pain, thermal sensations, crude touch, and pressure. Lesions affecting the posterior column of the spinal cord impair position sense.
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