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Answer :
Final answer:
The pathway that performs crossing over in the medulla is the posterior column pathway, which is responsible for transmitting sensory information such as vibration, proprioception, and fine touch.
Explanation:
The pathway that crosses above the medulla is the posterior column pathway. This typically involves sensory information such as vibration, proprioception (body position), and fine touch. The crossing over of signals in this pathway occurs in the medulla, which is a part of the brainstem. On the other hand, the spinocerebellar, anterior spinothalamic and lateral spinothalamic pathways cross over at different places in the central nervous system, not specifically in the medulla.
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The pathway that crosses over in the medulla is the posterior column pathway.
What is the posterior column pathway?
This pathway is responsible for fine touch and discrimination between two points on the body except on the head. It's going to travel from the spinal cord into the thoracic column and also into the brain stem. Its receptors will be mechanoreceptors, which will collect this information.
It has two types of mechanoreceptors: tactile (Meissner's corpuscle, Pacini's corpuscle, free nerve endings) and conscious proprioception (muscle spindles, Golgi tendon organs).
This pathway will be found in the dorsal part of the medulla, as it ascends it will cross the opposite side at the posterior commissure and then continue up to the brainstem.
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