which of the following nerve fiber types is not found in human spinal nerves
Answer (1)
So, while their function exists in spinal pathways, the "Type I" designation itself isn't used in spinal nerves.In human spinal nerves, all sensory and motor fibers are typically either A, B, or C fibers, classified based on diameter, conduction velocity, and function. However, nerve fiber type I (specifically Ia and Ib fibers) is not found in spinal nerves as a classification system — it belongs to a different system used for sensory fibers of the muscle spindle and Golgi tendon organs.Example of a nerve fiber type not found in spinal nerves (using classification mismatch):Type I fibers (Ia and Ib):Found in cranial nerves and muscle afferents, but not classified in the spinal nerve fiber system (which uses A, B, C types).Function: Proprioception (muscle spindle and tendon organs).Equivalent to: A-alpha fibers, but they aren't labeled as "Type I" in spinal nerves.
