Question

a sensory signal traveling from the thumb to the cns will pass a few checkpoints. which of the following lists the order of the checkpoints passed? a) dorsal root, ventral root, dorsal ramus, brachial plexus, receptor b) receptor, ventral ramus, spinal nerve, brachial plexus, ventral root c) dorsal root, spinal nerve, dorsal ramus, brachial plexus, receptor d) receptor, brachial plexus, ventral ramus, spinal nerve, dorsal root

Explanation:

Sensory signals start at the receptor in the thumb. They travel through the brachial plexus (a nerve network for the upper limb), then the ventral ramus (which supplies the anterior/lateral body, including the thumb), join the spinal nerve, and enter the CNS via the dorsal root (sensory input pathway). Other options have incorrect order (e.g., starting with roots instead of receptors, mixing motor/ventral roots for sensory signals).

Answer:

d) Receptor, brachial plexus, ventral ramus, spinal nerve, dorsal root