Question

120 minutes to take it. Question 33 2 pts Odor signals carried by the dorsal path primarily go to the frontal lobe and are involved in identification and complex reactions. o travel to the amygdala for emotional responses O go to the frontal lobe and hippocampus and are involved in identification, recall, and complex reactions. bypass the frontal lobe and go to the piriform cortex.

Answer 1

D

Each olfactory bulb (right and left) lies lateral to the crista galli and superior to the cribriform plate of the ethmoid bone, inside the cranial cavity. Therefore, it lies on the underside of medial aspect of the frontal lobe. Within the olfactory bulb are bundles of nerve fibers known as glomeruli; where incoming receptor cell axons make connections with the dendrites of mitral relay neurons.

This bundle of nerve fibers is made up of the axons of mitral relay neurons bound for the regions of the brain associated with the olfactory cortex. The tract passes posteriorly on the underside of the medial frontal lobe in a sulcus known as the olfactory groove.

This cortex is not a single structure, rather, it is defined as the combined areas of the cerebral cortex (generally within the temporal lobe) that receive input directly from the olfactory bulb. These regions include the:

• Piriform cortex: which is located below the lateral olfactory stria.
• Amygdala: which is located anterior to the temporal/inferior horn of the lateral ventricle, and is associated with the emotion of fear.
• Entorhinal cortex: which is the anterior part of the parahippocampal gyrus, and is involved in the formation of memory.