An__ is a molecule defined by its physicochemical characteristics and is capable of being translated by the nervous system into the perception of a smell.

odorant

Which of the following is the translation of a chemical stimulus into a smell sensation?

odor

The ___ is a narrow space at the back of the nose into which air flows and where the main olfactory epithelium is located.

olfactory cleft

_____ are the precursor cells to olfactory sensory neurons.

Basal cells

___ is the total inability to smell, most often resulting from sinus illness or head trauma.

anosomia

The brain region responsible for processing smell is known as the ___.

primary olfactory cortex

The limbic system is a group of neural structures that is involved in many aspects of ___.

emotion and memory

Whys is olfacttion unique among all of the senses in terms of its neural wiring?

it has direct connection to the limbic system

Sometimes odorants can stimulate the somatosensory system through polymodal nocieceptors. These sensations are mediated by the ___, which transmits information about the "feel" of an odorant.

trigeminal nerve

Cutting onions makes you cry because chemicals in the onions ___.

create a burning sensation via the trigeminal nerve