AP 2 3.3 Olfactory and Gustatory Systems Flashcards
olfaction
Smell (olfaction) is a special sense and is one of the chemical senses. Olfactory receptors are activated by airborne chemical substances dissolved in fluid on the surface of nasal mucous membranes.
Olfactory nerves
Olfactory nerves (CN 1) are bipolar receptor cells found in the olfactory epithelium on the roof of the nasal cavity. The olfactory nerves travel through the ethmoid bone in a location called the cribriform plate. The dendrites extend from the cell body to the surface of the epithelium where it terminates in the olfactory bulbs, which are paired masses of gray matter
olfactory bulbs,
The dendrites extend from the cell body to the surface of the epithelium where it terminates in the olfactory bulbs, which are paired masses of gray matter In the olfactory bulbs, olfactory nerve axons synapse with other cell bodies of the olfactory pathway.
olfactory tracts
In the olfactory bulbs, olfactory nerve axons synapse with other cell bodies of the olfactory pathway. The axons then travel together from the olfactory bulbs to form the olfactory tracts, which carry information to the temporal lobes. Here, the signals are interpreted in the primary olfaction area as smell.
seven primary odors
Generally, odors can be isolated to seven primary odors: floral (roses), ethereal (dry-cleaning fluid), camphorates (mothballs), musky (perfumes), peppermint (mint gum), pungent (vinegar) and putrid (rotten eggs).
odor interpreted by the brain
Any odor interpreted by the brain is due to a combination of many different chemical substances.
Smell
Smell is defined as a combination of a limited number of primary odors that are detectable by the brain. Animals, such as dogs, have a much wider range of detectable smells and, therefore, have a larger amount of brain space dedicated to smell interpretation. Generally, odors can be isolated to seven primary odors: floral (roses), ethereal (dry-cleaning fluid), camphorates (mothballs), musky (perfumes), peppermint (mint gum), pungent (vinegar) and putrid (rotten eggs).
Gustatory System
The gustatory system is responsible for the special sense of taste. Taste (gustation) is one of the chemical senses because its receptors are activated by chemical substances dissolved in saliva. Taste receptors are inside taste buds mostly on the tongue but are also throughout the mouth and throat.
tongue
The tongue is responsible for gripping food and repositioning it between the teeth, forming it into a compact mass called a bolus. The tongue pushes the bolus back to the pharynx to begin the process of swallowing.
root of the tongue
the root of the tongue is attached to the floor of the posterior surface of the mouth.
apex of the tongue
The apex of the tongue is located anteriorly,
frenulum
The frenulum is located on the inferior surface of the tongue along the midline
papillae
The tongue contains papillae, which are raised bumps on the tongue. There are three types of papillae that help to grip food on the tongue: circumvallate, fungiform, and filiform. Circumvallate and fungiform papillae both contain taste buds
Taste buds
contain chemical receptors that are stimulated by the chemical composition of food. Taste buds are found primarily on the tongue as well as on the surface of the mouth and wall of the pharynx. Taste buds are formed from gustatory cells and supporting cells.
Gustatory cells
are the chemoreceptor cells inside the taste buds. Each gustatory cell terminates in a gustatory hair, which projects into the saliva to detect dissolved chemicals.