Sensory System - Smell Flashcards
Where is the Olfactory Organ?
In the roof of the nasal cavity
The receptor areas of the olfactory system is made of an epithelium that contains 3 kids of cells:
- Olfactory Cells
- Supporting Cells
- Basal Cells
What is the function of the olfactory cells?
to detect odour
How does the olfactory cell detect odour
Cilia that detect odour. The olfactory cells are bipolar neurons that form the first cranial nerve with axons crossing the cribriform plate of the ethmoid bone to reach the olfactory bulb
What is the function of the basal cells of the olfactory system
regenerate olfactory cells every 60 days
The general mechanism is that an odour molecule will activate a metabotropic receptor with yltimately causes opening of Ca+ channels (or closing of K+ channels) to depolarize the cells and generate an action potential
True or False
True
An odour molecule will activate Inotropic receptors
True or False
False
An odour molecule will activate a metabortropic receptor
Each cell will have ___ type of receptor specialized for detection of ___ type of odour.
One receptor for One type of odour
Where is the information transmitted?
Cortex
______ and water-soluble substances stimulate the olfactory cells
volatile
The olfactory cells proect to the Mitral cells of the _____ ______
Olfactory Bulb
The Olfactory Bulb then sends neurons to several areas
True or False
True
The axonal projections (neurons) are sent via the _____ tract
Olfactory Tract
Neurons are sent from the thalamus to the _____ frontal cortex, where smell is percieved
Orbito -
Explain the emotional response to odours
Many odours activate both perception and emotional responses. The sense of smell is responsible for 80% of the favour sensation
Where does the perception of spicy come from
Nocioceptors
