Flashcards in Special senses Deck (103)
What are the 5 special senses?
Where are the special senses all found?
in complex sensory organs in the head
How does stimuli get converted to nerve impulses?
by special senses
What are the 2 categories of senses?
What are the 2 chemical senses?
Where do the chemical senses go and what does this account for?
- project to the cerebral cortex and the limbic system
- meaning chemical senses can evoke emotional responses
What does the olfactory sense do?
dissolved odorants bind to receptor in the nose and sends impulse to cranial nerve 1 (olfactory nerve)
How rapidly does adaptation in the olfactory system take?
- 50% in 1 sec
- complete in 1 min
What is the olfactory epithellium?
area of the ethmoid bone with pores(have axons in them) and 10-100 millianreceptors of smell
What does the olfactory gland do?
The olfactory neurons are the only neurons that do what?
Olfactory neurones bipolar neuron last how long?
What are basal cells in the olfactory nervous system?
What is the gustatory sense?
What kind of substances bind to taste bud on the tongue, soft palate, larynx?
dissolved chemical senses
Where are taste buds?
What are the 5 different classes of taste?
umamin (savory taste)
What are papillae?
taste buds found on sides of vallate and fungiform papillae
- filiform papillae has nothing to do with taste, increases friction
What are taste buds made up of?
- gustatory hairs
- supporting cells
- gustatory receptor cell (life span is 10 days)
- basal cells
How many senses are on each receptor cell of a taste bud?
more than 1 of the 5 tastes
How are nerve impulses generated on the tongue?
dissolved substances bind to gustatory hairs generating a nerve impulse
How quickly does adaptation occur with taste buds?
complete adaptation in 1-5 min
Most senses of taste are actually stimulation of _______ receptors.
What 2 other elements is taste dependant on?
texture and temperature
What are 2 main structure of the eye?
accessory and external structures
What are the accessory structures?
What is the conjunctiva (accessory structure)?
mucosa lining lid covering the front of the eye
What is the palpebra (accessory structure)?
the eyelid which protects and lubricates
Where does the reflex of blinking come from?