14 terms

anP Taste, smell, and touch

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olfaction
ability to detect chemicals in the air
nose
warms and filters the air
transmits chemicals in the air to the olfactory epithelium;
located at the roof of the nasal cavity
olfactory epithelium
membrane
produces mucus that dissolves chemicals
is c. 10 cm in area
only neuron in the body that can regenerate
olfactory receptors
bipolar neurons that have cilia at one end and an axon on the other
cilia are stimulated by odor molecules and transmit this information to the olfactory bulb
over 40 million in olfactory epithelium
10,000x more sensitive than taste receptor cells
olfactory bulb
located within the limbic system of the brain
scents stimulate memories and emotions
receives and interprets information from the olfactory receptors
ansomia
condition - no sense of smell
phantosmia
olfactory hallucinations
may be a symptom of Alzheimer's Disease, Huntington's Disease, or Parkinson's Disease
tongue
covered with tiny raised areas called papillae
some papillae create friction between this and food
papillae house the taste buds
taste buds
found in papillae, roof of mouth, lining of cheeks
over 10,000 in the mouth
opening in the ________ is the taste pore
taste cells
c. 50 per taste bud (gustatory receptors)
cilia from gustatory receptor cells reach to the outside via the taste pore
when the cilia are stimulated, they send information to the brain via the cranial nerves
the brain interprets the sensation of taste
each is capable of identifying all 5 taste sensations (sweet, salty, bitter, sour, umami) but each one prefers a specific taste
meissner's corpuscle
located in the upper region of the dermis
detects light touch, motion
pacinian corpuscle
egg-shaped structure also found in the abdomen (pancreas) and joints
contains a free nerve ending that detects deep pressure
thermoreceptors
detect temperature such as hot and cold
nociceptors
located throughout the body
detect pain as well as temperature, pressure, and the stretching of tissue
detect two types of pain: somatic (skin and deep tissue) and visceral (internal organs)