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NS - Olfactory
Test 3
11
Anatomy
Graduate
07/27/2009

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Cards

Term
What is the "nose brain"
Definition

it is also called the rhinencephalon which is a complex system of neural circuits that form the sense of smell

composed of three subdivisions

  1. archicortex: hippocampus
  2. paleocortex: olfactory response
  3. neocortex: new cortex
Term

Explain the stimulus that causes

are sense or detection of a smell

Definition
receptors are stimulated by chemicals that generate odor
Term
Receptors are located where?
Definition

In the olfactory membrane

located in the mucosa of the nostrils

they have a lifespan of 50 days

Term
The olfactory system or tract divides into two areas what are they
Definition
  1. medial olfactory striae - a crossed pathway that uses the ant commissure
  2. lateral olfactory striae - UNcrossed pathway
Term

There are 5 Key Areas of Synapse

name them

Definition
  1. olfactory tubercle
  2. piriform cortex
  3. anterior olfactory nucleus
  4. amygdala
  5. entrorhinal cortex
Term
Anosmia
Definition
complete loss of smell - usually the result of a head injury that was caused a shearing force
Term
Hyposmia
Definition

reduction or partial loss of sense of smell (can happen as we age)

commonly seen in Parkinson's and Alzheimer's

Term
Cacosmia & Uncinate Fit
Definition

seizure from temporal lobe by tumor causes hallucinations and smells

- uncus and amygdala

Term
Rhinorrhea
Definition

a watery dicharge from the nose

can be caused by trauma to the cribiform plate and leads to CSF leaking from the nose

Term
The olfactory system has a central pathway describe its steps
Definition
  1. odor stimulates hair receptors & action potential is generated
  2. information is sent down CN I
  3. olfactory nerve travels through cribiform plate & enters olfactory bulb
  4. olfactory bulb lies on ventrorostral aspect of ipsilateral forebrain
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