BIOL 4380 Lecture Notes - Lecture 10: Olfactory Bulb, Olfactory Tubercle, Olfactory Tract
13 May 2018
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May 3d
• Final focuses on the material covered after the first midterm. Final will be exactly the same
format as the midterm, 20-30% of short asers, epet a figure fro the tetook that ou’re
gonna have to fill in the blanks.
• We’re goig to oer chapter 15 (part 1 and 3 + 27). So the final will focus on chapters 9-11-13
and 14. If you study them well, you will do pretty well. Put 10% of your effort on midterm 1
aterial…
• We’re goig to e disussig the olfator sste.
• Chapter 15th 3 parts: chemosensory triad: olfactory (sense of smell), vomeronasal (closely
related, about processing pheromones which lead sexual behavioural), gustatory, 3 closely
related systems.
• Odorants: volatile airborne chemicals, the olfactory system gauges the identity, concentration
and quality of these chemicals. What would we mean by the quality of an odorant: The same
exact odorant, can smell one way to us at a certain concentration and completely differently at
a different concentration. These are important in all animals.
• Organization of the human olfactory system: nasal cavity through which we inhale air and the
airore odorats, the loatio iside the asal ait that’s ritial for olfator sesig is
called olfactory epithelium.
• The bone that separates the olfactory epithelium from the olfactory bulb, is called the cribriform
plate which is perforated by very fine channels that allow the axons of the neurons to innervate
the olfactory bulb.
• Olfactory receptor neurons are surrounded by epithelial cells. The axons of these ORNs,
innervate the olfactory bulb. The airborne odorants are contacting these ORNs.
• Olfactory receptors, innervate the bulb and all of the axonal tracts cumulatively are referred to
as olfactory or cranial facial nerve I. olfactory bulb produces olfactory tract, which takes signals
into the CNS. the olfactory tract from the bulb, innervates a whole bund of structures. The main
one is called the pyriform cortex. Other structures: the olfactory tubercle, amygdala and
entorhinal cortex (only know the first 3).
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Final focuses on the material covered after the first midterm. So the final will focus on chapters 9-11-13 and 14. If you study them well, you will do pretty well. What would we mean by the quality of an odorant: the same exact odorant, can smell one way to us at a certain concentration and completely differently at a different concentration. The axons of these orns, innervate the olfactory bulb. The main one is called the pyriform cortex. Other structures: the olfactory tubercle, amygdala and entorhinal cortex (only know the first 3). The forebrain structures, further innervated the cerebrum and several structures in it, mainly the orbitofrontal cortex, thalamus, hypothalamus and hippocampal formation. The connectivity between these structures is very complex with lots of feedback mechanisms, and it is very poorly understood. The olfactory system through these structure will eventually control the motor (movement toward or away), visceral (salivation, production of other stuff!) and emotional reactions.
