Lecture 12 Notes F09

Lecture 12 Notes F09 - PSYCH 301 LECTURE 12 Olfaction and...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
PSYCH 301 LECTURE 12 Olfaction and Gustation I. Chemical Senses:  These sensory systems are the least well understood,  but also the most ancient in an evolutionary sense, and extremely important in  most mammals, including man.   A. Olfaction and gustation are derived from primitive chemical senses  and are very closely related:  smell is the detection of chemicals in air (including  the air from the mouth), while taste is the detection of chemicals in drink and  foods.   B. Even simple single celled creatures have  chemoreceptors  which  allow them to forage for chemicals.   They move their flagella to orient their  movement towards concentrations of nutritional requirements (e.g. glucose) and  away from noxious chemicals.   Receptors embedded in the membrane of the  creature bind chemicals on the outside and create signals on the inside. C. More   complex   multicellular   creatures,   such   as   the   worm   C.  Elegans , forage in a more complex manner.  The entire genome of  C. Elegans  was recently sequenced and it was found to have nearly a thousand genes  encoding different chemoreceptors. II. Olfaction :  Smell A. The anatomy of olfaction. 1. The   olfactory epithelium   contains bipolar receptors cells  which respond to odors.  The cilia of these neurons project into the mucous layer  of the nasal passages.  These neurons project through the cribiform plate into the  olfactory bulb, and neurogenesis occurs throughout life. 2.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

Lecture 12 Notes F09 - PSYCH 301 LECTURE 12 Olfaction and...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online