Faizan Kalwar. Basal cells – replace receptor neurons (a feature unique to the olfactory neurons) Sustenacular cells – scattered throughout epithelium,

Slides:



Advertisements
Similar presentations
NERVE IMPULSE TRANSMISSION
Advertisements

Olfaction Notes Maddie Cline, Kelly Piper, Meg Mori, Emma Ivanauskas.
Physiology Behrouz Mahmoudi Olfactory System 1.
Receptors & Signaling. Assumed Knowledge Structure of membrane proteins Ion concentrations across membranes Second messengers in signal transduction Regulation.
Exit BASIM ZWAIN LECTURE NOTES BASIM ZWAIN LECTURE NOTES Home Chemical Senses:Gustation Background Mechanism by which we can detect chemicals in both the.
The Sense of Smell Gonçalo Martins.
The Chemical Senses. Chemoreceptors  Chemically sensitive cells located throughout the body to monitor: Irritating chemicals on skin or in mucus Ingested.
Physiology of Smell. Physiology of Smell Structure of the olfactory system.
Sensation of Smell Professor A.M.A Abdel Gader
Special senses. Vision Hearing Smell Taste Smell Anatomy –Olfactory mucus: in the roof of nasal cavity near the septum –Contain olfactory receptors.
Sense of Smell.
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Chemical Senses  Chemical senses – gustation (taste) and olfaction (smell) 
Olfactory The sense of smell Olfactory Bulbs The olfactory bulbs relay sensory signals to the olfactory tract. small axons from the olfactory epithelium.
صدق الله العظيم الاسراء اية 58. By Dr. Abdel Aziz M. Hussein Lecturer of Physiology Member of American Society of Physiology.
 Olfact = To smell  Olfaction detects chemicals in solution which is detected in the Olfactory Epithelium which is a yellow-tinged patch located in.
Awake Brain Surgery:
Figure 11.3 Neuroglia. © 2014 Pearson Education, Inc. Capillary Neuron
Inhibitory and Excitatory Signals
Neural communication How do neurons send messages to each other?
Channel-linked Receptors aka: ligand-gated channels a receptor type seen in synaptic transmission rapid response (ms) limited response –depolarization.
Neurons & Neuroanatomy What are the characteristics of neurons important for Cognitive Neuroscience? What is the brain structure important for CogNeuro?
1 Session 5 The Neuron II: Synaptic Transmission PS111: Brain & Behaviour Module 1: Psychobiology.
The Nervous System: Sensory Systems
1 Sense of Smell. Smell (=Olfaction) 2 Normal individual can discriminate more than odors, but not highly developed in human as in some animals.
*besides vision! Sensory “connections” Olfaction Taste Hearing Touch.
Why do we have a sense of taste? protection palatable or poisonous? pleasure taste and olfaction = flavour communication olfaction important, taste less.
B. Signal Transduction Pathway (cell signaling)
Taste and Smell Dr Taha Sadig Ahmed. Taste, gustatory perception, or gustation [1] is the sensory impression of food or other substances on the tongue.
Olfactory, Gustatory Objectives: For each sense identify… specialized organs, anatomy receptor structure and specializations receptor signal transduction.
Aim: To understand how the olfactory transduction system is organized Are there several receptor protein “species” each of which detect a class of odorant.
II Sensory Chemoreceptors: A diverse and evolutionarily ancient class of receptors.
Chapter 17: The Special Senses
Copyright © 2010 Pearson Education, Inc. Chemical Senses Chemoreceptors for chemicals in aqueous solution.
SENSORY RECEPTION © 2012 Pearson Education, Inc..
Cylic GMP, NO, and Sensory Reception Lecture 28BSCI 420/421Nov cGMP & Vision 2. NO & cGMP 3. Olfaction.
Anatomy and Physiology I Electrical Signals in Neurons Action Potentials The Synapse Instructor: Mary Holman.
Copyright © 2007 Wolters Kluwer Health | Lippincott Williams & Wilkins Neuroscience: Exploring the Brain, 3e Chapter 8: The Chemical Senses.
Special Senses 12.1 Olfaction.
Nucleus Dendrites Collect electrical signals Cell body Integrates incoming signals and generates outgoing signal to axon Axon Passes electrical signals.
Structure & Function
This is what would happen under the myelin sheath. At the end of the myelin sheath, the membrane potential would still be above.
Chemical Senses. CHEMICAL SENSES  The gustation (taste) and olfaction (smell) and both dependent on chemoreceptors that detects specific chemicals (dissolve.
Neuron Function The Membrane Potential – Resting potential Excess negative charge inside the neuron Created and maintained by Na-K ion pump Copyright ©
Afferent Nerves Efferent Nerves cell body: cell body: central part of cell; contains the nucleus axon: axon: long slender extension from cell body; used.
Sense of Smell Dr.Mohammed Sharique Ahmed Quadri Assistant Professor Physiology Al Maarefa College 1.
Chemical Senses Chemical senses – gustation (taste) and olfaction (smell) Their chemoreceptors respond to chemicals in aqueous solution Taste – to substances.
Special Senses.
NERVE CELLS by Grace Minter.
Sense of Smell The organ of smell is the olfactory epithelium
Chapter 17: The Special Senses
Figure 4. Two Intracellular Signaling Cascades Implicated in Chemosensory Transduction(A) Diagram of cyclic nucleotide signaling in the transduction compartment.
NOTES - UNIT 5 part 2: Action Potential: Conducting an Impulse
Nerve Impulse Conduction
Nerve Impulses.
Domina Petric, MD Olfaction.
Chemoreceptors Taste Smell 20-Nov-18 Taste & Smell.
Olfactory pathway Domina Petric, MD.
Capillary Neuron Astrocyte
The Sense of Smell.
Agenda 5/2 Nervous System Quick Recap Mock Exam Score ‘meetings’
بسم الله الرحمن الرحيم Sense of Smell.
Lipid Soluble Hormone.
Cilia in the CNS: The Quiet Organelle Claims Center Stage
Neuron to Neuron Impulse Movement
Volume 15, Issue 5, Pages R154-R158 (March 2005)
Chemical senses – gustation (taste) and olfaction (smell)
Vision Hearing Smell Taste
Action Potential.
Transmission & Impulses Across a Synapse
Review Quiz Please open this review in a slide show mode. Answer a question first, then go to the next slide for the correct answer.
Presentation transcript:

Faizan Kalwar

Basal cells – replace receptor neurons (a feature unique to the olfactory neurons) Sustenacular cells – scattered throughout epithelium, secretory granules empty contents on mucosal surface Receptor neurons

- Humans have ~40 million - Bipolar neurons - Dendrites extend into mucosal surface -Cilia on surface of dendritic knobs -Receptors on cilia make contact with odorants -One receptor for each neuron - Axons lead into glomerus

-Odor molecule binds to receptor protein on surface of cilia -Receptor conformation changes  activates G-protein (G olf ) -Adenylate cyclase activation produces cAMP -cAMP opens ion channels  Na + and Ca 2+ enter - Depolarization occurs at dendritic region which leads to generation of an action potential

-Activation of multiple receptors allows molecules that have never been encountered to be characterized -ORNs are sensitive to a subset of odorants which makeup its tuning curve - Some ORNs are very selective while others are much broader -Different thresholds exist for a given odorant between neurons with the same receptor - Adaptations occur

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.