Download MBBS Olfactory Nerve Lecture PPT

Download MBBS (Bachelor of Medicine and Bachelor of Surgery) Latest Olfactory Nerve Lecture PPT


Introduction

? Almost all environmental chemicals necessary for life enter the body by nose and

mouth.

? The senses of smell (olfaction) and taste (gustation) monitor such chemicals
determine the flavor and palatability of foods and beverages and
warn of dangerous environmental conditions, including fire, air pollution,
leaking natural gas and bacteria-Iaden foodstuffs.

? These senses contribute significantly to quality of life and when dysfunctional can

have untoward physical and psychological consequences.

? A basic understanding of these senses in health and disease is critical for the

physician because thousands of patients present to doctors' offices each year

with complaints of chemosensory dysfunction.

? Among the more important recent developments in neurology is the discovery that

decreased smell function is among the first signs if not the first sign of such

neurodegenerative diseases as Parkinson's disease (PD) and Alzheimer's disease

(AD) signifying their "presymptomatic" phase
Olfactory nerve

? C N I

? Components - sensory ( SVA )

? Function - olfaction ( smell )

? Opening in skull through which it passes - cribriform plate of ethmoid

bone




The basic pathways for processing olfactory information.
Anatomy of the olfactory neural pathways showing the distribution of olfactory

receptors in the roof of the nasal cavity (Copyright Oavid Klemm, Faculty and

Curriculum Support [FACS] Georgetown University Medical Center )


Structure of olfactory epithelium

(ORNs ? olfactory receptor neurons )


Peripheral and central components of the primary olfactory pathway


Schematic representation

of olfactory bulb .

Each receptor type (red

green,blue) projects to a

common glomerulus.

The neural activity within

each glomerulus is modul-

ated by peri glomerular

cells.

The activity of the primary

projection cells,the mitral

and tufted cells, is

modulated by granule cells

,periglomerular ceIls, and

secondary dendrites from

adjacent mitral and

tufted cells



Central components and basic connections of the olfactory system.


The basic pathways for processing olfactory information.

This post was last modified on 30 November 2021