Anatomy & Physiology I The Senses Seminar 8. Unit 8 – Senses Overview Classification of Sense...
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Transcript of Anatomy & Physiology I The Senses Seminar 8. Unit 8 – Senses Overview Classification of Sense...
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Anatomy & Physiology IAnatomy & Physiology I
The SensesSeminar 8
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Unit 8 – Senses Overview
Classification of Sense Organs General
Free Nerve Endings Encapsulated Nerve Endings
Special Eye Ear Taste Receptors Smell Receptors
Structures of Each
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Classification of the Sense OrgansClassification of the Sense Organs
• General sense organs Often exist as individual cells or receptor units Widely distributed throughout the body
• Special sense organs Large and complex organs Localized grouping of specialized receptors
• Classified by presence or absence of covering capsule Encapsulated Unencapsulated (“free” or “naked”)
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• Classification made by type of stimuli required to activate receptors Photoreceptors (light) Chemoreceptors (chemicals) Pain receptors (injury) Thermoreceptors (temperature changes) Mechanoreceptors (movement or deforming
of capsule) Proprioceptors (position of body parts or changes in
muscle length or tension)
Classification of the Sense Organs (cont’d.)Classification of the Sense Organs (cont’d.)
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Converting a Stimulus into a SensationConverting a Stimulus into a Sensation
• All sense organs have common functional characteristics
All are able to detect a particular stimulus
A stimulus is converted into a nerve impulse
A nerve is perceived as a sensation in the CNS
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General Sense OrgansGeneral Sense Organs
• Distribution is widespread; single-cell receptors are common
• Examples Free nerve endings: Sensitive to pain and crude touch Meissner corpuscles: Responsive to fine touch and
vibration Ruffini corpuscles: Sensitive to touch and pressure Krause’s end-bulbs: Touch or cold Golgi tendon receptors: Proprioception Muscle spindles: Proprioception
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General Sense Receptors
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Special Sense Organs
Four types Eyes Ears Nose Taste Buds
Let’s take a look at each one….
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Special Sense OrgansSpecial Sense Organs
• The Eye• Function• Structure
• Three layers of the eyeball• Sclera• Choroid• Retina
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Special Sense Organs (cont’d.)Special Sense Organs (cont’d.)
Conjunctiva: Mucous membrane covering the front surface of the
sclera and lining the eyelid Lens:
Transparent body behind the pupil; focuses light rays on the retina
Eye fluids Aqueous humor
Watery fluid in the anterior chamber in front of the lens
Vitreous humor Jellylike fluid in the posterior chamber behind the lens
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FYI on the Iris
As the fibers of the iris contract, the pupils dilate, letting in more light.
Other fibers are circular. When they contract, the pupils constrict, letting in fewer light rays.
Normally the pupils constrict in bright light and dilate in dim light.
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The Eye - Structure
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Special Sense Organs (cont’d)
Visual Pathway Innermost layer of retina contains rods and
cones Impulse travels from the rods and cones through
the bipolar and ganglionic layers of the retina Nerve impulse leaves the eye through the optic
nerve; the point of exit is free of receptors and is therefore called a blind spot.
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Cells of the Retina
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Conditions & Surgery for the Eye
Conditions Presbyopia Cataracts Blind Spot Glaucoma
Take a look at these surgical procedures on your own…. Radial keratotomy (RK) Astigmatic Keratotomy (AK) Astigmatic Keratotomy (AK) Automated Lamellar Keratoplasty (ALK) Laser Assisted in situ Keratomileusis (LASIK) Conductive Keratoplasty (CK)
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Corneal Transplant
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Special Sense Organs (cont’d)
• The Ear• Function
The ear functions in hearing, equilibrium, and balance. Receptors for hearing and equilibrium are
mechanoreceptors.
Structure External Ear Middle Ear Inner Ear
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The Ear
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Special Sense Organs (cont’d)
Structure – Divisions of the EarExternal ear
o Auricle (pinna)o External auditory canal
•Curving canal or tube 2.5 cm (1 inch) in length•Contains ceruminous glands producing ear wax•Ends at the tympanic membrane or eardrum
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Special Sense Organs (cont’d)
Middle earo Houses ear bones or ossicles
o malleus, incus, and stapeso Ends in the oval windowo The auditory (eustachian) tube connects
the middle ear to the throato Inflammation called “otitis media”
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Special Sense Organs (cont’d)
Inner earo The bony labyrinth is filled with fluid called
perilympho The labyrinth is divided into the vestibule,
semicircular canals, and cochleao Membranous labyrinth is filled with endolympho Receptors for balance in the semicircular canals
are called cristae ampullariso Specialized hair cells on the organ of Corti
respond when bent by the movement of surrounding endolymph set in motion by sound waves
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Inner Ear
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Sound Waves
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Special Sense Organs (cont’d.)Special Sense Organs (cont’d.)
• The Taste Receptors
Receptors are Chemoreceptors called taste buds
Cranial nerves VII and IX carry gustatory impulses
Six kinds of “primary” taste sensations—sweet, sour, bitter, salty, metallic, and umami (meaty)
Gustatory and olfactory senses work together
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The Tongue
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Special Sense Organs (cont’d.)Special Sense Organs (cont’d.)
• The Olfactory (smell) Receptors
Receptors for fibers of olfactory or cranial nerve lie in olfactory mucosa of nasal cavity
Olfactory receptors are extremely sensitive but easily fatigued
Odor-causing chemicals initiate a nervous signal that is interpreted as a specific odor by the brain
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Olfactory Structures
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Let’s Review!
Unit 8Chapter 9
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Which of these is a special sense?
A. Pressure
B. Stretch
C. Vision
D. Temperature
E. Pain
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A mechanoreceptor may detect changes in__________?
A. Temperature
B. Light intensity
C. pH
D. Pressure
E. Presence of sugars
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Muscle spindles are involved in the sense of _______________?
A. Proprioception
B. Pain
C. Smell
D. Movement
E. Gravity
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Most of the functional part of the ear lies deep within the:
A. Parietal bone
B. Frontal bone
C. Occipital bone
D. Temporal bone
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What are the names of the three ossicles that allow sound to be transmitted through the middle ear?
:
1. Malleus, Incus, Stapes
2. Cochlear nerve, Auditory tube, Oval window
3. Ampulla, Vestibule, Semicircular Canals
4. Endolymph, Perilymph, Acoustic nerve
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The layers of the eyeball are all except?
A. Sclera
B. Choroid
C. Retina
D. Cochlea
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Which Division of the Ear is being described below?
The semicircular canals are filled with endolymph and are the primary organs in maintaining balance and equilibrium.
Damage or disease to this part of the ear not only affects balance but also may result in permanent hearing loss.
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The transparent window of the eye is?
1. Retina
2. Iris
3. Cornea
4. Choroid
5. None of the above
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The colored muscular part of the eye?
A. Iris
B. Retina
C. Sclera
D. pupil
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The gland that produces tears is?
A. Endocrine
B. Lacrimal
C. Pituitary
D. Salivary
E. None of the above
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What is being described below?
Sense Sweet, Sour, Salty, Bitter tastes The medical term for taste buds Papillae Part of the tongue
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Nearsightedness is:
A. Myopia
B. Astigmatism
C. Presbyopia
D. Glaucoma
E. hyperopia
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Which photoreceptor is responsible for Color vision?
A. Rods
B. Cones
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The organ of Corti is involved in the sense of____?
A. Vision
B. Pain
C. Hearing
D. Equilibrium
E. Motion
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Sensory perception occurs in the_____?
A. Receptor
B. Organ surrounding the receptor
C. Afferent neuron
D. Brain
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When a person ages, the lenses of the eye lose some of their elasticity and can no longer bring near objects into focus. This is called:
A. Hyperopia
B. Myopia
C. Astigmatism
D. presbyopia
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Visual interpretation occurs in:
A. The cerebellum
B. The pons
C. The medulla oblongata
D. The cerebrum
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When the lens becomes hard, loses its transparency and becomes cloudy:
A. Glaucoma
B. Myopia
C. Retinopathy
D. Cataracts
E. astigmatism
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Inflammation of the middle ear:
A. Otitis externa
B. Otitis interna
C. Otitis media
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Question to ponder….
We have discussed the importance of maintaining homeostasis in our bodies. We have seen how the integumentary
system and muscular system contribute to homeostasis. How would you suggest
that the general and special senses contribute to homeostasis?
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Answer
The general and special senses help maintain homeostasis in the body by monitoring the conditions in our environment.
For instance, heat and cold receptors help us to avoid conditions that will adversely affect temperature regulation in our body. Pain receptors tell us to avoid touching certain things.
Because of special senses such as sight and hearing, we are able to avoid many dangerous situations, which helps maintain conditions within a normal range in the body.
Our general and special senses are constantly accumulating data that are integrated with memory and reflexes to produce homeostatic responses
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Review of Final Project
You are tasked with creating a PowerPoint presentation that will be used to educate a patient on a recently diagnosed condition.
Create an educational and informative piece that can be understood by the average citizen.
Details:1. Select a disease or condition that has been covered in one of the
systems discussed in this course (Chapters 1-10).
2. Describe the anatomy of the organs, physiology, pathology, and biochemistry involved in the diagnosis.
3. Include information about how other organ systems are impacted by the condition.
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What you are required to include….• Be sure that you have addressed the following objectives in
your work: Identify the major anatomical regions, landmarks, directions and
cavities of the organs affected by the diagnosis. Identify the organs involved in the diagnosis. Explain the normal
functioning of the organs. Analyze the chemical basis of physiologic processes involved in
the disease. Explain how the disease or condition affects the integration of the
body systems in maintaining homeostasis. Describe the functional relationships between the body systems
and the disease process.
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An APA PowerPoint
Title slide - Includes the same information as an APA paper. Introduction slide– a bulleted slide that covers the major points you will
be covering in the PPT Slides
Titles for each slide No more than 5 – 7 words for each bulleted item If you include pictures on the slide, you have to place a caption under the picture that
includes the citation in order to avoid copyright issues. 12 – 15 Slides (not including your title or reference slide)
Speaker notes This is where you will explain the bulleted items on your slide. Cite your references in proper APA format – No URLs
Conclusion slide– sum up your work Reference slide (see next slide)
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References
Do not use a website address as the reference
Use a hanging indent Use proper APA reference format for each
type of material you use. Journal article Website Textbook Other….
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Proper Reference for our Textbook References
Textbook Reference
Thibodeau, G., Patton, K. (2008). Structure and Function of the Body 9
(13th ed). St. Louis, MO: Mosby Elsevier Publishing
Notice the second line is indented 0.5” This is called a hanging indent
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Website Examples for Citations and the corresponding References
In-text Citation example (speaker notes):
The National Osteoporosis Foundation (2004) stated, “Eighty persons of those affected by osteoporosis are women” (¶ 1).
Multiple Sclerosis affects more women than men (Copeland, 2003).
References (this is what your reference page would look like)
National Osteoporosis Foundation. (2004). Fast facts. Retrieved from
http://www.nof.org
Copeland, L. (2003). Managing Multiple Sclerosis. Journal of Neurological
Disorders, 25, 69 – 72. Retrieved from http://www.jobjournal.com
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Reminder of My favorite quote…..
Don’t wait until the final day to ask for help. Favorite saying….
Lack of planning on your part, does not constitute an emergency on my part.
Yes, you can borrow this for your older children, coworkers and anyone else who meets the criteria!
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Reminders & Questions
Surveys Important to new students learning Quality Improvement
Week 9 is our last Seminar No seminar in Week 10 Final Exam in Week 10 and reflective discussion
Final Project is Due at the end of Unit 9 Don’t wait until the last minute Please review for any last minute questions this weekend Send email with questions
QUESTIONS?