The Skin Example Skin Receptors: Free nerve ending; Pacinian corpuscles; Ruffini endings; Hair follicle ending; Meissner corpuscle; Merkel’s disk Light.

Slides:



Advertisements
Similar presentations
Chapter 13: Touch Touch: The skin-based receptor system. The entire surface of the body on which there is living tissue (skin) is a potential receptive.
Advertisements

Senses Aristotle: classical “five senses”: Sight Hearing Taste Smell Touch This is not all: what did Aristotle leave out? There are other somatosensory.
How and why do organisms respond to changes in their environment? Can you list what is required for a coordinated response? What makes up the CNS? Can.
Chapter 12 Nervous System III - Senses
Sensory and Motor Pathways
General Sensory Reception. The Sensory System What are the senses ? How sensory systems work Body sensors and homeostatic maintenance Sensing the external.
Human Biology Sylvia S. Mader Michael Windelspecht
1 Sensory Pathways DR. ZAHOOR ALI SHAIKH. Before we talk about sensory pathways we will trace the course of sensory impulse from receptors to the spinal.
The Somatic Sensory System Chapter 12 Friday, November 7, 2003.
1 Somatic Sensation ( MCB160 Lecture by Mu-ming Poo, Friday March 9, 2007) Introduction –Adrian’s work on sensory coding –Spinal cord and dorsal root ganglia.
Principles of Human Anatomy and Physiology, 11e1 Chapter 16 Sensory, Motor & Integrative Systems.
The Peripheral Nervous System
Sensory, Motor, & Integrative System
CUTANEOUS SENSES Overview of Cutaneous Senses Receptors and Fibers Pathways Gate Control Theory Phantom Limbs.
Somatic Sensory Pathways
Chapter 10a Sensory Physiology.
The Human Nervous System. It includes Central Nervous System and the Peripheral Nervous System. It acts as a highway for information to travel. It controls.
how the brain receives and interprets information from the environment
Somatosensory System. The Integument (aka “Skin”) Giant, washable, stretchable, water-proof sensory organ…The boundary between you and not-you 6-10 pounds.
Nervous System Exercises 22 and 23. Reflexes Reflexes are fast, predictable, automatic, subconscious responses to changes inside or outside the body.
Sense of Touch. Touch and Pressure Often called cutaneous sensations because most of their receptors are in the skin Governed by mechanoreceptors of different.
Somatic and Special Senses
Touch.
Topic 13 The Somatic Sensory System Lange Biology Neurobiology.
Sensation: The conscious or subconscious awareness of external or internal stimuli. Perception: The conscious awareness and the interpretation of meaning.
SPECIAL SENSES- TOUCH (SOMATIC) Nicholas Brazones, Stephanie Hutchinson, Khaled Nada, Wynne Kirchner.
Chapter 31 Nervous System.
Physiology of big hemispheres. FUNCTIONS OF THE BASAL GANGLIA These ganglia perform essentially all the motor functions, even controlling the voluntary.
LAB EXERCISE 18 GENERAL SENSES
Somatic Sensory System Sensation arising from skin muscle joints Allow you to survive in your environment and make appropriate motor responses.
Somatic Senses General Sensory System. Sensation Define Stimulus Type Sensory Organ Sensory Receptors Exteroceptors Interoceptors Proprioceptors Receptor.
Part 2: Dr. Steve I. Perlmutter Touch Temperature & Pain Proprioception Sensorimotor Neurophysiology of Active Sensing Somatosensory System Receptor Function.
The Nervous System.  The function of the nervous system is to allow the animal to quickly detect, communicate and co- ordinate information about its.
Chapter 12  Touch  Taste  Vision  Hearing  Smell.
SOMATIC SENSORY SYSTEM D. C. MIKULECKY PROFESSOR OF PHYSIOLOGY AND FACULTY MENTORING PROGRAM.
Somatosensation Lesson 17. Somatosensation n Sensory info from body n Cutaneous senses l exteroceptors l touch / pain n Kinesthesia l interoceptors l.
Chapter 10, part A Sensory Physiology.
SENSORY SYSTEM LECTURE 1 RECEPTORS DR. ZAHOOR ALI SHAIKH.
Sensation- conscious (perception) or subconscious awareness of changes in environment.
Central Nervous System Introduction The Sensory System.
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings Human Anatomy & Physiology, Sixth Edition Elaine N. Marieb PowerPoint ® Lecture.
By: Natasha Zelenka, Lexio Scott, Aneidi Andrew, and Michael Anderson.
What you will learn today . . .
Physiology of large hemispheres of the brain and cerebellum Author ass.prof. N.M. Volkova.
Touch, Vision, Smell, Balance, Hearing
Psychology 304: Brain and Behaviour Lecture 27
Functional Organization of Nervous Tissue Chapter 11
PowerPoint ® Lecture Slides prepared by Leslie Hendon, University of Alabama, Birmingham HUMAN ANATOMY fifth edition MARIEB | MALLATT | WILHELM 14 Copyright.
Senses in the Skin.
Somatic senses The somatic senses are the nervous mechanisms that collect sensory information from all over the body. These senses are in contradistinction.
THE NERVOUS SYSTEM CENTRAL NERVOUS SYSTEM PERIPHERAL NERVOUS SYSTEM PERIPHERAL NERVOUS SYSTEM.
CHAPTER 21 THE NERVOUS SYSTEM and SENSES Homeostasis-maintaining a constant internal balance; responding to stimuli Stimuli- an external or internal.
General Sensory Reception
© 2013 Pearson Education, Inc. Peripheral Nervous System (PNS) Provides links from and to world outside body All neural structures outside brain –Sensory.
Somatosensory Tracts and Maps NBIO 401 – Wednesday October 2, 2013.
The Senses Classification of Sense Organs
Nervous System. Meet Your Nervous System You have about 150 billion brain cells Your brain is about 2% of your body’s weight, but it uses about 20% of.
Sensory Function of the Nervous System
Somatic & Special Senses Part 1.
Nerves Neurones T R E C E L P E E L T O E R S L S P C R I E N D M E I A M N U G P U L M P I S E A S H S T S A N E D L L S T O A N G N N R E A E U R S O.
Touch EL: Be able to describe how our skin allows us to feel things and create the sense of touch.
Chapter 14 Erica Ocker.
Somatosensation Mechanoreceptors that respond to touch/pressure on the surface of the body. Sensory nerve responds propotional to pressure 4 types of mechanoreceptors:
THE SENSE You may think that you hear sounds with your ear, smell with your nose, or taste with your tongue, but that is not true. Your sensory organs.
Nervous System.
Fig. 9.2 Hair Free nerve endings (respond to painful
Nervous System III Anatomy and Physiology
What is the last dream you remember that is school appropriate?
Sensory Pathways and the Somatic Nervous System
Bell Work How does Gestalt psychology apply to vision?
Presentation transcript:

The Skin Example Skin Receptors: Free nerve ending; Pacinian corpuscles; Ruffini endings; Hair follicle ending; Meissner corpuscle; Merkel’s disk Light touch Pressure Vibration Temperature Pain Hair movement

The Skin Example Skin Receptors: Free nerve ending; Pacinian corpuscles; Ruffini endings; Hair follicle ending; Meissner corpuscle; Merkel’s disk

Different types of skin receptors

Spinal Cord

Monosynaptic Reflex Disynaptic Reflex 1. Sensory neurons 2. Neurons in the spinal cord 3. Motor neurons which control muscle contraction

Why does the reflex occur before perception takes place? Answer: The sensation of heat reaches our perception only after the reflexive withdrawal took place, because the somatosensory information can travel very quickly to the spinal cord and then back down to the motor neurons, whereas it takes a longer time for this information to reach the higher areas of the brain, where it yields to perception.

SKIN Spinal Cord  Brain BRAIN

Somatosensory pathway

Spinal Cord  Brain Cerebral Cortex Thalamus Medulla Note crossing! Spinal Cord

The Thalamus: Anatomy

The thalamus: Functions The major role of thalamus is to gate and otherwise modulate the flow of sensory information to cortex.

The Thalamus: Functions The thalamus also play an important role in regulating states of sleep and wakefulness.

Sensory processing hierarchy ThalamusCortexSensor

Sensory processing is different areas of the brain

The full somatosensory pathway Touch on left finger Heat on right finger

The “Homunculus” The cortical representation of sensory information is not uniform, but emphasizes certain sensory parts of the body, such as the lips and fingers.

Somatosensory - Brain CNS preserves the peripheral body map. Amount of CNS tissue is proportional to the distribution of peripheral receptors.

Homunculus: Other Animals

Brain Mapping Finding out what each part of the brain does

Brain Areas are Specialized for Different Functions

Demo: how many picks? Use a fork for the following experiment. Gently pressure your neighbor’s fingertip with 1, 2, or 3 of the fork’s picks. Can he tell (without looking) how many picks are touching his fingertip? Now do the same on other body area, such as inside the arm, on the legs, on the lips, or on the back of the body. Can you still tell how many picks? Where?

Somatosensory discrimination varies throughout the body surface

Somatosensory - Brain | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ?

Somatosensory - Brain | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | SiteThreshold Distance Fingers2-3 mm Upper Lip5 mm Cheek6 mm Nose7 mm Palm10 mm Forehead15 mm Foot20 mm Belly30 mm Forearm35 mm Upper arm39 mm Back39 mm Shoulder41 mm Thigh42 mm Calf45 mm Influence of: Ice Distraction Sound

Pain! Gate Control Theory

Proprioception ?

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

© 2024 SlidePlayer.com. Inc. All rights reserved.