reflexes, nervous system ppt
DESCRIPTION
reflexes powerpoint, reflexes slideshowTRANSCRIPT
For more slides click here
DOWNLOAD THIS SLIDE
ELAINE N. MARIEB
EIGHTH EDITION
7
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
PowerPoint® Lecture Slide Presentation by Jerry L. Cook, Sam Houston University
ESSENTIALSOF HUMANANATOMY
& PHYSIOLOGY
The Nervous System
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Functional Classification of Neurons Sensory (afferent) neurons
Carry impulses from the sensory receptors Cutaneous sense organs
Motor (efferent) neurons
Carry impulses from the central nervous system
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Functional Classification of Neurons Interneurons (association neurons)
Found in neural pathways in the central nervous system
Connect sensory and motor neurons
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Neuron Classification
Figure 7.6
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
The Reflex Arc Reflex – rapid, predictable, and involuntary
responses to stimuli
Reflex arc – direct route from a sensory neuron, to an interneuron, to an effector
Figure 7.11a
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Simple Reflex Arc
Figure 7.11b–c
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Types of Reflexes and Regulation Autonomic reflexes
Smooth muscle regulation
Heart and blood pressure regulation
Regulation of glands
Digestive system regulation
Somatic reflexes
Activation of skeletal muscles
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Autonomic Reflexes Abdominal Reflex
Stimulus: light stroking of the abdomen
Response: Contraction of the abdominal muscles that pull navel towards stimulus
Spinal Segment: T7 - T12
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Somatic Reflexes Biceps Reflex
Stimulus: tap to tendon of biceps brachii muscle
Response: Flexion at elbow
Spinal Segment: C5, C6
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Somatic Reflexes Triceps Reflex
Stimulus: Tap to tendon of triceps brachii muscle
Response: Extension at elbow
Spinal Segment: C6, C7
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Somatic Reflexes Patellar Reflex
Stimulus: tap to patellar tendon
Response: extension at knee
Spinal Segment: L2-L4
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Somatic Reflexes Ankle-jerk Reflex
Stimulus: Tap to calcaneal tendon
Response: extension (plantar flexion) at ankle
Spinal Segment: S1-S2