Download presentation
Presentation is loading. Please wait.
1
The basic reflex arc and spinal cord circuitry
2
Basic Spinal Anatomy Transversal cut of the spinal cord
3
Basic Spinal Anatomy Muscle spindles Motoneurons targetting muscles
Golgi tendon organs Soma of the motoneurons Sensory information Tactile, pain, thermic receptors on the skin
4
? How is the sensory-motor circuitry organized? Sensory input
Motor output
5
Stretch reflex Reciprocal innervation and synergist connections
6
Stretch reflex Reciprocal innervation and synergist connections
Simplify the commands from higher levels necessary to control of voluntary movements Corticospinal connexions can modulate the reciprocal connectivity
7
Stretch reflex Reciprocal innervation and synergist connections
Simplify the commands from higher levels necessary to control of voluntary movements Corticospinal connexions can modulate the reciprocal connectivity
8
Withdrawal reflex Reciprocal innervation and synergist connections
Simplify the commands from higher levels necessary to control of voluntary movements Corticospinal connexions can modulate the reciprocal connectivity Cross-connections Coordination necessary for the control of posture
9
Vertical Connections Reciprocal innervation and synergist connections
Simplify the commands from higher levels necessary to control of voluntary movements Corticospinal connexions can modulate the reciprocal connectivity Cross-connections Coordination necessary for the control of posture
10
Convergence of sensory informations
Reciprocal innervation and synergist connections Simplify the commands from higher levels necessary to control of voluntary movements Corticospinal connexions can modulate the reciprocal connectivity Cross-connections Coordination necessary for the control of posture Convergence of sensory input
11
Are reflexes streotyped ?
Corticospinal connections can shape the reflexes in order to adapt to different contexts
12
Conclusion Spinal cord circuitry forms the infrastructure that is exploited by supraspinal areas in order to coordinat different muscle The input output relation is far from a streotyped relation Since it can be shaped in order to adapt to the behavioral states of the organism
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.