~BN19 motor spinal control

~BN19 motor spinal control - Spinal Control of Movement...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Spinal Control of Movement Lesson 19
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Anatomy Ventral Spinal Cord Topographic organization Alpha motor neurons Spinal interneurons Striate muscle extrafusal fibers ~ Proximal limbs Distal limbs
Background image of page 2
Alpha Motor Neurons Or lower motor neurons (Class I) Cell body in ventral horn Emerge from ventral root Innervate extrafusal fibers Uninterrupted to muscle fibers final common pathway Only excitatory input to muscles Inhibition at spinal cord ~
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Dorsal Ventral Extrafusal Fibers ACh     Alpha  Motor neuron
Background image of page 4
Input to Alpha Motor Neurons 3 sources only 1. DRG neurons sensory neurons (proprioception) feedback from muscle spindles 2. Upper motor neurons primarily from M1 3. Spinal interneurons generation of motor programs ~
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Inputs to Alpha Motor Neurons Dorsal Ventral Spinal interneurons DRG Sensory neurons Upper motor neurons - M1
Background image of page 6
Neuromuscular Junction
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/24/2011 for the course STEP 1 taught by Professor Dr.aslam during the Fall '11 term at Montgomery College.

Page1 / 20

~BN19 motor spinal control - Spinal Control of Movement...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online