Spinal cord organization
Download
1 / 36

Spinal Cord Organization - PowerPoint PPT Presentation


  • 225 Views
  • Updated On :

Spinal Cord Organization. January 9, 2008. Spinal Cord 31 segments terminates at L1-L2 special components - conus medularis - cauda equina no input from the face. Spinal Cord, Roots & Nerves. Dorsal root. Ventral root. Spinal nerve. Dorsal Root Ganglion.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Spinal Cord Organization' - kina


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Spinal cord organization l.jpg
Spinal Cord Organization

January 9, 2008


Slide2 l.jpg
Spinal Cord 31 segments terminates at L1-L2 special components - conus medularis - cauda equina no input from the face


Spinal cord roots nerves l.jpg
Spinal Cord, Roots & Nerves

Dorsal root

Ventral root

Spinal nerve


Dorsal root ganglion l.jpg
Dorsal Root Ganglion

Cell bodies of 1st order sensory neurons

Afferent


Spinal cord cross section l.jpg
Spinal Cord Cross Section

Dorsal root

sensory

afferent

motor

efferent

Ventral root


Cross section of spinal cord l.jpg
Cross Section of Spinal Cord

White matter

peripheral

Gray matter

central

Central canal


Volume of gray white matter l.jpg
Volume of Gray & White Matter

Gray matter enlarges at cervical and lumbar regions.

White matter increases at higher levels of the cord.


Central gray matter l.jpg
Central Gray Matter

Motor neurons

2nd order sensory neurons

Interneurons

Glial cells

Motor neuron = lower motor neuron

= anterior horn cell

= second order motor neuron


Organization of gray matter l.jpg
Organization of Gray Matter

Pain

Temperature


Organization of gray matter10 l.jpg
Organization of Gray Matter

Position sense

Vibration

Pressure

Touch


Organization of gray matter11 l.jpg
Organization of Gray Matter

Position sense

from legs

Between T1 and L2 enlarged

Dorsal nucleus of Clarke

2nd order sensory neuron going to cerebellum

Neck & base of Posterior Horn


Organization of gray matter12 l.jpg
Organization of Gray Matter

Interomedio-lateral horn

Between T1 and L2 enlarged

Sympathetic neurons

(preganglionic)

Intermediolateral Horn



Organization of gray matter14 l.jpg
Organization of Gray Matter

.

At S2, S3, and S4

Parasympathetic neurons

(preganglionic)

Intermediolateral Horn



Organization of gray matter16 l.jpg
Organization of Gray Matter

Modulates motor activity via gamma motor neurons

Adjusts briskness of deep tendon reflexes


Organization of gray matter17 l.jpg
Organization of Gray Matter

Nuclei of alpha and gamma motor neurons

Innervates muscle spindles and muscles


Lower motor neurons l.jpg
Lower Motor Neurons

Alpha motor neurons

originate from Rexed lamina IX

ventral – dorsal organization

ventral  extensor muscles

dorsal  flexor muscles

medial – lateral organization

medial  proximal muscles

lateral  distal muscles




Breathing l.jpg
Breathing

Nuclei of alpha and gamma motor neurons

LMNs from spinal levels C3, C4 & C5 innervate the phrenic nerve

Controls diaphragm


Control functions l.jpg
Control Functions

Nuclei of alpha and gamma motor neurons

At levels S1 - S4 LMNs form Onuf’s nucleus

Innervates anal and urethral spincters; needed for sexual function



Configuration of gray matter l.jpg
Configuration of Gray Matter

Abundant white matter high in the spinal cord

Enlargement of gray matter at the cervical level

Innervates arm muscles


Configuration of gray matter25 l.jpg
Configuration of Gray Matter

Enlargement in thoracic region for sympathetic neurons

Enlargement in lumbar region for motor neurons to the legs

Minimal white matter at the lower cord


Descending motor pathway l.jpg
Descending Motor Pathway

Upper motor neuron

1st order neuron

synapses on LMN

Crossed pathway

Lateral corticospinal

Uncrossed pathway

Anterior corticospinal



Spinal cord tracts l.jpg
Spinal Cord Tracts

Unconscious position sense

movement

feedback


Ascending descending tracts l.jpg

Sensory

Gracile tract

Leg position & vibration

Cuneate tract

Arm position & vibration

Dorsal spinocerebellar tract

Strength & muscle speed

Ventral spinocerebellar tract

Modulation; interneurons

Lateral spinothalamic tract

Pain & temperature

Anterior spinothalamic tract

Light touch

Spinocervical thalamic tract

Kinesthetic movement & discriminative touch

↓Motor

Corticospinal tract

Speed & agility

Reticulospinal tract

Differential facilitation of motor neurons

Rubrospinal tract

Fix movement errors

Lateral vestibulospinal tract

Extensor & posture

Medial vestibulospinal tract

Flexor & head position

Tectospinal tract

Head turning

Ascending & Descending Tracts


Ascending tracts l.jpg
Ascending Tracts

Sensory

Position Vibration

Sensory

Pain Temperature


Spinal cord injury l.jpg
Spinal Cord Injury

Position

Pain

Brown – Sequard Syndrome





Traumatic spinal cord injury l.jpg
Traumatic Spinal Cord Injury

DUI: $100 addt’l fine

South Carolina

Spinal Cord Injury

Research Board


Monday l.jpg
Monday

Brainstem


ad