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Spinal Cord. Medical Neuroscience Dr. Wiegand. Directions. dorsal. rostral. ventral. caudal. Terms. rostral - toward the “beak” caudal - toward the “tail” ventral - toward the front (anterior) dorsal - toward the back (posterior) superior - above inferior - below. Ascending tracts.

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spinal cord

Spinal Cord

Medical Neuroscience

Dr. Wiegand

directions
Directions

dorsal

rostral

ventral

caudal

terms
Terms
  • rostral - toward the “beak”
  • caudal - toward the “tail”
  • ventral - toward the front (anterior)
  • dorsal - toward the back (posterior)
  • superior - above
  • inferior - below
spinal cord1

Ascending

tracts

Descending

tracts

Cell bodies

Peripheralnervefibers

Spinal Cord
  • Central gray nuclei and outer white matter (tracts)
spinal nerves cord
Spinal nerves & cord
  • 31 pairs with anterior and posterior root
  • C1 often doesn’t have posterior root
  • Spinal cord enlarged in C5 – T1 and L2 – S3 levels
  • Spinal cord ends at L1 vertebral level
dermatomes myotomes
Dermatomes & Myotomes
  • Dermatome – an area of skin innervated by a single posterior root
  • Myotome – a group of muscles innervated by a single anterior root
slide9

C4

T4

T10

L3

L5

Myotomes

Dermatomes

stretch reflexes
Stretch Reflexes
  • Examples:
    • C5-6 = biceps tendon
    • C6 = brachioradialis
    • C7-8 = triceps tendon
    • L2-4 = patellar tendon
    • S1-2 = Achilles tendon
external spinal cord

Conus medullaris

Filum terminale

Cauda equina

Dura mater

External Spinal Cord
external structure spinal cord

Posterior Median Sulcus

Posterior

IntermediateSulci

Lateral sulci

Anterior Median Fissure

External Structure – Spinal Cord
white matter organization ascending pathways

Posterior Columns

Lateral & Anterior

Spinothalamic

Tracts

f. gracilis

f. cuneatus

Posterior &

Anterior

Spinocerebellar

Tracts

White Matter Organization:Ascending Pathways
white matter organization descending pathways

Lateral

Corticospinal

Tract

Rubrospinal

Tract

Reticulospinal

Tracts

Anterior

Corticospinal

Tract

VestibulospinalTracts

White Matter Organization:Descending Pathways
white matter organization ascending pathways1

Posterior Columns

Lateral & Anterior

Spinothalamic

Tracts

L T A N

L

N

White Matter Organization:Ascending Pathways
grey matter organization

Posterior

Motor Groups

Intermediate

Anterior

Lateral

Medial

Grey Matter Organization
grey matter organization posterior cell column

Dorsomarginal nucleus

Substantia gelatinosa

Nucleus proprius

Nucleus dorsalis

(Clarke’s column)

Grey Matter Organization:Posterior Cell Column
slide24

From Pritchard &

Alloway: Fig. 3-7

rexed lamina

Dorsomarginal n.

Substantia gelatinosa

Nucleus proprius

Nucleus dorsalis

(Clarke’s column)

Motor nuclei

Rexed Lamina
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