spinal cord

Spinal cordSpinal cord

ANATOMY OF SPINAL CORDANATOMY OF SPINAL CORD

Continuation of medullaContinuation of medulla

Within the vertebral canalWithin the vertebral canal

Upper border of atlas to lower Upper border of atlas to lower border of L1border of L1

CONUS MEDULLARISCONUS MEDULLARIS

MENINGEAL LAYERS AROUND THE MENINGEAL LAYERS AROUND THE SPINAL CORDSPINAL CORD

►Duramater …S2Duramater …S2►Arachnoidmater …S2Arachnoidmater …S2►Piamater …L1Piamater …L1

FILUM TERMINALEFILUM TERMINALE

Linea splendensLinea splendens

Ligamenta denticulataLigamenta denticulata

TRANSVERSE SECTION OF SPINAL CORDTRANSVERSE SECTION OF SPINAL CORD

SPINAL NERVES & SPINAL SPINAL NERVES & SPINAL SEGMENTSSEGMENTS

►Gives off 31 pairs of nervesGives off 31 pairs of nerves►C8 T12 L5 S5 Co1C8 T12 L5 S5 Co1►Cervical & lumbar enlargementsCervical & lumbar enlargements►CAUDA EQUINACAUDA EQUINA

►Does not correspond to the Does not correspond to the vertebral levelvertebral level

►Cervical….1 segmentCervical….1 segment►Upper thoracic….2 segUpper thoracic….2 seg►Lower thoracic….3 segLower thoracic….3 seg►Lumbar ….T11 &T12Lumbar ….T11 &T12►Sacral & Coccygeal….L1Sacral & Coccygeal….L1

INTERNAL STRUCTUREINTERNAL STRUCTURE

Grey matterGrey matter

Ventral horn cellsVentral horn cells

1.medial group 1.medial group

2.lateral group2.lateral group

3.central3.central

Dorsal horn cellsDorsal horn cells

1.Substantia gelatinosa of 1.Substantia gelatinosa of RolandoRolando

2.nucleus proprius2.nucleus proprius

3.Clarke’s column3.Clarke’s column

4.Marginal zone4.Marginal zone

► Intermediate zone Intermediate zone

1.Intermediolateral1.Intermediolateral

2.Intermediomedial2.Intermediomedial

REXED’S LAMINAREXED’S LAMINA► 10 LAMINA10 LAMINA

II Marginal zoneMarginal zone

IIII SGRSGR

III, IVIII, IV Nucleus propriusNucleus proprius

VV Neck of dorsal grey Neck of dorsal grey columncolumn

VIVI Base of dgcBase of dgc

VIIVII Intermed grey matterIntermed grey matter

VIII, IXVIII, IX Ventral hornVentral horn

XX Around central canalAround central canal

…….INTERNAL STRUCTURE.INTERNAL STRUCTURE

WHITE MATTERWHITE MATTER

Ascending tractsAscending tracts

1.Dorsal column tract-FG & FC1.Dorsal column tract-FG & FC

2.Spinothalamic tract-ANT & LAT2.Spinothalamic tract-ANT & LAT

3.Spinocerebellar tract-ANT & POST3.Spinocerebellar tract-ANT & POST

4.Spinotectal tract4.Spinotectal tract

5.Spino olivary5.Spino olivary

Descending tractsDescending tracts

1.Corticospinal tract-ANT & LAT1.Corticospinal tract-ANT & LAT

2.Vestibulospinal tract2.Vestibulospinal tract

3.Reticulospinal3.Reticulospinal

4.Rubrospinal tract4.Rubrospinal tract

5.Tectospinal tract5.Tectospinal tract

6.Olivospinal tract6.Olivospinal tract

Blood supplyBlood supply

►Anterior spinalAnterior spinal►2 Posterior spinal arteries2 Posterior spinal arteries►Arteria vasa coronaArteria vasa corona

►Main source of blood is the Vertebral Main source of blood is the Vertebral arteries……cervical arteries……cervical

►Radicular arteries…….spinal br. of Radicular arteries…….spinal br. of vertebral, asc cervical, deep cervical, vertebral, asc cervical, deep cervical, intercostal, lumbar and sacral artintercostal, lumbar and sacral art

►Arteria radicularis magnaArteria radicularis magna

DISTRIBUTION OF BLOOD SUPPLYDISTRIBUTION OF BLOOD SUPPLY

►Radicular art : grey & white matterRadicular art : grey & white matter►Anterior spinal : ant two-third Anterior spinal : ant two-third

ventral grey matter,part of dorsal ventral grey matter,part of dorsal grey matter,ant and lat funiculigrey matter,ant and lat funiculi

►Posterior spinal : post one-thirdPosterior spinal : post one-third

posterior horn and posterior posterior horn and posterior funiculusfuniculus

VENOUS DRAINAGEVENOUS DRAINAGE

1.Antmed 2.Antlat 3.Postmed 4.Postlat1.Antmed 2.Antlat 3.Postmed 4.Postlat

Venous vasa coronaVenous vasa corona

Radicular veinsRadicular veins

Epidural plexusEpidural plexus

inter vertebral veinsinter vertebral veins

Regional veinsRegional veins

………….thank you.thank you