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MENINGESMENINGES

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MENINGESMENINGES

• a protector system for SSP ( Encephalon, Cerebellum,MS) a packer membrane

• Consisted of 3 layer ( from outside into)• Duramater• Arachnoidmater/arachnoidea• Piamater• Duramater = pachymeninges• Arachnoidea + Piamater = Leptomeninges

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DURAMATERDURAMATERIn cavum cranii 2 layer:o Stratum/lamina endostealis

Attach tightly at bone periosteum forms cavum cranii up to foramen occipitalis magnum

o Stratum/lamina meningealis

layer in sticks at duramater lamina endostealis and arachnoidea

In canalis vertebraliso Only 1 layered only stratum/lamina meningealiso Doesn't stick at wall in vertebra boneso Duramater Medulla spinalis only until vertebra Sacralis 3o Hereinafter like string = PHYLUM TERMINALE EXTERNA to os.

coccygealis.

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DURAMATERDURAMATERThere is POTENSIAL space at Cranium :• Between duramater lamina endostealis and lamina

meningealis SPATIUM EPIDURALE ( contains a/v meningea + branchs of N.V)

• Between duramater lamina meningealis to arachnoidea SPATIUM SUBDURALE

In canalis vertebralis • Spatium epidurale between duramater lamina

meningealis and bone wall canalis (so=Spatium extradurale contains adipose tissue + plexus venosus vertebralis interna) like “ true/real” space

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DURAMATERDURAMATER• Duramater with arachnoidea arranges in layers

n.cranialis/n.spinalis when exit to each hole then attach at bone ( in each exit hole)

• Duramater in Cranium forms:• SINE VENOSUS ( between l.endostealis and l.meningealis)• 4 SEPTUM :1. FALX CEREBRI ( between the two top hemispherium cerebri, in fissura

longitudinalis cerebri)

2. TENTORIUM CEREBELLI ( dissociates lobus occipitalis cerebri and cerebellum)

3. FALX CEREBELLI ( between the two hemispherium cerebelli)

4. DIAPHRAGMA SELLAE ( above corpus sphenoidale)

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DURAMATERDURAMATER

SINUS VENOSUS

• Arranged in layers as endothel ( = vessel)

• Contains blood venosa

• It is blood flow system /venosa CNS

• place of having estuary veins intracranial + certain extracranial ( v.emissaria).

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KINDS OF SINES VENOSUS

1. S.sagittalis superior

2. S.sagittalis inferior

3. S.rectus

4. S.transversus

5. S.occipitalis

6. S.sigmoideus

7. S.petrosus superior

8. S.petrosus inferior

9. S.intercavernosus

10.S.cavernosus

11.S.sphenoparietalis

12.Confluens sinuum

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ARACHNOIDEA

• Consisted of 2 part:1.MEMBRANA ARACHNOIDEA ( sticks at

duramater lamina meningealis)

2.TRABECULA ARACHNOIDEA

- connective tissue braid to PIAMATER

-located in SPATIUM SUBARACHNOIDEUM

• Membrana Arachnoidea to piamater → form a cavity = SPATIUM SUBARACH NOIDEUM.

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SPATIUM SUBARACHNOIDEUM

Contains:

1. Artery and vein cerebri, diencephalon, cerebelli, truncus cerebri and medulla spinalis

2. Passed by n.cranialis + radix ventralis & dorsalis

3. Trabecula arachnoidea

4. Liquor cerebrospinalis (LCS)

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ARACHNOIDEA• In certain part spatium subarachnoideum

become wide CISTERNA

• Kinds of cisterna :1. Cisterna cerebellomedullaris/magna

2. Cisterna pontis

3. Cisterna interpeduncularis/basalis

4. Cisterna chiasmatis

5. Cisterna fossa cerebri lateralis

6. Cisterna superior/cisterna ambiens

7. Cisterna lumbalis

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ARACHNOIDEA

• VILLI ARACHNOIDALES ( Granulatio Arachnoidales) → jutty/villus formed by layer arachnoidea into sine sagittalis superior

• FUNCTION: place of excretion LCS from spatium subarachnoideum into blood to sine venosus

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PIAMATER

Arranges in layers surface direct of cortex cerebri, cerebellum,diencephalon, truncus cerebri & medulla spinalis

o Enter at sulcus/fissurao Follows vessel entering to sulcus/fissura forms

cortex including vessel forming plexus choroideus

Piamater medulla spinalis to lateral formed 2 sheet as LIGAMENTUM DENTICULATUM to arachnoidea

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VASCULARISATION

Vascularisation of intracranial Duramater :1. A. Meningea Anterior (branch of. a.eth.ant ←

a.ophtalmica)2. A. Meningea media (branch of.a.maxillaris int)3. Rm.meningea posterior ( branch.a.vert + a.ph.asc +

a.occ) Primarily → a.meningea media Venous → follow the artery Duramater + piamater → vasculer Arachnoidea → Avasculer

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INNERVATIONINNERVATION

INTRACRANIALPrimarily from branchs of N.VSome Of Nn.Craniales + N. Vagus inside CANALIS VERTEBRALIS

Nn. Spinales

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