meninges
DESCRIPTION
about meningesTRANSCRIPT
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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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