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Anatomy Tables - Brain Tables.pdf - Medical Gross Anatomy...

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Medical Gross AnatomyAnatomy Tables - BrainStructuresMeningeal Structures & Spaces; Ventricular SystemStructureDescriptionSignificancearachnoid materthin layer, pressed againstinner surface of the duramater by cerebrospinal fluidpressurearachnids are spiders, the space deepto this layer has a spider web-likeappearancemeningesthree layers of tissuecovering brain & spinal cord- dura mater, arachnoidmater, & pia materdura matertwo types described whichdiffer in structure"tough mother"; it is the most durable ofthe meninges and provides support andprotection for the brain and spinal corddura mater, cranialoutermost covering of thebrain, described as 2 layers:periosteal outer layer andmeningeal inner layerdural venous sinuses lie betweenlayers of the cranial dura; meningeallayer forms folds that help to supportbrain: falx cerebri & cerebelli, tentoriumcerebellidura mater, spinaloutermost covering of thespinal cord, it forms the duralsac containing the spinalcord within vertebral canaldural sac ends at S2, coccygealligament (filum terminale externum)continues inferiorly to attach to coccyxepidural spacesurrounds dural sac withinvertebral canalcontains epidural fat & internalvertebral plexus of veinssubarachnoidspacebetween archnoid mater &pia materit contains cerebrospinal fluid andcobweb like filamentspia materlies on surface of the brain &spinal cord"delicate mother", it is the most delicateof the meninges, it has 2specializations: denticulate ligament &filum terminale internum
denticulateligamenta lateral extension of piamater from the spinal cordit attaches to the dura mater to anchorspinal cord; forms a scalloped freeborder; there are 2 (one on each side)filum terminaleinternuminferior extension of piamater from the conusmedullaris of the spinal cordit becomes enclosed within the filumterminale externumfilum terminaleexternuminferior extension of the duramater below the end of thedural sac at S2it attaches to the coccyx; also known asthe coccygeal ligamentventricle, lateralpaired spaces withincerebral hemispheresdrain cerebrospinal fluid to thirdventricle via interventricular foraminaventricle, thirdmidline space withindiencephalon betweenpaired dorsal thalami, abovehypothalamuscommunicates rostrolaterally withpaired lateral ventricles viainterventricular foramina,communicates posteroinferiorly withfourth ventricle via cerebral aqueductventricle, fourthmidline space betweencerebellum posteriorly andpons and upper medullaanteriorlycommunicates anterosuperiorly withthird ventricle via cerebral aqueduct,

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