General Concepts Meninges Flashcards
What are the three membranes that line the skull and vertebral canal and enclose the brain and spinal cord?
meninges: dura mater, arachnoid, pia mater
Arachnoid + pia mater = ?
leptomeninges
Why is there no epidural space within the skull?
cranial dura is fused to periosteum
Within the vertebral canal, the dura mater and periosteum are separated, leaving what?
a fat-filled epidural space
What specialized fold of the dura mater extends into the longitudinal cerebral fissure and contains dorsal sagittal sinus?
Falx cerebri
What specialized fold of the dura mater extends into the transverse cerebral fissure?
tentorium cerebelli
What part of the leptomeninges is intimately attached to the surface of the CNS – extends into depths of sulci, fissures, crevices, etc?
Pia mater
What part of the leptomeninges lines deep surface of dura mater?
Arachnoid
What traverses the subarachnoid space, which contains cerebrospinal fluid?
arachnoid trabeculae
What are the thickened longitudinal cord of Pia on lateral margin of spinal cord which segmentally attaches to the dura and arachnoid, and thus, suspends the spinal cord?
denticulate ligaments
What is the narrow cord of meninges that attaches conus medullaris to the caudal vertebrae?
filum terminale
What is the compact mass of Pia, capilliaries, and ependymal epithelium that produces CSF by secretion and ultrafiltration and is present within each ventricle?
Choroid plexus
What is the CSF flow starting at lateral ventricles?
choroid plexus –> lateral ventricle –> interventricular foramen –> third ventricle –> mesencephalic aqueduct –> fourth ventricle –> lateral apertures or central canal –> subarachnoid space –> arachnoid villi –> venous sinus
