The Meninges and Dural Venous sinuses
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| What are the three tissue layers covering the brain (deep to superficial)? | show 🗑
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| What two layers make up the dura mater of the skull? | show 🗑
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| show | Foramen magnum; skull
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| Describe the meningeal layer of the dura mater proper | show 🗑
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| What other membrane is the meningeal layer of the dura mater continuous with outside of the skull? | show 🗑
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| The meningeal layer sends inward (how many?) dural foldings (septa) which separate the regions of the brain; what are they? | show 🗑
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| show | falx cerebri
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| What are the attachments of the falx cerebri? | show 🗑
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| Crescent shaped fold which separates the occipital lobes of the brain from the cerebellum | show 🗑
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| show | tentorial notch; allows for passage of the midbrain
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| What are the attachments of the tentorium cerebelli? | show 🗑
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| What is attached to the superior surface of the tentorium cerebelli? | show 🗑
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| Small, sickle shaped fold lying inferior to the tentorium cereblli | show 🗑
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| What does the falx cerebelli separate? | show 🗑
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| show | Diaphragma sellae
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| show | Infundibular stalk of the hypophysis
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| show | Endothelium lined spaces between periosteal and meningeal layers of the dura mater; all blood from the brain eventually drain through them to the internal jugular veins
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| * What areas are drained by the dural venous sinuses? | show 🗑
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| Where is the superior sagital signus? Where does it begin? | show 🗑
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| show | superior sagital, straight, occipital, and transverse sinuses
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| What are the venous lacunae? | show 🗑
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| * What are arachnoid granulations? | show 🗑
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| show | Occupies the free inferior margin of the falx cerebri
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| Where does the inferior sagittal sinus continue into? | show 🗑
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| What does the great cerebral vein of galen do? | show 🗑
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| show | Occupies the line of junction between the falx cerebri and the tentorium cerebelli; joins the confluens of the sinuses
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| show | Paired structures that begin at the internal occipital protuberance and course along the attached margins of the tentorium cerebelli
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| Where do the transverse sinuses drain? | show 🗑
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| show | Direct communications of the TRANSVERSE SINUSES, forming s-shaped grooves in the temporal and the occipital bones; coninues in the jugular foramen as the INTERNAL JUGULAR VEIN
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| Where are the cavernous sinuses? | show 🗑
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| show | The superior and inferior opthalmic veins; sphenoparietal sinuses; and cerebral veins
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| The cavernous sinuses are drained by ... | show 🗑
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| show | Pituatary gland (middle), CN III, IV, VI, and V1 and V2; and the internal carotid artery
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| The pia-arachnoid membrane and the pia mater develop from a single embryonic membrane know as the _____ | show 🗑
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| show | A delicate, impermeable membrane separated from the dura by a potential space, the subdural space and from the pia mater by the subarachnoid space
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| show | Cerebrospinal fluid; choroid plexuses
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| What are the arachnoid villi? | show 🗑
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| show | Yes; closely invests the brain
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| Describe the blood supply to the dura mater | show 🗑
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| show | Meningeal branches of the anterior ethmoidal nerve from the opthalmic nerve (CN V1) [floor and anterior parts of the falx cerebri]; tentorial branch of opthalmic nerve [tentorium cerebelli and posterior part of falx cerebri]
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| * What nerves supply the middle cranial fossa | show 🗑
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| show | Meningeal branches of the FIRST THREE CERVICAL NERVES; enter fossa through foramen magnum, jugular foramen [past vagus], and hypoglossal canal [past hypoglossal];
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| Do the meningeal nerve branches carry any sympathetics? | show 🗑
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| Of the following, which is enervated with sensory nerve endings: brain, pia mater, arachnoid, dura mater? | show 🗑
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| show | Important structures pass through it (see previous question); communicate ant. with facial vein via opthalmic veins and inferiorly with pterygoid venous plexus and posteriorly with basilar plexus (communicates with internal vertebral plexus); NO VALVES :(
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| show | injuries to the meningeal arteries (esp. middle meningeal)-->blood collects between periosteal layer of dura mater and skull-->intercranial pressure rises-->clot may exert pressure on motor area of cerebral cortex
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| Describe the clinical significance of a subdural hematoma | show 🗑
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| show | Results from leakage of blood into subarachnoid space. Often results in leakage or rupture of congenital aneurysm on circle of Willis
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Created by:
karkis77
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