Exam II Lecture VII Flashcards
Layers of scalp
SCALP Skin Connective tissue Aponeurosis Loose areolar tissue Pericranium
Cutaneous nerve supply to scalp is via
Trigeminal nerve (CN V) Cervical spinal nerves: -Greater auricular -Greater occipital -Lesser occipital
Vascular supply to scalp via
Branches of external carotid
Branches of internal carotid
Branches of external carotid include
Occipital
Posterior auricular
Superficial temporal
Branches of internal carotid include
Supratrochlear
Supraorbital
Brain is supplied by what arteries - these arteries are located where and anastomose to form what
Two internal carotid arteries
Two vertebral arteries
Located in subarachnoid space
Anastamose to form circle of willis
Circle of willis function
Interconnects the internal carotid and vertebral system to create alternative routes for blood flow in case of blockage
Components of circle of willis
Internal carotid arteries
Anterior/posterior/middle cerebral arteries
Anterior/posterior communicating arteries
Spaces in brain superficial to deep
Epidural space Dura mater Subdural space Leptomeninx -arachnoid -pia mater
Anterior meningeal arteries are from
Ethmoidal arteries and internal carotid
Middle meningeal artery is from
Maxillary artery
Emissary veins are between
Dural venous sinuses and external veins
Blood vessels of meninges includes
Anterior/middle meningeal arteries
Emissary veins
Diploic veins
Cerebral veins
Is there any epidural space in the skull
No
Dura mater
Around spinal cord, dura mater forms a CT tube that is separated from the bone of the vertebral foramina by a space called epidural space
Dura mater serves as the ______ in the cranial cavity
Periosteum
Falx cerebri
Midline fold of dura mater between two cerebral hemispheres
Tentorium cerebelli
Dural folds between cerebellum and occipital lobes of cerebral hemispheres
Falx cerebelli
Dural fold between two cerebellar hemispheres
Diaphragma sellae
Dural fold over hypophyseal fossa
Dural sinuses are
Endothelial lined spaces between periosteal and meningeal layers of the dura
Superior sagittal sinus
Lies along superior margin of falx cerebri
Begins at crista galli and ends at occipital protuberence
Inferior sagittal sinus
Lies along inferior margin of falx cerebri
Ends in straight sinus
Straight sinus
Lies at intersection of falx cerebri and tentorium cerebelli
Formed at intersection of inferior sagittal sinus with great cerebral vein
Joins confluence of sinuses
Confluence of sinuses
Common confluence of superior sagittal, transverse, and straight sinuses
Transverse sinuse
Begins at confluence of sinuses
Extends along edges of tentorium cerebri
Right receives blood from superior sagittal
Left (dominant) receives blood from straight sinus
Sigmoid sinus
Continuations on either side of straight sinus
S shaped
End at jugular foramina
Become internal jugular veins
Cavernous sinus
Large venous plexus on each side of sella turcica
Superior petrosal sinus
Runs on either side from cavernous sinus to junction of transverse and sigmoid sinus
Inferior petrosal sinus
Run on either side from cavernous sinus to junction of sigmoid sinus and internal jugular vein
CSF flow chart
Choroid plexuses--> Ventricles--> Through apertures--> Into subarachnoid space--> Through arachnoid villi--> Into dural venous sinuses--> Into internal jugular veins
Space between the arachnoid and pia mater is _____ and is filled by
Subarachnoid space filled with CSF
What allows CSF to flow from subarachnoid space into dural sinuses
Arachnoid villi
What attaches arachnoid to pia mater
Delicate strands of CT arachnoid trabeculae
Pia mater is what layer
Innermost layer
Arterial supply to upper part of spinal cord
Anterior spinal artery
Sulcal branches
Posterior spinal arteries
Anterior spinal artery is from
Union of vertebral arteries
Sulcal branches that go into anterior median fissure are from
Anterior spinal artery
Posterior spinal arteries branch from
Vertebral arteries or posteroinferior cerebellar arteries
