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Flashcards in orbit Deck (15):

extrinsic (extra-ocular) muscles

1. levator palpebrae superioris

2. superior rectus
3. inferior rectus
4. lateral rectus
5. medial rectus
6. superior oblique
7. inferior oblique

moving of eyeball and raising upper eyelids


blood supply, venous drainage and innervation of orbital cavity

blood supply
- internal carotid artery
- ophthalmic artery (branch of internal carotid artery)

- inferior ophthalmic vein
- superior ophthalmic vein

- optic nerve
- ophthalmic nerve and its branches (V1)
- trochlear nerve
- oculomotor
- abducens
- autonomic nerves


extradural/epidural hemorrhage

meningeal arterial damage (in temporoparietal region)

forms between skull and dura mater

associated with skull fracture


can shift falx cerebri


subdural hemorrhage

damage to cerebral veins
(that cross this space from brain to superior sagittal sinus can cause this bleed)

forms between dura mater and arachnoid mater

can shift lateral ventricles


subarachnoid hemorrhage

bleed in subarachnoid space

cerebral arterial damage/intracerebral bleed
-ruptures cerebral artery aneurysm of circle of willis

causes sudden severe headache, vomiting and loss of consciousness


superior sagittal sinus

empty into right transverse sinus via confluence of sinues

located in superior border of falx cerebri


inferior sagittal sinus

empty into straight sinus (joined by great cerebral vein

located in inferior border of falx cerebri


straight sinus

empty into left transverse sinus via confluence of sinuses

located at the junction of falx cerebri and tentorium cerebelli


confluence of sinuses

empty into transverse sinuses (recieves from superior sagittal, straight, occipital sinus)

dilated space at the internal occipital protuberance


transverse sinus

empty into sigmoid sinuses

along the posterior and lateral attachments of the tentorium cerebelli


sigmoid sinus

empty into internal jugular veins

groove of parietal, occipital and temporal bones

continuagtion of transverse sinus


cavernous sinuses

empty into superior and inferior petrosal sinus

located at the lateral aspect of body of sphenoid

has connections with veins from outside of the skull (cerebral, ophthalmic, emissary veins) which provide connectional pathways for infections to pass from extracranial sites to intracranial locations


what is the difference between the intracranial and intra-spinal dura mater

intracranial dura mater
-has both periosteal and meningeal layer

-only has meningeal layer of dura mater (periosteal seals skull)


what structures run within the cavernous sinus

- internal carotid artery
- abducens nerve


what structures run within the wall of the cavernous sinus

- V1
- V2
- oculomotor
- trochlear