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Flashcards in orbit Deck (15):
1

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

2

blood supply, venous drainage and innervation of orbital cavity

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

veins
- inferior ophthalmic vein
- superior ophthalmic vein

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

3

extradural/epidural hemorrhage

meningeal arterial damage (in temporoparietal region)

forms between skull and dura mater

associated with skull fracture

biconvex/lens-shape

can shift falx cerebri

4

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

5

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

6

superior sagittal sinus

empty into right transverse sinus via confluence of sinues

located in superior border of falx cerebri

7

inferior sagittal sinus

empty into straight sinus (joined by great cerebral vein

located in inferior border of falx cerebri

8

straight sinus

empty into left transverse sinus via confluence of sinuses

located at the junction of falx cerebri and tentorium cerebelli

9

confluence of sinuses

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

dilated space at the internal occipital protuberance

10

transverse sinus

empty into sigmoid sinuses

along the posterior and lateral attachments of the tentorium cerebelli

11

sigmoid sinus

empty into internal jugular veins

groove of parietal, occipital and temporal bones

continuagtion of transverse sinus

12

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

13

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

intracranial dura mater
-has both periosteal and meningeal layer

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

14

what structures run within the cavernous sinus

- internal carotid artery
- abducens nerve

15

what structures run within the wall of the cavernous sinus

- V1
- V2
- oculomotor
- trochlear