Eye/ Augen Flashcards
bones that make up the orbit
frontal zygomatic maxilla nasal greater wing of sphenoid ethmoid palatine lacrimal
superior orbital fissure
Lazy French Tarts Lie Naked In Anticipation Of Sex Lacrimal nerve CN V1 Frontal nerve CN V1 Trochlear nerve CN IV Lacrimal artery Nasociliary nerve CN V1 Inferior ophthalmic vein Abducens nerve CN VI Oculomotor nerve CN III Superior ophthalmic vein
Inferior orbital fissure
inferior ophthalmic vein
optic canal
optic nerve CN II
ophthalmic artery
route of tears
lacrimal gland -> puncta (small opening) -> lacrimal canaliculi -> lacrimal sac -> nasolacrimal duct (via fossa for lacrimal sac) -> inferior meatus of nasal cavity
6 ocular muscles directions
__IO__ SR
LR_______MR
__SO__ IR_______nose
innervation of ocular muscles
SO4 LR6 AO3
CN III superior branch - SR, levator palpebrae superioris
CN III inferior branch - MR, IR, IO, ciliary ganglion
origin of ocular muscles
rectus muscles from common tendinous ring
inferior oblique from medial floor of orbit
superior oblique from body of sphenoid
muscles of eyelid
obicularis oculi CN VII - orbital (forceful), palpebral (gentle)
levator palpebrae superioris CN III parasympathetic (ciliary ganglion)
superior tarsal ophthalmic artery sympathetic (superior cervical ganglion)
iris muscles
sphincter pupillae
- circumferential fibres for pupil constriction (miosis)
- parasympathetic
dilator pupillae
- radial fibres for pupil dilation (mydriasis)
- sympathetic
eyeball coats
outer (fibrous) coat - dura mata, episclera, sclera, cornea middle (vascular) coat - ciliary and pupillae muscles, aqueous humour inner (neuronal) coat - retinal pigment epithelium
arterial supply of eye
ophthalmic artery (ICA) via optic canal central retinal branch pierces optic nerve to supply retina
venous drainage of eye
superior and inferior ophthalmic veins (via superior and inferior orbital fissures) -> cavernous sinus -> IJV
