orbit Flashcards
what is the function of the conjunctiva
Protects the eye.
Covers inside of eyelid and sclera
Creates the mucous that forms part of tears
what are the three layers of the eye
- fibrous
- vascular
- neural
what is in the fibrous layer of the eye
cornea and sclera
what is in the vascular layer of the eye
choroid
ciliary body
iris
what is the function of the ciliary body
accommodation - ciliary muscles
what is the function of the sclera
recieves extra-ocular muscles
has optic nerve
what is the function of the iris
constricts and dilates the muscle of the pupil
what happens to pupil in bright light
pupil contricts as circular muscles of iris contract
what happens to the pupil in dim light
pupil dilates as radial muscles of iris contract
what is in the neural layer of the eye
retina
what is the macula lutea/fovea
part of retina responsible for visual acuity
which contains very high concentration of cones. These are the light-sensitive cells in the retina that give detailed central vision
what bones are in the orbit
frontal, zygomatic, maxillary, ethmoid, sphenoid, lacrimal
what is the function of the aqueous humor
keeps eye inflated and provides nourishment
what is the lateral wall of the orbit
infratemporal fossa
what is the floor of the orbit
maxillary sinus
what is the function of the orbital rim
to protect the contents of the orbit and provide attachment site for orbital septum
what are the extra-ocular muscles to the fibrous ring at back of orbit
superior rectus
medial rectus
lateral rectus
inferior rectus
what is the function of the superior rectus
rotate eye superiorly
what is the function of the medial rectus
adducts eye
what muscle abducts the eye
lateral rectus
what is the function of the inferior rectus
rotate eye inferiorly
what are the extra-ocular muscles that ar not attached to the ring
supeior and inferior obliques
what is the function of the superior oblique
causes eye to torque inward and inferiorly
what is the function of the inferior oblique of eye
torques the eye downward and laterally
what is the function of the levator palpebrae superioris muscle
elevates eyelid during eye opening
what is the suspensory ligament of lockwood
The suspensory ligament is slung like a hammock below the eye-ball. It is formed by the union of margins of the sheaths of the inferior rectus and the inferior oblique muscles with the medial and lateral check ligaments
what is the function of the optic nerve
Senses the incoming light and image displayed on the retina and transmits this image into the cerebral cortex
works with oculomotor nerve to change pupil size
what does the oculomotor nerve innervate within eye
superior rectus muscle
medial rectus muscle
inferior rectus muscle
inferior oblique muscle
levator palpebrae superioris muscle
ciliary muscle
sphincter muscle.
what sinus does the oculomotor nerve pass through
cavernous sinus
what does the trochlear nerve innervate in the eye
superior oblique muscle
what is the function of the trigeminal nerve in the eye
provides sensory innervation to the eye
what does the abducens innervate in the eye
lateral rectus muscle
what is the function of the facial nerve in the eye
for eye closure and blinking by the motor innervation of the orbicularis oculi muscle
what is the first branch of the ophthalmic artery
central retinal artery
what does the central retinal artery supply
nerve fibres in the optic nerve and inner layers of retina
what is the largest branch of the ophthalmic artery
lacrimal artery
what are the branches of the ophthalmic artery
central retinal artery, lacrimal artery, posterior ciliary arteries, inferior and superior muscular vessels, supraorbital artery, emthoid artery, medial palpebral vessels and terminal artery
what does the lacrimal artery supply
eyelids, lacrimal gland, and conjunctiva.
what supplies the posterior uveal tract
posterior ciliary arteries
what supplies the extraocular muscles
inferior and superior muscular vessels
what does the supraorbital artery supply
skin of forehead and levator palpebrae muscle
