Orbit Flashcards
What is the white portion of the eye?
Sclera
What structure determines eye color?
Iris
What is the technical name of eyelid?
Palpebrae
What is the inner-surface of the eyelid?
Conjunctiva
What recesses surround the eyeball?
Fornices
What are the steps of the lacrimal system?
- Lacrimal glands produce tears
- Tears course over globe and collect in lacrimal papilla
- Lacrimal papilla drain into lacrimal canaliculi
- Lacrimal canaliculi drain into lacrimal sac
- Lacrimal sac drains into inferior meatus of nose via nasolacrimal duct
What muscles does abducens innervate?
- Lateral rectus
What muscles does accessory innervate?
- Trapezius
2. Sternocleidomastoid
What is the clinical significance of long ciliary nerves?
They provide the afferent innervation involved in the corneal reflex test (irritating one eye
What is the clinical significance of long ciliary nerves?
They provide the afferent innervation involved in the corneal reflex test (irritating one eye stimulates a reflex where both eyes blink)
What is the clinical significance of long ciliary nerves?
They provide the afferent innervation involved in the corneal reflex test (irritating one eye stimulates a reflex where both eyes blink).
What does the corneal reflex test check?
- Trigeminal nerve (sensory)
2. Facial nerve (blink)
What is the function of short ciliary nerve?
(Goes through ciliary ganglion)
Autonomic innervation of eye (sympathetic dilates, parasympathetic constricts)
What is the function of long ciliary nerve?
(Does not go through ciliary ganglion)
Sensory innervation to eye
What is a symptom of intracranial pressure that can be observed about the eye?
Papilledema (swelling of optic nerve disc due to edema of optic nerve caused by obstruction of central retinal veins as they cross subarachnoid space - increasing capillary pressure)
