Anesthesia for Eyes Flashcards
What is the outermost layer of the eye called?
Sclera
What surgery is the most common in the elderly?
Eye Surgery
What is the anterior-most portion of the eye called?
Cornea
What is the middle layer of the eye called?
Uveal Tract
What are the layers of the Uveal Tract?
- Choroid
- Iris
- Ciliary Body
What is the function of the Choroid?
A layer of blood vessels located posteriorly that provides blood flow to the eye
What can bleeding in the Choroid lead too?
Intraoperative Explusive Hemorhage
Where do sympathetic fibers of the iris originate from?
Carotid Plexus
Where do parasympathetic fibers of the iris originate from?
Oculomotor Nerve
The sympathetic fibers of the iris travel through the ciliary ganglion to innervate this muscle.
What does this muscle do when contracted?
- Dilator Muscle
- Contraction of Dilator Muscle dilates the pupil
The parasympathetic fibers synapse in the ciliary ganglion to innervate this muscle.
What does this muscle do when contracted?
- Iris Sphincter Muscle
- Contraction of iris sphincter causes pupillary constriction.
What does the ciliary body of the eye produce?
Aqueous Humor
What is the center of the eye filled with?
Vitreous Gel
How many extraocular muscles are there?
6 extraocular muscles
The ophthalmic artery is branched from where?
Branch from the internal carotid artery
What supplies the majority of blood to orbital structures?
Ophthalmic artery
The ophthalmic vein drains blood directly into a _________.
cavernous sinus
Which CN transmits neural signals from the retina?
Optic Nerve (CN II)
Which CN controls extraocular muscle movement?
- Oculomotor Nerve (CN III)
- Trochlear Nerve (CN IV)
- Abducens Nerve (CN VI)
Which CN is responsible for touch and pain sensation?
- Trigeminal Nerve (CN V)
Which CN is responsible for motor innervation to orbicularis muscle via zygomatic branch?
- Facial Nerve (VII)
A blockade on CN VII will prevent this from “squeezing”.
Eyelid
Which nerve provides sensation to the upper eyelid
Frontal branch of ophthalmic nerve
Which nerve provides sensation to the lower eyelid
Maxillary nerve