Eye&Orbit--Exam III Flashcards
What is the muscle that closes the eye? What is it innervated by?
Orbicularis Oculi-VII.. Remember the “hook” thing?!
What is the muscle that opens the eye? What is it innervated by? What is the small muscle inside this muscle that is sympathetically innervated?
Levator Palpebrae Superioris-III. Remember III keeps the eye open?! The SUPERIOR TARSAL muscle is smooth muscle with in the LevPalpebrae that sympathetically keeps the eyes open
What are the function of the Tarsal Glands?
To produce a fatty secretion that will keep the eyelids from sticking together
What is the mucous membrane of the eyelid and eyeball?
The conjunctiva
What type of conjunctiva is continuous with the skin and is very vascular?
Palpebal Conjunctiva
What type of conjunctiva is transparent and is continuous with the cornea?
Bulbar Conjunctiva
Describe the sensory innervation to the upper eyelid
V1–>Lacrimal, Frontal–>SupraOrbital, SupraTrochlear
Describe the sensory innervation to the lower eyelid
V2–>Inferior Palpebral
Describe the blood supply to the upper eyelid
Internal Carotid–>Opthalmic–>SupraOrbital, SupraTrochlear
Describe the blood supply to the lower eyelid
Maxillary–>InfraOrbital–>Inferior Palpebral
Describe the Lacrimal Drainage System…
Tears from Lacrimal Gland–>Superior and Inferior Puncta–>Lacrimal Canal–>Lacrimal Sac–>NasoLacrimal Duct–>Nasal Cavity (Inferior Meatus)
Where does the lacrimal secretion drain into the nasal cavity?
Inferior Meatus
What are the three continuous outer layers of the eyeball?
The Dural Sheeth, Sclera, & Cornea
What is the layer in between the sclera and retina?
Choroid
What is the internal layer of the eyeball that contains the special receptors?
The Retina
What is the body where the termination of the choroid and the beginning of the iris takes place?
Ciliary Body
What produces Aqueous Humor (flows from anterior chamber to posterior chamber) of the eye?
The Ciliary Process
What muscles are in control of the lens? What are they innervated by?
The Cilliary muscles. They are Parasympathetically controlled by III
What are the two muscles of the Iris? What type of control for each?
Sphincter Pupillae–Parasympatheic (Poop/Sphincter…Get It?!) & Dilator Pupillae-Sympathetic(wide eyed and running from saber tooth tiger)
What are the “ligaments” that attach the lens to the ciliary muscles?
Suspensory Ligaments
What happens to the lens on CONTRACTION of the ciliary muscles?
ROUND lens
What happens to the lens on RELAXATION of the ciliary muscles?
FLAT lens (YOU LIE FLAT ON THE GOUND WHEN RELAXED)
Where is the most acute vision in the retna? What is the portion that makes the acute vision possible?
The macula lutea and the fovea centralis
What is the only eye muscle NOT apart of the CTR?
The inferior oblique
What direction does the Superior Oblique Pull? What region of the eyeball is the SO attached?
Down and Out. Attached to the Superior Lateral Posterior aspect of the eyeball
What direction does the Inferior Oblique pull?
Up and Out
What are the eye ball Adductors?
Medial Rectus (& Inferior/Superior Rectus to an extent)
What are the eyeball ABductors?
Superior & Inferior Obliques; Lateral Rectus
What are the eyeball elevators?
Superior Rectus and Inferior Oblique
What are the eyeball depressors?
Inferior Rectus and Superior Oblique
What are the 4 eyeball rotators?
S.O., I.O., I.R. S.R.
What are the two divisions of C.N. III when it enters the orbit? What does it innervate?
Superior: Superior Rectus, Levator Palpebrae Superioris
Inferior: Medial Rectus, Inferior Rectus, Inferior Oblique
What are the only NAMED post ganglionic nerves you will see? What CN are they involved with?
Short Ciliary Nerves…CN III
What is the test for the interaction between CN VII and CN V? What happens?
Coronal Reflex…Touching the cornea with cotton should make BOTH eyes blink..
