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Ocular A&P#2 Midterm

Questions for Ocular A&P (Click TARGETS to see slides!) : Adexa & Intro to Orbit

What is the thinnest bone of the ocular orbit? Maxillary
Name the three openings (foramen, fissure) in the orbit through which the nerves and vessels enter. Inferior orbital fissure, Optic canal (foramen), and Superior orbital fissure.
The optic nerve and ophthalmic artery enter through which opening? Optic foramen (canal)
The main cranial nerves to the eye and adnexa enter through which two openings? Inferior/superior fissure (orbital foramens)
What is the definition of adnexa (for the eye)? Appendages of the eyeball, which includes the eyelids, muscles and soft tissue.
The nerve to the mid face (maxillary division of 5th CN) leaves the orbit through which opening? Inferior fissure
What are the three main divisions of the Trigeminal (Vth CN)? V1 - Ophthalmic V2 - Maxillary V3 - Mandibular
Which line passes through the center of the cornea? Geometric axis
Where is the normal pupil light reflex located? Nasal to the center of the cornea.
What is the average axial length of the globe from the front of the cornea to the posterior sclera? 24.5mm
What is the average horizontal corneal diameter? 12.0mm
Why are the measurements for the axial length of the globe, from the front of the cornea to the posterior sclera, and the measurements for the corneal diameter important? It's important in determining size of anterior chamber for (IOL) intraocular lens implantation surgury.
Is the temporal bone part of the ocular orbit? No.
The trochlea is made up of ________ and acts as a pulley for the ________ muscle. Cartilage - Superior oblique
What is the thinnest bone, most likely to fracture? Maxilla
Which sinus borders the medial wall of the orbit? Ethmoid sinus
The ethmoid bone is located ______and being thin, makes the orbit susceptible to ________from the sinus. Medially - Infections
What is the muscle that closes the lids? Orbicularis Oculi
What is Bells phenomenon? A sign of peripheral facial paralysis, manifested by the upward and outward rolling of the eyeball when closing eyelid.
What is the definition of Lagophthalmos? Abnormal condition in which an eye can not close completely.
What is the dimensions of the palpebral fissure, approximately? 11mm
How long does it take for replacement lashes to grow to full size? 10 weeks
Gray line runs between the ________ and the _________. Cilia - Meibomian openings
What cranial nerve supplies the orbicularis oculi muscle for motor funcion? VII Facial
What cranial nerve supplies the orbicularis oculi muscle for sensation? V Trigeminal
What is the main muscle for raising the lid? Levator palpebral superior
Which CN supplies the levator palpebral superior with motor function? III Oculomotor CN
Which lid muscle is supplied by sympathetic innervation? Superior Tarsal Muscle of Mueller
Where are the meibomian glands located and what do they provide the tear film with? Tarsus - lipids (oil)
What is the disorder for the swelling of the meibomian glands called? Chalazion
What are the glands around the cilia and what is the inflammation of them called? Zeiss and Moll - Hordeolum (stye)
Which CN innervates the eyelids for sensation? V CN Trigeminal
Where is tenon's capsule located? Just beneath the conjunctiva
The conjuctival ______ cells produce the _______ layer of tear film. Goblet - Mucin
What allows the full lateral movement of the globe? The plica semilunaris *Is the floor of the lacrimal lake. Allows conjunctiva to stretch.
What does the lacrimal gland produce? The aqueous layer of the tear film
What action does the lysozyme in the tear film have? Antibacterial
What is the normal tear pH? 7.4
Where is the lacrimal gland located? In the superior temporal area of the orbit
The eyelids have a ___________ portion and a __________ portion separated by the ___________. Superior orbital(from tarsus to eyebrow) - Palbebral superior (Tarsal?, I think that's what that is) - Palbebral sulcrus (that crease that separates two parts of the eyelid)
Epicanthal lids are seen in Asians and may give an appearance of what? Pseudo strabismus
Created by: Leequa



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