7-10 orbit
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| What bones form the lateral side of the orbit? | Zygomatic and frontal
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| What bones form the medial side of the orbit? | Lacrimal, ethmoid, and maxilla
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| What bone forms the superior side of the orbit? | Frontal
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| What bones form the inferior side of the orbit? | Maxill and zygomatic
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| What bone forms the posterior side of the orbit? | Sphenoid
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| What artery branches off the internal carotid artery? | Ophthalmic artery
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| What artery branches off the ophthalmic artery? | Central artery of the retina
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| Why is the eye very fatty? | Protection and movement
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| What drains into the lacrimal sac which is in the lacrimal bone? | Lacrimal canaliculi
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| Where is the lacrimal gland located? | Superior and lateral
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| What part of the eye does chronic dry eyes effect? | Cornea
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| What is the optic nerve an extension of? | Forebrain
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| What does the facial nerve go through before it innervates the facial muscles? | Stylomastoid foramen
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| What other foramen, besides the carotid canal, is the internal carotid artery associated with? | Foramen lacerum
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| What is termed as the "truck stop"? | Pterygopalatine ganglion
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| What nerve is in charge of the special sensory/taste from anterior 2/3 of the tongue? | Chorda tympani nerve
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| Is the greater petrosal nerve parasympathic or sympathetic? | Parasympathetic (presynaptic)
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| Is the deep petrosal nerve parasympathic or sympathetic? | Sympathetic (postsynaptic)
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| What is the lacrimal nerve a branch of? | Ophthalmic (CN V1)
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| What is the zygomatic nerve a branch of? | Maxillary (CN V2)
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| Where do the rectus muscle originate? | Common tendinous ring
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| Where do the rectus muscles insert? | Sclera
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| Levator palpebrae superioris OINA | O- lesser wing of sphenoid
I- superior tarsus and skin of superior eyelid
N- oculomotor
A- elevate superior eyelid
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| Superior oblique OINA | O- body of sphenoid
I- fibrous ring then inserts on sclera
N- trochlear
A- abducts, depresses, medially rotates
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| Inferior oblique OINA | O- anterior part of orbit
I- sclera
N- oculomotor
A- abducts, elevates, laterally rotates
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| Superior rectus OINA | O- common tendinous ring
I- sclera
N- oculomotor
A- adducts, elevates, medially rotates
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| Inferior rectus OINA | O- common tendinous ring
I- sclera
N- oculomotor
A- adducts, depresses, laterally rotates
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| Medial rectus OINA | O- common tendinous ring
I- sclera
N- oculomotor
A- adducts
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| Lateral rectus OINA | O- common tendinous ring
I- sclera
N- oculomotor
A- abducts
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| What does the trochlear nerve help you do? | Look down
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| If the trochlear nerve is damaged, what can be a result? | Diplopia
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| If the abducens nerve is paralyzed, what muscles take over? | Medical rotators
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| What nerve comes across from the other side of the brain? | Trochlear nerve
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| If a trochlear nerve injury occurs close to the brainstem, which eye will be effected? | Contralateral
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| What is the ciliary ganglion close to? | Optic nerve
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| What nerve is a branch of V1 and innervates the cornea? | Long ciliary nerve
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| What two muscles are intraocular muscles? | Dilator pupillae and sphincter pupillae
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| Do parasympathetic or sympathetic impulses go straight through the ganglion to intraocular vessels? | Sympathetic
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| What nerve is postsynaptic (sympathetic) and goes to the front of the eye? | Short ciliary nerve
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| What part of the eye is avascular so it is unable to repair itself? | Cornea
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| What part of the eye has high acuity? | Macula/fovea centralis
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| What are the two muscles of the iris? | Dilator pupillae and sphincter pupillae
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| If you lose parasympathetic impulses, what happens to the eye? | Eye stays dilated
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| What is the fovea centralis mostly made up of? | Cones
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| What part of the eye is the blind spot and is where the nerves come in? | Optic disk
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| What part of the eye is active in dim light? | Rods
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| What part of the eye is active in bright light? | Cones
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| What are the two branches of the frontal nerve? | Supraorbital and supratrochlear nerves
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| Why are clots possible in the facial veins? | No valves
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| What are the four veins that can potentially drain into the cavernous sinus? | Superior ophthalmic, inferior ophthalmic, pterygoid venous plexus, facial
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