Parker SG (Orbit) Flashcards
What bones make up the roof of the orbit?
- Orbital Plate of Frontal Bone
2. LESSER wing of sphenoid
What bones make up the lateral wall of the orbit?
- Zygomatic
2. GREATER wing of sphenoid
What bones contribute to the medial wall of the orbit?
- Frontal
- Ethmoid
- Lacrimal
- BODY of sphenoid
(pre-study guide adds palatine)
What bone makes up the floor of the orbit?
- Maxilla
pre-study guide adds palatine
What 5 muscles are innervated by oculomotor n. (CN III)?
Upper:
- Superior Rectus
- Levator Palpebrae Superioris
Lower:
- Medial Rectus
- Inferior Rectus
- Inferior Oblique
What do the 4 rectus mm. originate from?
- Common Tendinous Ring
What 3 mm. aDduct the eye?
- Superior, Inferior, Medial Rectus
What 3 mm. aBduct the eye?
- Superior, Inferior Oblique
- Lateral Rectus
What 2 mm. elevate the eye?
Superior Rectus, Inferior Oblique
What 2 mm. depress the eye?
Inferior Rectus, Superior Oblique
SO4LR6
Superior Orbital (IV) Lateral Rectus (VI)
What nerve passing through the supraorbital fissure contains GSA fibers?
Opthalmic n. (V1)
What are the 3 branches of opthalmic n. (V1) in the orbit?
- Frontal n. (V1)
- Lacrimal n. (V1)
- Nasociliary (V1)
What artery runs with the nasociliary n. (V1)?
Opthalmic a.
What neurovascular structures cross the Optic n. (CN II)?
- Opthalmic a. (traveling with…)
2. Nasociliary n. (V1)
What 5 branches of the nasociliary n.?
- Anterior Ethmoid n.
- Posterior Ethmoid n.
- LONG ciliary nn.
- Sensory Root to Ciliary Ganglion
- Infratrochlear n.
What hitchhiker travels with the lacrimal n.?
- Ganglia
- Preganglionic
- Postganglionics
Preganglionic:
Greater Petrosal n. (CN VII) –> Nerve of Pterygoid Canal –> PTERGOPALATINE GANGLIA
Postgangionic HITCHHIKERS:
Infraorbital n. —> Zygomatic n. –> Lacrimal n. (via communicating branch)
What are the parasympathetic preganglionic to the orbit?
- associated ganglia
CN III - Oculomotor
CN VII - (greater pet.)
ganglia:
- Ciliary
- PPG
What are the parasympathetic preganglionics to the PP Fossa?
- associated ganglia
CN VII - (greater pet.)
ganglia:
- PPG
What are the parasympathetic pregangionics to the IT Fossa?
- associated ganglia
CN VII - (Chorda Tympani)
CN IX - Lesser Pet.
ganglia:
- PPG
- Otic
What 3 fiber types are received by the ciliary ganglion?
- How do they get there?
Sympathetic Root:
Postganglionic Sympathetics - via opthalmic a.
GSA Root:
- Nasociliary n. via its sensory root
Parasympathetic Root:
- Pregalionic GVE fiber from CN III parasympathetic motor root
What two structures are linked by the short ciliary fibers?
- fiber type
- Ciliary ganglion to Globe
**???
What two structures are linked by the Long Ciliary Fibers?
- Nasociliary n. to Globe
**Direct GSA branches
What fiber type dilates the pupil?
Sympathetics
What fiber type constricts the pupil and accomadates the pupil?
Parasympathetics
What structures travel through the superior orbital fissure?
- Oculomotor (CN III)
- Trochlear (CN IV)
- Opthalmic n. (CN V1)
- Abducens n. (CN VI)
- Superior and Inferior Opthalmic vv.
How does the optic n. (CN II) enter the orbit?
- what comes with it?
- Through the Optic Canal
- Opthalmic a. travels with Optic n.
What 4 neurovascular structures enter the optic canal above the tendinous ring?
- Frontal n. (V1) => Opthalmic (V1)
- Lacrimal n. (V1) => Opthalmic (V1)
- Troclear n. (IV)
- Superior Opthalmic v.
What 6 neurovascular structures enter the optic canal INSIDE the tendinous ring?
- Optic n. (CN II)
- Opthalmic a. => INTERNAL carotid
- Abducens n. (CN VI)
- Upper Division CN III
- Lower Division CN III
- Nasociliary n. => Opthalmic (CN V1)
What 1 thing enters the orbit below the tendinous ring?
- Inferior Opthalmic a.
What is anything tagged in the floor of the sphenoid sinus going to be?
N. or A. of the Pterygoid Canal
T or F: the opthalmic a. is a branch of the external carotid a.
False, it comes from the INTERNAL carotid
What vascular structure can cause bulging of the eyes?
Infections in the cavernous sinus preventing flow from opthalmic veins putting pressure on the eyes
