The Orbit
What are the boundaries of the orbit? (medial, ventral, caudodorsal)
ventral- zygomatic salivary gland and pterygoid mm.
caudodorsal- temporal m.
What are the four areas surrounding the eyes?
Superior and Inferior palpebrae
medial and lateral commissures (canthi)
What percentage is the lacrimal gland and what percentage is the gland of the 3rd eyelid? (tear film?-powerpoint unclear)
70% and 30%
What are the chambers of the bulbus oculi
anterior chamber and the posterior chamber ---these contain aqueous humor
What are the muscles of the eye and what nerves innervate them?
Lateral rectus and retractor bulbi (VI), medial dorsal and ventral rectus and ventral oblique (III), dorsal oblique (IV)
What is the osseous margin formed by the frontal, lacrimal, and zygomatic bones ?
What lines the surface of eyelids?
What is the third eyelid?
Palpebral conjunctiva
plica semilunaris (3rd eyelid)- it is a concave fold of the palebral conjunctiva and cartilage protruding from medial angle of the eye
Whats the pathway for the lacrimal apparatus (7 steps)
lacrimal gland or gland of the third eyelid--- conjunctival sac--- superior and inferior lacrimal puncta--- lacrimal canaliculi--- lacrimal sac--- nasolacrimal duct--- nasal vestibule
What layer is the retina in?
the internal nervous coat
When the DO contracts, THIS action occurs whereas when the ventral oblique contracts, THIS action occurs
intorsion (DO)
extorsion (VO)
This closes the dorsolateral gap of the orbital margin
what is ...the orbital ligament
What covers the sclera of the eye?
Bulbar Conjunctiva
What are the layers of the wall of the bulbus oculi? (i.e. if a pin is through it what layer would the pin go through)
External fibrous coat-- middle vascular coat-- internal "nervous coat"
What chamber is posterior to the lens and contains vitreous body?
Vitreous chamber
What is the external ear called and what does it contain
auricle (pinna)-- marginal cutaneous sac and tragus
This is the sheath of connective tissue and smooth muscle that encloses the orbital contents
Periorbita
What is the angle that is formed between palpebral and bulbar conjunctiva??
Fornix (good picture on slide 11)
What makes up the external fibrous coat?
cornea (transparent, anterior portion), sclera (opaque, posterior portion), and limbus (corneoscleral junction)
this is also where the extrinsic ocular muscles insert (e.f.c.)
What is the pathway for light (7 steps)
cornea--- anterior chamber--- pupil--- posterior chamber--- lens--- vitreous chamber---fundus
What is in the middle ear?
tympanic membrane, tympanic cavity, and a medial wall with petrous temporal bone (vestibular window is oval and cochlear window is round)
In the canine orbit and pterygopalatine fossa, THIS gland and THIS nerve are easily visible before observing eye muscles (typically under a cut portion of the coronoid process of mandible)-sorry would be a better questions if I could add pictures---
What is... the lacrimal gland and the maxillary nerve (slide 8)
This isn't a 500 question but what is the potential cavity formed when the eye is closed?
Conjunctival sac
What makes up the middle vascular coat (uvea)??
Choroid (has tapetum lucidum), ciliary body (produces aqueous humor), and iris (most anterior)
What is the pathway for aqueous humor production and resorption?? (6 steps)
ciliary body--- posterior chamber--- pupil--- anterior chamber--- iridocorneal chamber--- scleral venous plexus
What is ventral to both windows of the middle ear (medial wall) and bulges over the cochlea
promontory
some more on the middle ear and inner ear left on slides that are not on this jeopardy (3-4 slides)