Eyes Flashcards
4 parts of conjunctiva
- Palpebral conjunctiva
- Bulbar conjunctiva
- Fornix
- Conjunctival sac
Bulbar conjunctiva covers?
Sclera
Conjunctival sac
Potential cavity formed when eye is closed
Plica semilunaris
Fold of palpebral conjunctiva and cartilage protruding from medial angle of eye
Eyelids are called?
Superior and inferior palpebrae
Where eyelids meet is called?
Medial and lateral commissures (or canthi)
Lacrimal gland produces ___% of tears.
Gland of 3rd eyelid produces ___%
Lacrimal - 70%
Gland of 3rd eyelid - 30%
Ocular adnexa
Things attached to eye
Boundaries of orbit
Medial: frontal, presphenoid and lacrimal bb.
Ventral: zygomatic sg. and pterygoid mm.
Caudodorsal: temporal m.
Orbital margin
Osseous margin formed by frontal, larimal and zygomatic bb. + orbital lig.
Periorbita
Sheath of CT and smooth m. which encloses orbital contents
Lacrimal gland drains into?
- Conjunctival sac
- Superior and inferior lacrimal puncta
- Lacrimal canaliculi
- Lacrimal sac
- Nasolacrimal duct
- Nasal vestibule
Parts of external fibrous coat
- Cornea
- Sclera
- Limbus
External fibrous coat is the insertion for?
Extrinsic ocular mm.
Parts of uvea
- Choroid
- Ciliary body
- Iris
Choroid
Posterior portion of uvea lining internal surface of sclera including tapetum lucidum
Ciliary body is?
Thickened mound at limbus
Ciliary body produces?
Aqueous humor
Contraction of ciliar m. causes?
Relaxed zonular fibers → lens becomes more spherical (near vision)
Aqueous humor production and resorption
- Ciliary body →
- Posterior chamber →
- Pupil →
- Anterior chamber →
- Iridocorneal angle →
- Scleral venous plexus
Internal nervous coat is?
Retina
Vitreous chamber
Posterior to lens, filled with vitreous-body
Aqueous humor is containd in?
Posterior and anterior chambers
Trochlear n. innervates?
Dorsal oblique m.
Abducent n. innervates?
Lateral rectus m.
Most mm. of eye are innervated by?
Occulomotor n.
