(E4) 5 - The Orbit Flashcards by Alyssa Reynolds

Q

Contents of the Orbit (7)

A

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Q

What is the periorbita?

A

Periosteum of orbit
Forms fascial sheath of eyeball

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Q

What is this?

A

Lacrimal glands

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Q

What is this?

A

Lacrimal sac

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Q

What is this?

A

Nasolacrimal duct

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Q

What makes up the lacrimal apparatus?

A

Lacrimal glands
Lacrimal sac
Nasolacrimal duct

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Q

Innervation of Lacrimal Gland - Describe the parasympathetics functions & (preganglionic and postganglionic)

A

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Q

Innervation of Lacrimal Gland - Describe the sympathetic functions & postganglionic

A

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Q

What is this?

A

Iris

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Q

Describe the structure of the iris (2 muscles and function)

A

Sphincter pupillae m.
Dilator pupillae m. (Regulate amount of
light entering eye)

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Q

What is the pupil?

A

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Q

What is this?

A

Lens

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Q

What is the function of the zonular fibers?

A

Anchor lens to the ciliary body

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Q

What is the function of the lens?

A

Fine-tunes focus of near or distant objects
on the retina

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Q

What is this?

A

Ciliary body

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Q

What are the contents of the ciliary body? (muscle)

A

Ciliary Muscle

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Q

What is this?

A

Ciliary Muscle

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Q

Relaxed or Contracted?

A

The ciliary muscle is relaxed

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Q

Relaxed or Contracted?

A

The ciliary muscle is contracted

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Q

What muscle is this?

A

Levator Palpebrae Superioris

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Q

What muscle makes up the smooth muscle in the distal portion of the levator palpebrae superioris?

A

Superior Tarsal m.

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Q

What muscle is this?

A

Superior Rectus Muscle

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Q

What muscle is this?

A

Superior Oblique Muscle

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Q

What muscle is this?

A

Lateral Rectus

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What muscle is this?

Medial Rectus

What muscle is this?

Inferior Rectus

What muscle is this?

Inferior Oblique

Eye Movements Image

Eye Movements Flow Chart

Function of the Optic Nerve

Where does the optic nerve exit from orbit?

Optic canal

What is the part of the optic n. that lies within the bulb of the eye?

Optic nerve head

Describe the formation of the optic nerve.

Where does the oculomotor nerve enter from?

Enters orbit via superior orbital fissure.

Oculomotor N. - Describe GSE (to what?)

Motor to skeletal m.

Oculomotor N. - Describe GVE (to what?)

Oculomotor N. Superior division supplied to what?

levator palpebrae superioris and superior rectus mm.

Oculomotor N. Inferior division supplied to what?

medial rectus, inferior rectus and inferior oblique mm.; preganglionic parasympathetics to ciliary ganglion

Where do the Trochlear and Abducens nerves enter from?

Enters orbit via superior orbital fissure.

Trochlear Nerve - Fiber type and to what?

Abducens Nerve - Fiber type and to what?

All 3 terminal branches of V1 enter the orbit via ______

superior orbital fissure

Where is the nasociliary nerve found, and what are its 5 branches?

Location of Frontal Nerve and its 2 branches.

Location and function of Lacrimal Nerve

Eye - Where are the parasympathetic preganglionic cell bodies?

Edinger-Westphal nucleus – midbrain

Eye - Where are the parasympathetic postganglionic cell bodies?

Eye - Where are the sympathetic preganglionic cell bodies?

T1 - T3/4

Eye - Where are the sympathetic postganglionic cell bodies?

What is this?

Ciliary Ganglion

What are the 3 contributions to the ciliary ganglion?

Short Ciliary Nerves - Origin and Function

Long Ciliary Nerves - Origin and Function

Image - Autonomics of the Eye

Ophthalmic Artery - Origin and Supply

Central a. of the retina - Origin, Location, and Supply

Lacrimal Artery - Origin, Location, and Supply

Posterior Ciliary Arteries - Origin and Supply

Supraorbital Artery - Origin, Location, and Supply

Supratrochlear Artery - Origin and Exit w/

Anterior and posterior ethmoidal aa. - Origin and function

Describe venous drainage related to the superior/inferior ophthalmic veins.

Describe venous drainage related to the central vein of the retina.

Causes and Results of Orbit Fracture

Possible problems due to a fracture of the orbit

Cause of Horner's Syndrome

Signs of Horner's Syndrome

What is the most common ocular motor paralysis?

Abducens Nerve Palsy

Causes and Results of Abducens Nerve Palsy