(E4) 5 - The Orbit Flashcards
Fisher
Contents of the Orbit (7)
What is the periorbita?
- Periosteum of orbit
- Forms fascial sheath of eyeball
What is this?
Lacrimal glands
What is this?
Lacrimal sac
What is this?
Nasolacrimal duct
What makes up the lacrimal apparatus?
- Lacrimal glands
- Lacrimal sac
- Nasolacrimal duct
Innervation of Lacrimal Gland - Describe the parasympathetics functions & (preganglionic and postganglionic)
Innervation of Lacrimal Gland - Describe the sympathetic functions & postganglionic
What is this?
Iris
Describe the structure of the iris (2 muscles and function)
- Sphincter pupillae m.
- Dilator pupillae m. (Regulate amount of
light entering eye)
What is the pupil?
What is this?
Lens
What is the function of the zonular fibers?
Anchor lens to the ciliary body
What is the function of the lens?
Fine-tunes focus of near or distant objects
on the retina
What is this?
Ciliary body
What are the contents of the ciliary body? (muscle)
Ciliary Muscle
What is this?
Ciliary Muscle
Relaxed or Contracted?
The ciliary muscle is relaxed
Relaxed or Contracted?
The ciliary muscle is contracted
What muscle is this?
Levator Palpebrae Superioris
What muscle makes up the smooth muscle in the distal portion of the levator palpebrae superioris?
Superior Tarsal m.
What muscle is this?
Superior Rectus Muscle
What muscle is this?
Superior Oblique Muscle
What muscle is this?
Lateral Rectus
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
