Orbit and Eye Flashcards
label the 7 bones that form the orbit
what passes through the optic foramen?
optic nerve
opthalamic artery
what passes through the superior orbital fissure?
- oculomotor nerve
- trochlear nerve
- abducens nerve
- opthalamic divisions of cranial nerve V
- opthalamic veins
what passes through the inferior orbital fissure?
maxillary division of cranial nerve V
what is the type of view that is shown?
what paranasal air sinuses can you see?
- Water’s view
- frontal, maxillary and ethmoid sinus
what are the main contents of the orbit?
- eyeballs/eyelid
- extrinsic ocular muscles
- ligaments supporting the eye
- cranial nerves (II, III, IV, V, VI)
- branches of opthalamic artery
- lacrimal apparatus
- orbital fat
what are the components of the outer fibrous layer of the eye?
- sclera
- cornea
is a complete layer (extends all the way through)
what are the componentas of the middle vascular layer of the eye?
- choroid
- ciliary body
- iris
is incomplete anteriorly > anterior aperturue (in iris) is called pupil
what is the inner sensory layer of the eye composed of?
- retina
- is present posteriorly but anteriorly it stops short just in fron of the equator of the eye.
what divides the eye into anterior and posterior segments?
the crystalline lens
what is the name given to the watery fluid in the anterior segment of the eye?
aqueous humor
what is the name fiven to the gel in the posterior segment of the eye?
vitreous humor
what part of the eye produces (secretes) aqueous humor?
ciliary body
what are the three intrinsic muscles of the eye called?
- ciliaris
- constrictor pupillae
- dilator pupillae
what is the location of the ciliaris muscle?
scleral spur (within ciliary body)
what is the innervation of the intrinsic eye muscles?
- ciliaris and constrictor pupillae > parasympathetic via cranial nerve III.
- dilator pupillae > sympathetic innervation.
when the top of the eye rotates towards the nose, it is called?
intortion
when the top of the eye rotates away from the nose it is called?
extortion
what is the elevator muscle of the upper eyelid called?
levator palpebrae superioris
what innervates the levator palpebrae superioris (LPS) muscle?
oculomotor nerve
label the extrinsic eye muscles
label the extrinsic eye muscles
what is the action of the medial rectus muscle
adduction
lateral rectus muscle action
abduction
superior rectus action
elevation
adduction
intorsion
inferior rectus action
depression
adduction
extorsion
superior oblique action
depression
intorsion (medial rotation)
abduction
inferior oblique action
elevation
abduction
extorsion
which is the only muscle that does not arise from the posterior aspect of the orbit?
inferior oblique
name the ligaments that prevent over-adduction and over-abduction of the eye
medial and lateral check ligaments
what is the function of the suspensory ligament of the eye?
changes the shape of the lens in the process of the accomodation of the eye
name the branch of the internal carotid artery that supplies the orbit and eye
opthalamic artery
which foramen in the orbit do the opthalamic veins pass through to enter into the cavernous sinus in the cranial cavity?
superior orbital fissure
in which part of the orbit does the lacrimal gland lie?
superolateral
from which cranial nerve does the parasympathetic innervation to the lacrimal gland arise?
greater petrosal nerve (branch of facial nerve)
into which meatus of the nasal cavity does the lacrimal sac drain (via the nasolacrimal duct)?
inferior meatus
