Identify the elements of the bony orbit on a skull or x-ray.
Indicate the structures lying superior, inferior, medial and lateral to the eyeball and the position of the eyeball relative to the bony orbit.
Horizontal CT
Orbit lies:
Lateral to nasal cavity and paranasal sinuses
Medial to infratemporal fossa
Coronal CT
Orbit lies:
Inferior to cranial cavity
Above maxillary sinus
Eyeball is oriented anteroposteriorly but orbits are angled outward
Trace the flow of blood into and out of the orbit and orbital structures.
Internal carotid a.
Ophthalmic a.
Lacrimal a.
Post. ethmoidal a.
Ant. ethmoidal a.
Supratrochlear a.
Supra-orbital a.
Lacrimal gland
Facial v.
Sup. Ophthalmic v.
Cavernous sinus
Pterygoid plexus
Inf. Ophthalmic v.
Retromandibular v.
LR
SO
IR
IO
MR
SR
LP
Identify the extra-ocular muscles.
Side view
Frontal views
Levator palpebrae
Superior oblique
Inferior rectus
Superior rectus
Lateral rectus (cut)
Inferior oblique
Medial rectus
Optic nerve
LP
SR
SO
IO
IR
MR
LR
LR
SO
IR
IO
MR
SR
LP
Indicate the nerve supply to each.
V
III
IV
VI
V1
V2
V3
II
Frontal n.
Supratrochlear n.
Supra-orbital n.
Lacrimal n.
Sensory nerves are branches of the ophthalmic division of the trigeminal- V1
V
III
IV
VI
II
VI
Nasociliary n.
Lacrimal n.
Ciliary ganglion
Short ciliary nn.
Ethmoidal nn.
Frontal n. (cut)
Infrat
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