ANATOMIC RELATIONSHIPS orbital structures Flashcards
Whats a single bone found in the middle portion which forms the base of the cranium?
Sphenoid
Sphenoid bone is where you would find?
optic canal
What is sella trucica?
this is a depression in the body of the sphenoid bone that contains the pituitary gland
Whats the importance of pituitary gland?
if there is a damage to the pitutitary gland, it will damage the nasal fibers from each eye, therefore you will have BITEMPORAL HEMINOPSIA VISUAL FIELD DEFECT
Where is optic chiasm situaated?
lies superior to the pituitary gland
What are the 2 parts of the sphenoid?
lesser wing
Greater wing
What connects with the lesser wing?
Frontal bone
What 2 bones make up the roof of the orbit?
Lesser wing and frontal bone
What makes up the greater wing?
connects with zygomatic bone
What makes up the lateral wall of the orbit?
Greater wing and zygomatic bone
Where is optic canal located?
within the lesser wing
What is the function of the optic canal?
allows passage of the optic nerve and ophthalmic artery
What are the 3 foramina are located in the greater wing of sphenoid?
Foramen rotundum
Foramen ovale
Foramen spinosum
Foramen rotundum allows what nerves?
It transmits maxillary division (V2) of trigeminal
Foramen ovale allows what nerves to pass through?
Mandibular division (V3) Lesser superficial petrosal nerve
Foramen spinosum allows what nerves to pass through?
Middle meningeal artery
What is the gap that is found between lesser and greater wing?
Superior orbital fissure (SOF)
Where is SOF located?
Located between posterior lateral wall and superior wall
Where are the cavernous sinus found?
Just posterior to the SOF
What is cavernous sinus?
they are the large venous channel that travels on each side of the body of the sphenoid
What is Common tendious ring?
This is a circular band of connecting tissue that found anterior to the superior orbital fissure
What muscles are found here?
Origin for the recti muscles
also known as annulus of zinn
what nerves passes through SOF and CTR?
NOA
Nasociliary
Oculomotor
Abducences
Which nerves/vessels passes through SOF but above the CTR?
Superior ophthalmic vein
Frontal nerve
Lacrimal Nerve
Trochlear nerve
What passes thorugh inferior orbital fissure and inferior to the CTR?
Inferior ophthalmic vein
Optic canal have?
Optic nerve and ophthalmic artery
What passes through carotid canal?
internal carotid arery and sympathetic plexus
what passes thorugh Supraorbital foramen
Supraorbital nerve (part VI) and vessels
What passes through infraorbital formane?
Infraorbital nerve (part V2) and vessels
what passes through mandibular foramen?
Inferior alevolar nerve and vessel
What passes through stylomastoid formn?
facial nerve
What makes up the orbital floor and prone to most fractures?
maxillary
palatine
zygomatic
“my pal gets his z’s on the floor”
