A3 Flashcards
What makes up the lateral, medial, superior and inferior walls of the orbit?
Superior: lesser wing of sphenoid and frontal bone
Inferior: palatine, maxillary and zygomatic bones
Medial: lacrimal, sphenoid body, ethmoid and maxilla
Lateral: frontal bone, greater wing of the sphenoid, and zygomatic bone
What shape is the orbit?
Pyramidal
What are the fissures and foramina of the orbit?
Superior and Inferior orbital fissure
Optic canal
Supra/infraorbital foramina
Lacrimal groove and nasolacrimal canal
What is the name of the periosteum that lines the orbit?
Periorbita
What is enopthalmos?
Retraction of the eyeball into the orbit due to disease, dehydration and starvation
What are the two layers that cover the eye and eyelids?
Bulbar and palpebral conjunctiva
Which muscle elevates the eyelids?
legatos Palpebrae Superioris
What makes up the layers of the eyeball?
Outer: sclera and cornea
Middle: choroid, ciliary body and iris
Inner: retina
What are the two compartments of the eyeball?
Vitreous chamber posteriorly
Aqueous chamber anteriorly
What is the flow of lacrimal fluid?
Lacrimal gland > excretory ducts > superior conjunctival sac > covers cornea as you blink > drains into lacrimal punctuation and sac into lacrimal canaliculi > nasolacrimal duct into inferior nasal meatus
Lacrimal gland is innervated by facial nerve
What is the blood supply to the eye?
Ophthalmic artery from ICA
Superior and inferior ophthalmic vein into the cavernous sinus
What are the walls of the nasal cavity?
Roof: body of sphenoid, cribiform plate of ethmoid, frontal bone and nasal bone
Medial: perpendicular plate of ethmoid, medial Pterygoid plate of sphenoid and vomer
Lateral: ethmoid, lacrimal, inferior nasal conchae, palatine and maxilla
Floor: palatine bone and maxilla Pauline process
What lines up the nasal cavity?
Pseudostratified ciliated columnar epithelium w/ globet cells
What is the function of sinuses?
Make skull lighter and assist in resonating of voice
Where do each sinus drain?
Frontal, maxillary, and anterior and middle ethmoidal drain into middle meatus
Sphenoid into sphenoethmoidal recess
Nasolacrimal duct into inferior meatus
