Orbit Flashcards
Base
Orbital Margins
Apex
Optic Canal
Superior Wall
Frontal, Lesser wing of sphenoid
Lateral Wall
Zygomatic, Greater wing of sphenoid
Medial Wall
Frontal, Lesser wing sphenoid, ethmoid, lacrimal
Inferior Wall
Maxilla, Zygomatic, Palatine
Conjunctiva
Transparent Mucous membrane
Palpebral
Eyelid
Bulbar
???
Tarsal Plates
Dense bands of CT, structure of eyelids
Tarsal Glands
Lipid secreting glands embedded in tarsal plates
Keep edges of eyelids from sticking together
Ciliary Glands
Sebaceous glands associated with eyelashes
Inflammation –> Sty
Orbital
Periorbita and meninges Eyeball Lacrimal Apparatus Musculature Innervation Vasculature
Lacrimal Apparatus
Lacrimal Gland (CN 7) Lacrimal Ducts Canaliculus (in puncta) Lacrimal Sac Nasolacrimal Duct
Levator Palpebrae Superioris
CN 3
Superior tarsal muscle of Muller (symp innervation)
Superior Oblique
CN 4
Uses trochlea as sling to insert onto posterosuperior surface of sclera, below superior rectus
Inferior Oblique
CN 3
Only extrinsic muscle to originate from anterior orbit
Muscles run inferior to inferior rectus to insert onto posterinferior surface of sclera
Muscles originating from common tendinous ring and insert onto sclera
Superior Rectus (3) Inferior Rectus (3) Medial Rectus (3) Lateral Rectus (6)
Autonomic Musculature
In iris
Sphincter pupillae = CN 3, para
Dilator pupillae = symp from cervical chain
Nerves
CN 2 - Optic Canal CN 3 - SOF CN 4 - SOF CN 6 - SOF CN V1 - nasociliary, frontal, lacrimal
Vasculature
Ophthalmic artery and vein
Diplopia
???
Internal Strabismus
CN 6
External Strabismus
CN 3
Mydriasis
CN 3 - para innervation
Ptosis
Levator Palpebrae - CN 3
