Anatomy Flashcards
1-53 Anatomy of Orbital Contents 54-90 Visual Pathway 91-156 Structure of Eyeball 157-241 The Limbic System and Hypothalamus 242-318 Anatomy of the Thalamus 319-349 Anatomy of the Basal Ganglia 350-396 Meninges and Ventricle of the Brain 397-466 Anatomy of the Cerebellum 467-519 Blood Supply of the Brain 520-617 Organization of Cerebrum I
What bones contribute in forming the orbital margin?
Frontal
Maxillary
Zygomatic
What structures make up the roof of the orbital cavity?
Frontal bone
Lesser wing of sphenoid bone
What structures make up the lateral walls of the orbital cavity?
Zygomatic bone
Greater wing of sphenoid bone
What structures make up the medial wall of the orbital cavity?
Frontal process of maxilla
Lacrimal bone
Orbital plate of ethmoid bone
What structures make up the floor of the orbital cavity?
Zygomatic bone
Maxillary bone
Palatine bone
Where is the supraorbital notch found?
On the frontal bone, on the roof of orbital cavity
What is the superior orbital fissure?
Bony aperture that allows communication between cavernous sinus and the apex of the orbit
What structures pass through the Superior orbital fissure?
CN III [oculomotor nerve]
CN IV [trochlear nerve]
CN V [trigeminal nerve]
CN VI [abducens nerve]
Superior ophthalmic vein
What foramen is found on the medial wall?
Anterior ethmoidal foramina
Posterior ethmoidal foramina
Lacrimal groove
What foramen is found on the floor of the orbital cavity?
Infraorbital groove
Infraorbital foramen
Inferior Orbital fissure
What structures form the fibrous skeleton of the eyelid?
Tarsal plate
Orbital septum
Canthus medial ligament
Canthus lateral ligament
Describe the structure of the periorbital fascia
Posteriorly continuous with periosteum lining the interior of the skull / endosteal layer of the dura mater
Anteriorly continuous with periosteum covering external surface of skull
What is bulbar conjunctiva?
Thin, moist transparent membrane covering the cornea
Describe the structure of the bulbar conjunctiva
Reflects posterior surface of eyelid, forming palperbra conjunctiva
What does the palperbra conjunctiva form?
Superior and inferior fornices
What covers the inner surface of the eyelids?
Palpebral conjunctiva
What structure reinforces the eyelid
orbicularis oculi
What structures make up the lacrimal apparatus?
Lacrimal punctum
Lacrimal canaliculus
Lacrimal sac
Nasolacrimal duct
Inferior nasal meatus
What is the origin of the levator palpebra superioris?
Lesser wing of sphenoid bone
What is the insertion of the levator palpebra superioris?
Skin of upper eyelid
What is the innervation of the levator palpebra superioris?
Superior branch of oculomotor nerve
Sympathetic fibers [innervates smooth muscle portion]
What is the origin of Muller’s muscle?
Superior tarsal plate
What muscles are implicated in ptosis and why?
Dysfunction of the muscles or their nerve supplies
Levator palpebrae superioris
Muller’s [superior tarsal] muscle
What is the origin of the recti muscles?
Common tendinous ring, at the junction of the superior and inferior orbital fissure



