Orbit 1 Flashcards
Roof of the orbit is ____
horizontal
Roof is mostly formed by?
Orbital part of frontal bone
At the supraorbital margin, supraorbital notch or foramen transmits the ____ ____ of the ____ n.
supraorbital branch of the frontal n
Shallow depression anterolaterally, _____ ____ - for ____ gland
lacrimal fossa - lacrimal
The floor is mainly?
Maxilla
Maxilla contains?
Infraorbital groove
Infraorbital canal
Infraorbital foramen
What structure is paper-thin portion of ethmoid bone that separates the orbit from underlying ethmoid cells?
Lamina Papyracea
Lacrimal groove is located in which wall of the orbit?
Medial wall
The upper and lower eyelids contain a dense connective tissue called?
Tarsal plate
The name of the enclosed potential space of the eyelids is called?
Conjunctival sac
Superior and inferior tarsal plates merge to form?
Medial and lateral palpebral ligaments
Facial sheet that attaches the tarsal plates to the inferior and superior orbital margins?
Orbital septum
Levator palpebrae superioris muscle is innervated by?
Superior division of the oculomotor nerve (CN III)
Paralysis produces ____ or ____, with inability to lift the eyelid.
ptosis or blepharoptosis
Superior tarsal muscle is AKA
**small and seperate portion of the levator palpebral superioris m
Muller’s muscle
Contraction of the Superioris tarsal muscle accentuates the opening of the palpebral fissure as?
Wide-eyed fear
Innervation of the Superioris tarsal muscle?
Sympathetic division of the autonomic nervous system
Lack of muscle tone because of decreased sympathetic activity or decreased circulating levels of EPINEPHRINE results in difficulty keeping eyes open “(____ ____)”.
tired eyes
Lesion of the Superior tarsal muscle?
Causes paralysis of this muscle with a slight drooping of the eyelid called?
Horner’s syndrome
Pseudoptosis
How many layers do the eyelids have?
7
Skin of the eyelids contain what type of glands?
sweat and sebaceous glands
Sebaceous glands associated with eyelashes are known as?
ciliary glands
Obstruction of these glands results in a?
Stye
A ____ is a rather painful condition in which the ducts of these glands become blocked.
Chalazion
Lacrimal ducts drain into the?
Superior fornix
Vasodilation in response to allergy, irritation or inflammation produces?
Bloodshot eye and pinkeye
Bulbar (corneal) conjunctiva is innervated by which CN?
Ophthalmic division of Trigeminal N
Which reflex allows to test afferent portion of CN V and efferent portion of CN VII
Corneal (blink) reflex
Name the triangular area at the medial canthus where the tears collect?
Lacus lacrimalis (L.)
Lacrimal lake is enclosed by?
Plica semilunaris
**In some animals known as the 3rd eyelid
Name of the fleshy elevation seen in the medial angle of the eye within the lacrimal lake.
Lacrimal caruncle
Orfice of the lacrimal apparatus is formed by small lacrimal papilla with an apical?
lacrimal punctum
Preganglionic parasympathetic fibers conveyed from ____ ____ by the ____ ____ ____ and then by the nerve of ____ ____ to the ____ ____.
facial nerve/ greater petrosal nerve/pterygoid canal/pterygopalatine ganglion
Postganglionic parasympathetic fibers travel with ____ n (from ____ n of __) to the lacrimal branch of the ____ n __.
zygomaticotemporal n (from maxillary nerve V2)/ ophthalmic nerve VI
Are there any synapses in the geniculate ganglion?
NO
Greater petrosal n =
Preganglionic Parasympathetic (VII)
Deep petrosal n =
PostG Symp (TI)
Lesser petrosal n =
PregPara (IX)
Postganglionic sympathetics fibers travel with ____ ____ ____ and ____ ____ n; join the parasympathetic fibers to form the ____ of ____ ____ and traverse the nerve ____ ____ (without synapsing).
internal carotid plexus and deep petrosal nerve; nerve of pterygoid canal; ptheygopalatine ganglion
Miosis =
Dilator pupillae*
chronic constricted pupil
Anhydrosis =
not able to sweat on affected side
Red/Flushed due to?
Chronic vasodilation
