EOMS

lateral rectus attachments
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Terms in this set (26)
lateral rectus attachments
upper and lower limb of ring
to prominence on greater wing of sphenoid -> spina recti lateralis
superior rectus course forward beneath
levator muscle
superior rectus sheaths enclosing levator and superior rectus are connected, what is the function
connect eyelid with eye movement (UL elevates on upgaze)
inferior rectus courses forward above
inferior oblique
sheaths enclosing inferior rectus + inferior oblique form ____________
+what is the function
capsulopalpebral fascia

LL loweers on downgaze and elevates on upgaze
which form 23 angle with visual axis upon insertion
inferior rectus
superior rectus
which insert parallel to sagittal axis
medial rectus
lateral rectus
recti muscles become ________ prior to insertion

what covers muscles for short distance?
recti muscles become TENDONS prior to insertion

what covers muscles for short distance? TENONs

penetrate tenons to attach to sclera
tenon's covers for a short distance
Spiral of Tillaux
The insertion pattern of the rectus muscles
most anterior to posterior muscle insertions forming spiral
anterior: medial rectus -> inferior rectus -> lateral rectus -> superior rectus (most posterior)
muscle cone = cone at orbital apex formed byrecti muscles + SOsuperior oblique origin functional origin insertionorigin: lesser wing of sphenoid bone just above optic canal of orbital apex functional origin: trochlea insertion: lateral posterosuperior aspect of globe, 55 anglesuperior oblique coursebecome tendon near superior medial orbital wall pass through tochlea (in frontal bone , U shaped) - functional origin courses posterolaterally beneath superior rectusinfeior oblique origin insertionorigin: maxillary bone (posterior to inferior medial orbital rin) insertion: lateral posteroinferior aspect of globe (51 angle)only EOM to have origin in anterior orbitinferior obliquecourses the inferomedial wall of the orbit to the posterolateral aspect of the globeinferior oblique musclethe position of gaze when an individual muscle becomes primary mover of eyefield of actionsupraduction infraductionSupra: Upward movement Infra: Downward movementincyloduction/intorsion exycloduction/exrosionincyloduction/intorsion: inward exycloduction/extorsion: outwardadduction abductionadduction: midline/nasal abduction: away from midlineif course of muscle parallel to axisno rotation around axisif course of muscle is perpendicular to axis, only rotation isaround the axisprinciple muscle involved in actionagonistsherrington's law of reciprocal innervationwhen agonist muscle contracts (stimulated), antagonist relaxes (inhibited)muscle that works in concert with another muscle to generate a movementsynergistmotor innervation EOMSLR6SO4