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EOMs (1)
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- NUR 240 EXAM 2 Practice Questions.
Exam of 9 pages for the course NUR 240 EXAM 2 Practice Questions. at NUR 240 EXAM 2 Practice Questions. (EOMs (1))
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EOMsActions & Test of the Inferior Oblique? - ANS-Extorsion
Elevation and Abduction
CN3
Test: Look medially and up
Actions & Test of the Inferior Rectus? - ANS-Depression
Extortion and Adduction
CN3
Test: look laterally and down
Actions & Test of the Lateral rectus? - ANS-Abduction
CN6
Test: Look laterally
Actions & Test of the Medial Rectus? - ANS-Adduction
CN3
Test: Look medially
Actions & Test of the Superior Oblique? - ANS-Intorsion
Depression and Abduction
CN4
Test: look medially and down
Actions & Test of the Superior Rectus? - ANS-Elevation
Intorsion and Adduction
CN3
Test: look laterally and up
Actions of right IO and left SR are tested in? - ANS-Up and to the Left
Are most EOM fibers thick or thin? - ANS-Thick
-singly innervated
-en plaque endplate
-fast-twitch and slow-twitch fibers
Duction rotation along the saggital (Y) axis? - ANS-Inwards/Intorsion/Clockwise and
Outwards/Extorsion/Counterclockwise
, Duction rotation along the transverse (X) axis? - ANS-Elevation and Depression
Duction rotation along the vertical (Z) axis? - ANS-Abduction and Adduction
EOM Blood Supply - ANS-Mainly branches from the ophthalmic artery
-Lateral & Medial muscular trunk of ophthalmic artery
Small contribution from infraorbital (maxillary) artery
EOM Histological Features - ANS--Abundant fast-twitch fibers for saccadic movements
- Fatigue-resistant fibers to sustained contraction during gaze fixation and vergence
movements
-Presence of finely-tuned "tonic" fibers for slow contraction during smooth pursuit
movements
-Actions modulated by the surrounding connective tissue
-Precise movements (maintain foveal fixation)
EOM Pulley Hypothesis Facts - ANS-Closely connected to Tenon's capsule
Dense connective tissue and smooth muscle
Form and interconnecting pulley ring and a series of slings
Extraocular muscles of the Orbit? - ANS-MR, LR, SR, IR, SO, IO
Levator palpebrae superioris
Tarsal Muscles of Muller
Facts about Thin muscle fibers? - ANS-Multiple innervated
Grape-like endplate
Slow-twitch and / or slow-tonic fibers
Present only in EOMs
More abundant in orbital layer
Fascial sheath (Tenon's Capsule) - ANS-Condensation of fibrous tissue that covers the
eyeball from the entrance of the optic nerve to the region near the corneal limbus
Acts as a socket for a prosthetic eye
How are ductions explained? - ANS-(movement of one eye)
Along the 3 axes of Fick
-Transverse (X), Vertical (Z), or Sagittal (Y)
How are EOMs controlled? - ANS-(Not fully understood)
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