Ocular A&P- EOMs PP1
As the muscular arteries continue forward, what do they turn into? - ANS-Anterior ciliary
arteries
Do the actin and/or myosin myofibrils shorten during muscle contraction? - ANS-Neither
change length
Does a muscle fiber have one nuclei? - ANS-No, it has many
Does the A band shorten with contraction? - ANS-A band does not shorten
Does the H zone shorten with contraction? - ANS-Yes
Does the I band shorten with contraction? - ANS-Yes.
How does the EOM blood supply compare to other striated muscle? - ANS-More dense
How does the EOM CT sheath compare to other striated muscle? - ANS-More delicate
How does the EOM Elastic fiber concentration compare to other striated muscle? -
ANS-Higher concentration
How does the EOM muscle contraction compare to other striated muscle? - ANS-Weak,
but very fast
How does the EOM neuron:muscle fiber ratio compare to other striated muscle? -
ANS-High, resulting in finer control (fewer fibers per neuron)
How far do the global fibers run in the EOMs? - ANS-Full length of muscle
How far do the orbital fibers run in the EOMs? - ANS-End before muscle becomes
tendon
How is actin arranged? - ANS-In a double helix with troponin and tropomysin on the
outside of the helix
How many EOMs are there per eye? - ANS-6
, What are myotendinous cylinders (palisade endings)? - ANS-Unique proprioceptive
receptors on the EOMs
What are the 2 types of orbital muscle fibers? - ANS--Singly innervated red
-Singly innervated white
What are the 4 types of global muscle fibers? - ANS--Singly innervated red
-Singly innervated intermediate
-Singly innervated white
-Multiply innervated
What are the characteristics of the multiply innervated global fibers? - ANS--Slow tonic
-Very poor fatigue resistance
What are the characteristics of the singly innervated intermediate global fibers? -
ANS--Fast twitch
-Intermediate fatigue resistance
What are the characteristics of the singly innervated red global fibers? - ANS--Fast
twitch
-Very fatigue resistant
What are the characteristics of the singly innervated red orbital fibers? - ANS--Fast
twitch
-Fatigue resistant.
What are the characteristics of the singly innervated white global fibers? - ANS--Fast
twitch
-Low fatigue resistance
What are the characteristics of the singly innervated white orbital fibers? - ANS--Mixed
fast twitch and slow tonic
-Moderate fatigue resistance
What are the extrinsic muscles of the eye? - ANS--Rectus muscles (4)
-Oblique muscles (2)
What are the horizontal rectus muscles? - ANS-MR
LR
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