Intramuscular & Extraocular Muscles Quiz

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| By Talia Tunstill
Talia Tunstill, optometry
Talia is a residency-trained optometric glaucoma specialist with over 3 years of clinical experience. She excels in ocular disease management, contact lenses, and peri-operative care, demonstrating a strong commitment to eye health and patient well-being.
Quizzes Created: 2 | Total Attempts: 13,422
Questions: 32 | Attempts: 2,972

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Intramuscular & Extraocular Muscles Quiz - Quiz

Take this quiz and learn more about the extra ocular muscles and their innervation in a patient who periodically.


Questions and Answers
  • 1. 

    Which of the following are intraocular muscles? (pick 2)

    • A.

      Ciliary muscle

    • B.

      Pupil

    • C.

      Iris

    • D.

      Tarsal muscle

    Correct Answer(s)
    A. Ciliary muscle
    C. Iris
    Explanation
    The ciliary muscle and iris are both intraocular muscles. The ciliary muscle is responsible for controlling the shape of the lens, which allows the eye to focus on objects at different distances. The iris, on the other hand, controls the size of the pupil, regulating the amount of light that enters the eye. Both of these muscles are located within the eye itself and play important roles in vision. The tarsal muscle, on the other hand, is not an intraocular muscle, as it is located in the eyelid and is involved in blinking and opening/closing the eye.

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  • 2. 

    Which of the following are Extraocular muscles?

    • A.

      Two Oblique Muscles

    • B.

      Ciliary Muscle

    • C.

      Four Rectus Muscles

    • D.

      Levator palpebrae superioris

    • E.

      Muller's muscle

    • F.

      One Oblique muscle

    Correct Answer(s)
    A. Two Oblique Muscles
    C. Four Rectus Muscles
    D. Levator palpebrae superioris
    E. Muller's muscle
    Explanation
    Extraocular muscles:
     MR, LR, SR, IR, SO, IO
     Levator palpebrae superioris
     Tarsal muscles (or Müller’s muscle)

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  • 3. 

    Which EOMs depress the eye? (Select 2 answers) 

    • A.

      IO

    • B.

      IR

    • C.

      LR

    • D.

      MR

    • E.

      SO

    • F.

      SR

    Correct Answer(s)
    B. IR
    E. SO
    Explanation
    Clicker

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  • 4. 

    Which EOM is the main extortor? 

    • A.

      IO

    • B.

      IR

    • C.

      LR

    • D.

      MR

    • E.

      SO

    • F.

      SR

    Correct Answer
    A. IO
    Explanation
    clicker

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  • 5. 

    Which EOMs abduct the eye? (Select 3 answers)

    • A.

      IO

    • B.

      IR

    • C.

      LR

    • D.

      MR

    • E.

      SO

    • F.

      SR

    Correct Answer(s)
    A. IO
    C. LR
    E. SO
    Explanation
    Clicker

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  • 6. 

    Which EOMs depress the eye from an adducted position?

    • A.

      IO

    • B.

      IR

    • C.

      LR

    • D.

      MR

    • E.

      SO

    • F.

      SR

    Correct Answer
    E. SO
    Explanation
    Clicker

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  • 7. 

    Actions of right IO and left SR are tested in?

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    B. B
    Explanation
    Clicker

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  • 8. 

    Which of the following describes the primary gaze? (Pick 2)

    • A.

      The superior (and inferior)oblique forms a 54 degree angle with the visual axis

    • B.

      The superior (and inferior)oblique forms a 23 degree angle with the visual axis

    • C.

      The superior (and inferior) rectus forms a 23 degree angle with the visual axis

    • D.

      The superior (and inferior) rectus forms a 54 degree angle with the visual axis

    Correct Answer(s)
    A. The superior (and inferior)oblique forms a 54 degree angle with the visual axis
    C. The superior (and inferior) rectus forms a 23 degree angle with the visual axis
    Explanation
    The primary gaze is described by the superior (and inferior) oblique forming a 54 degree angle with the visual axis and the superior (and inferior) rectus forming a 23 degree angle with the visual axis.

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  • 9. 

    If the eye is adducted the superior oblique is the only EOM that depresses the eye

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    When the eye is adducted, it means that it is turned inward towards the nose. The superior oblique muscle is responsible for depressing or moving the eye downward. In this position, the other extraocular muscles (EOMs) that control eye movement do not contribute to the downward movement of the eye. Therefore, it can be concluded that if the eye is adducted, the superior oblique is the only EOM that depresses the eye.

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  • 10. 

    When the eye is adducted about 67 degrees what is the only action of the vertical recti EOMs (SR and IR)

    • A.

      Torsion

    • B.

      Elevation

    • C.

      Depression

    • D.

      There is more than one action

    Correct Answer
    A. Torsion
    Explanation
    When the eye is adducted about 67 degrees, the only action of the vertical recti EOMs (SR and IR) is torsion. Torsion refers to the rotation of the eye around its visual axis. In this case, the vertical recti muscles are responsible for rotating the eye inwards or outwards, causing torsional movement. The other actions mentioned, such as elevation and depression, are not applicable in this specific scenario.

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  • 11. 

    What Muscles are involved?

    • A.

      RSR

    • B.

      LIO

    • C.

      RIO

    • D.

      LSR+LIO

    • E.

      RSR+RIO

    • F.

      LSO

    • G.

      LMR

    • H.

      LSR

    Correct Answer(s)
    A. RSR
    B. LIO
    Explanation
    The correct answer is RSR, LIO. This means that the muscles involved in the given situation are the Right Superior Rectus (RSR) and the Left Inferior Oblique (LIO).

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  • 12. 

    What Muscles are involved?

    • A.

      RSR

    • B.

      LIO

    • C.

      RIO

    • D.

      LSR+LIO

    • E.

      RSR+RIO

    • F.

      LSO

    • G.

      LMR

    • H.

      LSR

    Correct Answer(s)
    D. LSR+LIO
    E. RSR+RIO
    Explanation
    The correct answer is LSR+LIO, RSR+RIO. This answer suggests that multiple muscles are involved in the given scenario. The LSR (Lateral Sphincter of the Rectum) and LIO (Internal Anal Sphincter) muscles are involved on the left side, while the RSR (Right Sphincter of the Rectum) and RIO (Internal Anal Sphincter) muscles are involved on the right side. This combination of muscles working together helps in various functions related to the rectum and anal sphincter control.

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  • 13. 

    What Muscles are involved? 

    • A.

      RSR

    • B.

      LIO

    • C.

      RIO

    • D.

      LSR+LIO

    • E.

      RSR+RIO

    • F.

      LSO

    • G.

      LMR

    • H.

      LSR

    Correct Answer(s)
    C. RIO
    H. LSR
    Explanation
    The muscles involved in this question are the Right Infraspinatus (RIO) and the Left Supraspinatus (LSR).

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  • 14. 

    What Muscles are involved?

    • A.

      RSR

    • B.

      LIO

    • C.

      RIO

    • D.

      LSR+LIO

    • E.

      RSR+RIO

    • F.

      LSO

    • G.

      LMR

    • H.

      LSR

    • I.

      RLR

    • J.

      RMR

    • K.

      LLR

    Correct Answer(s)
    G. LMR
    I. RLR
    Explanation
    The correct answer is LMR, RLR.

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  • 15. 

    What Muscles are involved?

    • A.

      RSR

    • B.

      LIO

    • C.

      RIO

    • D.

      LSR+LIO

    • E.

      RSR+RIO

    • F.

      LSO

    • G.

      LMR

    • H.

      LSR

    • I.

      RLR

    • J.

      RMR

    • K.

      LLR

    Correct Answer(s)
    J. RMR
    K. LLR
  • 16. 

    What Muscles are involved?

    • A.

      RSR

    • B.

      LIO

    • C.

      RIO

    • D.

      LSR+LIO

    • E.

      RSR+RIO

    • F.

      LSO

    • G.

      LMR

    • H.

      LSR

    • I.

      RLR

    • J.

      RIR

    • K.

      LLR

    Correct Answer(s)
    F. LSO
    J. RIR
    Explanation
    The muscles involved in this question are the Left Serratus Anterior (LSO) and the Right Internal Rotators (RIR).

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  • 17. 

    Which muscles are used? (Pick 2)

    • A.

      RIR+RSO

    • B.

      LIR+LSO

    • C.

      RSO

    • D.

      LSO

    • E.

      LIR

    • F.

      RIR

    • G.

      LMR

    • H.

      RMR

    Correct Answer(s)
    A. RIR+RSO
    B. LIR+LSO
    Explanation
    The correct answer is RIR+RSO and LIR+LSO. These muscle combinations indicate the use of the Right Internal Rotators (RIR) and Right Superior Oblique (RSO) muscles, as well as the Left Internal Rotators (LIR) and Left Superior Oblique (LSO) muscles. These muscles are likely being used in some kind of physical activity or exercise.

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  • 18. 

    Which muscles are used? (Pick 2)

    • A.

      RIR+RSO

    • B.

      LIR+LSO

    • C.

      RSO

    • D.

      LSO

    • E.

      LIR

    • F.

      RIR

    • G.

      LMR

    • H.

      RMR

    Correct Answer(s)
    C. RSO
    E. LIR
    Explanation
    The muscles used in this scenario are the Right Superior Oblique (RSO) and the Left Inferior Rectus (LIR).

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  • 19. 

    What applies to the medial rectus?

    • A.

      Adduction

    • B.

      CN III

    • C.

      CN VI

    • D.

      Elevation

    • E.

      Abduction

    • F.

      Depression

    • G.

      Extosion

    • H.

      Intorsion

    Correct Answer(s)
    A. Adduction
    B. CN III
    Explanation
    The medial rectus muscle is responsible for adduction, which is the movement of the eye towards the midline. CN III, also known as the oculomotor nerve, innervates the medial rectus muscle and controls its movement. This nerve supplies motor fibers to the muscle, allowing it to contract and move the eye medially.

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  • 20. 

    What applies to the lateral rectus?

    • A.

      Adduction

    • B.

      CN III

    • C.

      CN VI

    • D.

      Elevation

    • E.

      Abduction

    • F.

      Depression

    • G.

      Extosion

    • H.

      Intorsion

    Correct Answer(s)
    C. CN VI
    E. Abduction
    Explanation
    The correct answer is CN VI, Abduction. The lateral rectus muscle is responsible for the movement of the eye called abduction, which is the movement of the eye away from the midline of the body. CN VI, also known as the abducens nerve, innervates the lateral rectus muscle and controls its contraction. This allows the eye to move laterally, away from the nose.

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  • 21. 

    What applies to the superior rectus?

    • A.

      Adduction

    • B.

      CN III

    • C.

      CN VI

    • D.

      Elevation

    • E.

      Abduction

    • F.

      Depression

    • G.

      Extosion

    • H.

      Intorsion

    Correct Answer(s)
    A. Adduction
    B. CN III
    D. Elevation
    H. Intorsion
    Explanation
    The superior rectus muscle is responsible for elevation, adduction, and intorsion of the eye. It is innervated by the oculomotor nerve (CN III). Adduction refers to the movement of the eye towards the midline, elevation refers to the upward movement of the eye, and intorsion refers to the inward rotation of the eye. Therefore, all of the given options apply to the superior rectus muscle.

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  • 22. 

    What applies to the inferior rectus?

    • A.

      Adduction

    • B.

      CN III

    • C.

      CN VI

    • D.

      Elevation

    • E.

      Abduction

    • F.

      Depression

    • G.

      Extosion

    • H.

      Intorsion

    Correct Answer(s)
    A. Adduction
    B. CN III
    F. Depression
    G. Extosion
    Explanation
    The inferior rectus muscle is responsible for certain movements of the eye. It is involved in adduction, which refers to the movement of the eye towards the midline. It is innervated by cranial nerve III (CN III), also known as the oculomotor nerve, which controls the movement of several eye muscles. The muscle also contributes to depression, which is the downward movement of the eye. However, extorsion, which refers to the rotation of the top of the eye away from the midline, is not applicable to the inferior rectus muscle.

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  • 23. 

    What applies to the superior oblique?

    • A.

      Adduction

    • B.

      CN III

    • C.

      CN IV

    • D.

      Elevation

    • E.

      Abduction

    • F.

      Depression

    • G.

      Extosion

    • H.

      Intorsion

    Correct Answer(s)
    C. CN IV
    E. Abduction
    F. Depression
    H. Intorsion
    Explanation
    The superior oblique muscle is innervated by cranial nerve IV, also known as the trochlear nerve. It is responsible for the movements of abduction (moving the eye away from the midline), depression (moving the eye downward), and intorsion (rotating the top of the eye inward). Therefore, the correct answer includes CN IV, abduction, depression, and intorsion.

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  • 24. 

    What applies to the inferior oblique?

    • A.

      Adduction

    • B.

      CN III

    • C.

      CN IV

    • D.

      Elevation

    • E.

      Abduction

    • F.

      Depression

    • G.

      Extorsion

    • H.

      Intorsion

    Correct Answer(s)
    B. CN III
    D. Elevation
    E. Abduction
    G. Extorsion
    Explanation
    The correct answer is CN III, Elevation, Abduction, and Extorsion. CN III refers to the oculomotor nerve, which innervates the inferior oblique muscle. Elevation refers to the upward movement of the eye, which is one of the actions performed by the inferior oblique. Abduction refers to the outward movement of the eye, another action performed by the inferior oblique. Extorsion refers to the outward rotation of the eye, which is also a function of the inferior oblique muscle.

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  • 25. 

    What is the origin of the 4 recti muscles?

    • A.

      Annulus of Zinn

    • B.

      Sclera

    • C.

      Anterior aspects of bony orbit (medial wall close to the nasolacrimal canal)

    • D.

      None of the above

    Correct Answer
    A. Annulus of Zinn
    Explanation
    The origin of the 4 recti muscles is the annulus of Zinn.

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  • 26. 

    What is the origin of inferior oblique?

    • A.

      Annulus of Zinn

    • B.

      Sclera

    • C.

      Anterior aspects of bony orbit (medial wall close to the nasolacrimal canal)

    • D.

      None of the above

    Correct Answer
    C. Anterior aspects of bony orbit (medial wall close to the nasolacrimal canal)
    Explanation
    The origin of the inferior oblique muscle is the anterior aspects of the bony orbit, specifically the medial wall close to the nasolacrimal canal. The annulus of Zinn and the sclera are not the origins of the inferior oblique muscle.

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  • 27. 

    What is the origin of superior oblique?

    • A.

      Orbital apex (lesser wing of sphenoid)

    • B.

      Sclera

    • C.

      Anterior aspects of bony orbit (medial wall close to the nasolacrimal canal)

    • D.

      None of the above

    Correct Answer
    A. Orbital apex (lesser wing of sphenoid)
    Explanation
    The superior oblique muscle originates from the orbital apex, specifically the lesser wing of the sphenoid bone. This muscle does not originate from the sclera or the anterior aspects of the bony orbit.

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  • 28. 

    All 6 EOMs attach to the iris

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    All 6 EOMS attach to the sclera

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  • 29. 

    What is coordinated binocular movement? (Select all that apply)

    • A.

      Vergences

    • B.

      Gazes

    • C.

      Duction

    • D.

      Versions

    Correct Answer(s)
    A. Vergences
    B. Gazes
    D. Versions
    Explanation
    Coordinated binocular movement refers to the synchronized movement of both eyes to maintain binocular vision. Vergences are the inward and outward movements of the eyes to focus on objects at different distances. Gazes are the directed eye movements towards specific targets. Versions are the coordinated movements of both eyes in the same direction. All of these factors contribute to coordinated binocular movement.

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  • 30. 

    What law applies to vergence movements of yoked muscles?

    • A.

      Sherrington's law

    • B.

      Hering's law

    • C.

      Harrington's law

    • D.

      None of the above

    Correct Answer
    B. Hering's law
    Explanation
    Hering's law applies to vergence movements of yoked muscles. This law states that when the eyes converge or diverge to focus on a near or far object, there is an equal and opposite movement of the two eyes. This ensures that the eyes move in a coordinated manner and maintain binocular vision. Sherrington's law refers to the reciprocal innervation of agonist and antagonist muscles, while Harrington's law is not a recognized law in relation to vergence movements.

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  • 31. 

    What law applies to vergence movements of yoked muscles?

    • A.

      Sherrington's law

    • B.

      Hering's law

    • C.

      Harrington's law

    • D.

      None of the above

    Correct Answer
    B. Hering's law
    Explanation
    Hering's law applies to vergence movements of yoked muscles. This law states that when both eyes move inward or outward to focus on an object, the muscles controlling the movement of the eyes work in a coordinated manner. The law explains that when the eyes converge (move inward), the medial rectus muscles contract, while the lateral rectus muscles relax. Conversely, when the eyes diverge (move outward), the lateral rectus muscles contract, while the medial rectus muscles relax. This coordination ensures that both eyes are aligned and focused on the same object.

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  • 32. 

    What law applies to Ductions (antagonistic muscles)?

    • A.

      Sherrington's law

    • B.

      Hering's law

    • C.

      Harrington's law

    • D.

      None of the above

    Correct Answer
    A. Sherrington's law
    Explanation
    Sherrington's law applies to Ductions (antagonistic muscles). This law states that when one muscle is activated, its antagonist muscle is inhibited, allowing for smooth and coordinated movement. This law helps to explain how muscles work together to produce controlled and balanced movements.

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 20, 2017
    Quiz Created by
    Talia Tunstill
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