Agonist, Synergist, Antagonist and Yoke muscle of Eye | Cardinal direction of gaze

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Agonist: The primary muscle that moves an eye in a given direction is known as the agonist
Antagonist: Muscle in the same eye that moves the eye in the opposite direction of the agonist
Agonist- Antagonist Pairs: muscles of the same eye having the opposite actions
Synergists: A muscle in the same eye that moves the eye in the same direction as the agonist is known as the synergist
Yoke Muscles: muscles in each eye that accomplish a given version (contralateral synergists)

1. Dextroversion: When both eyes are turned to the right. It is affected
by a simultaneous contraction of right lateral and left medial rectus
muscle.

2. Levoversion: When both eyes are turned towards left by contraction
of left lateral and right medial rectus.

3. Supraversion: when both eyes are rotated straight up. It is affected
by a simultaneous contraction of superior rectus and inferior oblique
of both eyes.

4. Infraversion: When both eyes are turned straight down, and is
caused by a bilateral contraction of inferior rectus and superior
oblique muscles.

5. Dextrodepression: When both eyes are turned down and to the
right. It is caused by a simultaneous contraction of right inferior
rectus and left superior oblique.

6. Dextroelevation: When both eyes are tured up and to the right. It
is caused by a simultaneous contraction of right superior rectus and
left inferior oblique.

7. Levoelevation: When both eyes are turned up and to the left , a
position achieved by a simultaneous contraction of left superior
rectus and right inferior oblique.

8. Levodepression: When both eyes are turned down and to the left .
This position is brought about by a simultaneous contraction of left
inferior rectus and right superior oblique.

9. Dextrocycloversion: When the eyes rotate along the anterioposterior
axis so that the superior pole (12 O’clock point) rotates to the right
side. This movement is brought about a simultaneous contraction
of inferior rectus and inferior oblique muscle of the right eye, and
superior rectus and the superior oblique of left eye.

10. Levocycloversion: A movement just opposite of dextrocycloversion.

Chapters
00:00 Starts
00:13 Intro
00:27 Agonist
01:20 Synergist
02:32 Antagonist
03:05 Yoke muscle
04:37 End

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[thandiwezawe]

Wow nice interpretation, well understood ❤

[meitavelo]

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