Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
19 Cards in this Set
- Front
- Back
|
What type of muscle are the extraocular muscles?
|
They are striated muscle which has a denser blood supply and a more delicated connective tissue sheath than skeletal muscle.
|
|
|
What is the name of the unique receptor for proprioception to extraocular muscles?
|
Myotendinous Cylinder (Palisade ending)
|
|
|
What is a movement involving just one eye?
|
Ductions:
Adduction Abduction Which are rotation around Fick's Z axis Supraduction Infraduction Which are rotations around Fick's X axis. In contrast Torsional movements are incyclorotation or excycloration and those are around Fick's Y axis. |
|
|
What is the difference b/w vergences and versions?
|
Vergence movements are when the eyes move in opposite left-right directions: Like convergence and divergence: dysjunctive eye movements.
versions are when the eyes move in the same direction. These are termed dextroversion, levoversion, supraversion, and infraversion these are all conjunctive eye movements |
|
|
What is the longest EOM? And which is the shortest?
|
The Superior Oblique has the longest tendon length and the Medial Rectus is the shortest.
|
|
|
What is the name of the area in which the rectus muscles originate?
|
The Annulus of Zinn or common tendinous ring
|
|
|
What two muscles attach to the sheath of the optic nerve?
|
Medial Rectus
Superior Rectus |
|
|
What is the area in the center of the Annulus of Zinn refered to?
|
The oculomotor foramen
|
|
|
What is the spiral of tillaux?
|
It is the line that connects the rectus muscle insertions. The spiral starts at the medial rectus then moves clockwise ending with the superior rectus which is the farthest insertion from the limbus.
|
|
|
What two muscles sheaths unite to contribute to the suspensory ligament of lockwood?
|
The Inferior Rectus and Inferior Oblique Muscles.
|
|
|
What coordinates eye movement with eyelid positioning of the lower lid in downward gaze?
|
The capsulopalpebral fascia which is an extension of the inferior rectus sheath along with the suspensory ligament of lockwood connects inserts into the inferior edge of the tarsal plate.
|
|
|
Where is the origin of the Superior Oblique muscle?
|
The lesser wing of the sphenoid bone.
|
|
|
Where is the insertion of ther Superior Oblique muscle?
|
The muscle passes through the trochlea which is a U shaped piece of cartilage attached to the orbital part of the frontal bone and inserts 1 cm posterior to the trochlea.
|
|
|
What is the origin of the Inferior Oblique muscle?
|
The origin is on the maxillary bone. It is the only EOM to have origin in the anterior orbit.
|
|
|
What ligaments limit the movement of the globe?
|
The Medial and Lateral Check Ligaments
|
|
|
What are the secondary actions of the superior rectus?
|
Adduction and Intorsion
|
|
|
What are the secondary actions of the inferior rectus?
|
Adduction and Extorsion
|
|
|
What are the primary and secondary actions of the Superior Oblique muscle?
|
The primary action is Intorsion
The secondary actions are depression and abduction |
|
|
What are the primary and secondary actions of the Inferior Oblique muscle?
|
The primary action is Extorsion
The secondary action is elevation and abduction |
