Which movement is mediated by superior oblique muscle?
Which movement is mediated by superior oblique muscle?
Incyclotorsion is a term applied to the inward, torsional (rotational) movement of the eye, mediated by the superior oblique muscle of the eye. The superior oblique muscle is innervated by cranial nerve IV (trochlear nerve).
What does the superior oblique eye muscle do?
These muscles are unique in that they do not originate from the common tendinous ring, have an angular attachment to the eyeball, and they attach to the posterior aspect of the eyeball. The superior oblique functions explicitly to move the eye in the down-and-out position and intort the eye.
How does the inferior oblique muscle move the eye?
Due to its oblique course and attachment on the posterolateral side of the eyeball, contraction of the inferior oblique muscle pulls the eyeball in a direction posterior to its vertical axis, and therefore rotates the eye laterally around this axis.
Which cranial nerve is responsible for lateral eye movement?
The extraocular muscles are innervated by lower motor neurons that form three cranial nerves: the abducens, the trochlear, and the oculomotor (Figure 20.3). The abducens nerve (cranial nerve VI) exits the brainstem from the pons-medullary junction and innervates the lateral rectus muscle.
Which muscle moves the eye upward and away from midline?
lateral rectus
The lateral rectus is a muscle of the eye’s orbit. The main function of this muscle is to pull the pupil away from the midline of the body.
Which nerve supplies the superior oblique muscle of the eyeball?
The superior oblique muscle, or obliquus oculi superior, is a fusiform muscle originating in the upper, medial side of the orbit (i.e. from beside the nose) which abducts, depresses and internally rotates the eye. It is the only extraocular muscle innervated by the trochlear nerve (the fourth cranial nerve).