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The superior oblique muscle loops through a pulley-like structure (the trochlea of superior oblique) and inserts into the sclera on the posterotemporal surface of the eyeball. It is the pulley system that gives superior oblique its actions, causing depression of the eyeball despite being inserted on the superior surface. Superior oblique nerve
The last muscle is the inferior oblique, which originates at the lower front of the nasal orbital wall, passes inferiorly over the inferior rectus muscle on its path laterally and posteriorly, and inserts under the lateral rectus muscle on the lateral, posterior part of the globe. Thus, the inferior oblique pulls the eye upward and laterally.
The body of the superior oblique muscle is located behind the eyeball, but the tendon (redirected by the trochlea) approaches the eyeball from the front. The tendon attaches to the top (superior aspect) of the eyeball at an angle of 51 degrees concerning the primary position of the eye (looking straight forward).
An injury to the trochlear nucleus in the brainstem will result in an contralateral superior oblique muscle palsy, whereas an injury to the trochlear nerve (after it has emerged from the brainstem) results in an ipsilateral superior oblique muscle palsy. The superior oblique muscle which the trochlear nerve innervates ends in a tendon that ...
Oblique Superior and inferior 2 1 oblique, superior: head, extraocular (left/right) annulus of Zinn at orbital apex, medial to optic canal: outer posterior quadrant of eyeball: ophthalmic artery, lateral muscular branch trochlear nerve [CNIV] abducts, intorts, and depress eye: right medial, superior, and inferior recti (superior and inferior ...
The levator palpebrae superioris receives motor innervation from the superior division of the oculomotor nerve. [1] [2] [3] The smooth muscle that originates from its undersurface, called the superior tarsal muscle is innervated by postganglionic sympathetic axons from the superior cervical ganglion.
The two oblique muscles are the internal and external obliques. They're important for core stability and a slimmer waist. Try the 9 best oblique exercises.
The obliquus capitis superior muscle (/ ə ˈ b l aɪ k w ə s ˈ k æ p ɪ t ɪ s /) is a small [citation needed] muscle in the upper back part of the neck. It is one of the suboccipital muscles . It attaches inferiorly at the transverse process of the atlas (first cervical vertebra) ; it attaches superiorly at the external surface of the ...