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External Features and Muscle System (3663 words) |
 | In the head region, hypobranchial muscles are formed from somites behind the gills that move (as embryonic mesenchyme) forward to the ventral region of the pharynx (between the gills). |
| These muscles can be divided into two groups: the two oblique muscles which have their origins very close together in the anterior medial corner of the orbit and the four rectus muscles which have their origins in the posterior medial corner of the orbit. |
| Be careful not to confuse the inferior oblique muscle, which runs from the eyeball to the medial wall of the orbit, with the optic nerve. |
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Superior oblique muscle - Wikipedia, the free encyclopedia (766 words) |
| The superior oblique muscle, or obliquus oculi superior, is a fusiform muscle in the upper, medial side of the orbit whose primary action is intorsion and whose secondary actions are to abduct (laterally rotate) and depress the eyeball (i.e. |
| The primary action of the superior oblique muscle is intorsion; the secondary action is depression (primarily in the adducted position); the tertiary action is abduction. |
| The tendon is reflected backward, lateralward, and downward beneath the superior rectus to the lateral part of the bulb of the eye, and is inserted onto the scleral surface, behind the equator of the eyeball, the insertion of the muscle lying between the superior rectus and Rectus lateralis. |
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