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. 2020 Oct 7;61(12):5. doi: 10.1167/iovs.61.12.5

Figure 3.

Figure 3.

A thin tendon from the SR origin to the common tendon for the other three rectus muscles in a fetus with a CRL of 217 mm. (A) The most superior site and (H) the most inferior site. (B and C) The SR originates from the sphenoid (black star in each image). (F–H) The LR, IR, and MR have a common origin (open star in K). (G) The common origin. The IR is between the LR and MR. (C) The accessory head of the MR (arrows) is adjacent to the lateral aspect of the origin of the SO. (D and E) The accessory head is detached. (F) An inferior view shows that the major head of the MR originates from the bone. (E) A thin fibrous band (arrowhead) that is shown at a higher magnification in (J). Images (I and K) are near sections of (J). The fibrous band (surrounded by a green line) extends from the inferior end of the SR (I) to the common tendinous origin for three rectus muscles (open star in F–H and K). (A–H) At ×1 objective) and (I–K) at ×2 objective were prepared at the same magnification, respectively (scale bars in A and J = 1 mm). ABN, abducent nerve; FN, frontal nerve; OCN, oculomotor nerve; ON, optic nerve; OPA, ophthalmic artery; OPN, ophthalmic nerve; SPS, superior petrosal sinus.