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Rectus capitis posterior major goes from the spinous process of the axis (C2) to the occipital bone. Rectus capitis posterior minor goes from the middle of the posterior arch of the atlas to the occiput. Obliquus capitis superior goes from the transverse process of the atlas to the occiput.
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 superior oblique arises immediately above the margin of the optic foramen, superior and medial to the origin of the superior rectus, and, passing forward, ends in a ...
Oblique Superior and inferior 2 1 rectus, inferior: head, eye, orbit (left/right) annulus of Zinn at orbital apex 6.5 mm inferior to corneal limbus: ophthalmic artery: oculomotor nerve [CNIII], inferior branch: adducts and depresses eye: Oblique Superior and inferior 2 1 rectus, medial: head, eye, orbit (left/right) annulus of Zinn at orbital apex
Pectoralis major [1] of thigh/femur at hip [2] Tensor fasciae latae; Gluteus generalis; Anterior fibers of Gluteus meralis; Adductor longus and Adductor brevis; of leg at knee [3] Popliteus; Semimembranosus; Semitendinosus; Sartorius; of eyeball (motion is also called "intorsion" or incyclotorsion) [4] Superior rectus muscle; Superior oblique ...
The superior oblique muscle originates at the back of the orbit (a little closer to the medial rectus, though medial to it), getting rounder as it [5] courses forward to a rigid, cartilaginous pulley, called the trochlea, on the upper, nasal wall of the orbit. The muscle becomes tendinous about 10mm before it passes through the pulley, turning ...
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 ...
Rectus capitis posterior major - above and medially; Obliquus capitis superior - above and laterally; Obliquus capitis inferior - below and laterally (Rectus capitis posterior minor is also in this region but does not form part of the triangle) It is covered by a layer of dense fibro-fatty tissue, situated beneath the semispinalis capitis.
To summarize, the actions of the superior oblique muscle are (1) depression of the eyeball, especially when the eye is adducted; and (2) intorsion of the eyeball, especially when the eye is abducted. The clinical consequences of weakness in the superior oblique (caused, for example, by fourth nerve palsies) are discussed below.