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These are four paired muscles on the underside of the occipital bone; the two straight muscles (rectus) and the two oblique muscles (obliquus). The muscles are named Rectus capitis posterior major goes from the spinous process of the axis (C2) to the occipital bone.
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 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.
Located in the superior orbital fissure. Innervates the levator palpebrae superioris, superior rectus, medial rectus, inferior rectus, and inferior oblique, which collectively perform most eye movements. Also innervates the sphincter pupillae and the muscles of the ciliary body. IV Trochlear: Motor
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 rectus muscle is related to the other extraocular muscles, particularly to the medial rectus muscle and the lateral rectus muscle. [3] The insertion of the superior rectus muscle is around 7.5 mm from the insertion of the medial rectus muscle, around 7.1 mm from the insertion of the lateral rectus muscle, and around 7.9 from the corneal limbus. [1]