Ventralis oblique muscle (Vom)
The ventralis oblique muscle is a sheet-like muscle with oblique fibers
that runs ventrally to the depressor palpebrae inferioris muscle. This
muscle is situated on the anteroventral surface of the eyeball in the
nasal pole direction. It originates from fleshy fibers of the
parabasisphenoid bone, fanning out to insert as aponeurosis on the
scleral cartilage. The aponeurosis of the ventralis oblique muscle
passes over the dorsal surface of the aponeurosis of the ventralis
rectus muscle. Its insertion site is dorsal to the insertion site of the
ventralis rectus muscle on the scleral cartilage. The origin of
ventralis oblique muscle is located ventral to the optic nerve and
anteroventral to the origin of the dorsalis oblique muscle\RL.
Origin: Fleshly, from the parabasisphenoid bone\RL.
Insertion: Aponeurotic, on the scleral cartilage\RL.
Function: Depresses the eyeball and causes rotation
(intorsion/extorsion).