Depressor palpebral inferioris muscle (Dpim)
The depressor palpebrae inferioris muscle is formed of tiny muscle fibers scattered within the periorbital fascia. It runs dorsally, covering the ventralis rectus muscle and ventralis oblique muscle. This muscle extends from its origin on the fleshly parabasisphenoid bone, fanning out towards its insertion on the connective tissue of the lower eyelid\RL.
Origin: Fleshly, from the parabasisphenoid bone\RL.
Insertion: Aponeurotic, on the connective tissue of the lower eyelid\RL.
Function: Contraction of the depressor muscle pulls the lower eyelid, resulting in the opening of the palpebral fissure.