orbital septum(redirected from arcus marginale)
a fibrous membrane attached to the margin of the orbit and extending into the lids, containing the orbital fat and constituting in great part the posterior fascia of the orbicularis oculi muscle.
Synonym(s): septum orbitale [TA]
Farlex Partner Medical Dictionary © Farlex 2012
A fibrous sheet extending partially across the anterior opening of the orbit within the eyelids.
See also: septum
Medical Dictionary, © 2009 Farlex and Partners
A thin membrane containing collagenous and elastic fibres which is attached to the orbital margin at a thickening called the arcus marginale. It is continuous with the tarsal plates of the upper and lower eyelids except where it is pierced by the fibres of the levator palpebrae superioris muscle in the upper lid and the expansion from the inferior rectus in the lower lid. Syn. palpebral fascia; septum orbitale. See dermatochalasis; eyelids; tarsus.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann