The<unk>  (internal<unk><unk> , two in number, superior and inferior, arise from the ophthalmic, opposite the pulley of the Obliquus superior; they leave the orbit to encircle the eyelids near their free margins, forming a superior and an inferior arch, which lie between the Orbicularis oculi and the tarsi.
The superior<unk>  anastomoses, at the lateral angle of the orbit, with the zygomaticoörbital branch of the temporal artery and with the upper of the two lateral<unk>  branches from the lacrimal artery.
The inferior<unk>  anastomoses, at the lateral angle of the orbit, with the lower of the two lateral<unk>  branches from the lacrimal and with the transverse facial artery, and, at the<unk>  part of the lid, with a branch from the angular artery.
From this last anastomoses a branch passes to the nasolacrimal duct, ramifying in its mucous membrane, as far as the inferior meatus of the nasal cavity.
Medial palpebral arteries
Ophthalmic artery
Labyrinthine artery
Superficial temporal artery
Basilar artery
Pontine arteries
Vertebral artery
Scalp vein