Anatomy

Anatomical descriptions are based on four imaginary planes that pass through the body in the anatomical position.

Tear Circulation
Tears enter the conjunctival sac from lacrimal gland
Conjuctival sac has capacity of 25-30mls
From here tears flow to lacus lacrimalis and to the canaliculi
Contraction of orbicularis oculi compresses the canaliculi and causes dilatation of lacrimal sac
Tears flow down nasolacrimal duct due to gravity…