porus acusticus externus

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 [por´us] (L.)
porus acus´ticus exter´nus the outer end of the external acoustic meatus.
porus acus´ticus inter´nus the opening of the internal acoustic meatus in the cranial cavity.
porus op´ticus the opening in the sclera for passage of the optic nerve.

ex·ter·nal a·cous·tic pore

the orifice of the external acoustic meatus in the tympanic portion of the temporal bone.

porus acusticus externus

The outer opening of the external acoustic meatus.
See also: porus