Iris is the Greek goddess of rainbows. Lymph is the Latin derivation of Nymph (water spirits). The Atlas bone C1 vertebrae has been mentioned.

There are several small structures in the brain whose names are derived from Greek or Egyptian via Greece mythological characters. The nucleus edymalis (aka nucleus reuniens), which is part of the thalamus is named for the boy Zeus fancied & offered a gift. He chose eternal youth who slumbers forever. The thalamus has been described as cushion armrests. Interestingly, we now know the nucleus edymalis & thalamus in general is connected to sleep regulation. That wasn't known when the naming was done.

The cornu ammonis is named for the Egyptian god Amun-Ra (aka Ammon) because it looks like ram's horns, which that god is often depicted as having.

There is a cerebral venous malformation that is sometimes called caput Medusa.