eyestalk

thumb|Pulmonata|Pulmonate [[land snails usually have two sets of tentacles on their head: the upper pair have an eye at the end; the lower pair are for olfaction.]]

In anatomy, an eyestalk (sometimes spelled eye stalk and also known as an ommatophore) is a protrusion that extends an eye away from the body, giving the eye a better field of view. It is a common feature in nature and frequently appears in fiction.