ARHINENCEPHALY.

Abstract

No human brain has yet been described in which all the structures which are believed to be subservient to the sense of smell have been absent, and consequently the designation " arhinencephaly " is misleading in that it suggests complete absence of a functional unit. In the majority of recorded cases the maldevelopment present has been either a partial or a complete absence of the olfactory bulbs and parts of the hippocampal formation with its association and commissural systems. In this limited sense the term " arhinencephaly" may perhaps be sanctioned on the grounds that it affords a concise and convenient title for a condition which otherwise would be difficult to define within the compass of a few words.