Which prefix refers to the head?

The prefix that refers to the head is "Cephal-." This term is derived from the Greek word "kephalē," which means head. It is commonly used in various medical and anatomical contexts to describe locations or conditions related to the head. For instance, in terms like "cephalalgia," which means headache, the prefix highlights the involvement of the head in the condition being described.

In contrast, the other prefixes provided do not refer to the head. "Caud-" refers to the tail or tail-like structures, while "Plasm-" pertains to anything related to plasma or cytoplasm in a biological context. "Oma-" is a suffix typically used to denote tumors or abnormal growths, particularly in the context of specific types of tumors, and does not have a connection to the structure of the head. Thus, "Cephal-" is the clear choice when indicating a relationship to the head in medical terminology.