Chiasmal is a medical term that refers to the region of the brain where the optic nerves cross over each other. It is also called the optic chiasm. Synonyms for chiasmal include optic chiasm, optic commissure, and chiasmatic region. The term chiasmal is commonly used in the diagnosis and treatment of neurological disorders that affect the optic nerves and vision. These disorders may include pituitary tumors, multiple sclerosis, and optic nerve gliomas. Understanding the different synonyms for chiasmal can be beneficial for healthcare professionals as well as patients seeking information about their medical conditions.