Cerebrum

Definition

The anterior, dorsal portion of the brain derived from the embryonic forebrain (prosencephalon), comprising the paired cerebral hemispheres and associated structures. In vertebrates, it contains the cerebral cortex, basal ganglia, and olfactory bulbs; in arthropods, the term is applied loosely to the supraesophageal ganglion or its anterior lobes, though arthropod neuroanatomy uses distinct segmental terminology (protocerebrum, deutocerebrum, tritocerebrum).

Etymology

Latin cerebrum, 'brain'

Example

In honey bees (Apis mellifera), the protocerebrum—the arthropod homologue most comparable to the vertebrate cerebrum—contains the mushroom bodies and optic lobes that integrate sensory information for learning and navigation.

Synonyms

• telencephalon
• endbrain

Related Terms

• Protocerebrum
• deutocerebrum
• supraesophageal ganglion
• mushroom bodies
• cerebral cortex
• neuropil

Usage Notes

In arthropod literature, 'cerebrum' is often avoided in favor of precise ganglionic terms; when used, it typically refers to the protocerebrum or the entire supraesophageal mass. The term carries strong vertebrate connotations and should be applied to invertebrates with explicit qualification.