Sternum

Pronunciation: /STUR-num/

Category: Anatomy

Singular: Sternum

Plural: Sterna

Definition

The ventral (underside) part of an arthropod's body segment, particularly pronounced in insects and arachnids, which serves as an attachment point for muscles and supports the structure of the body.

Etymology

From Latin 'sternum' and Greek 'stērnon', meaning 'chest' or 'breastbone'.

Example

In the anatomy of a spider, the sternum forms part of the cephalothorax, aiding in the protection and structural support of the arachnid's body.

Synonyms

Breastplate
Ventral plate

Related Terms

Dorsum
Pleuron
Exoskeleton
Thorax

Usage Notes

The sternum can vary greatly in size and shape among different species and serves as an important site for muscle attachment.