The tentorium (plural tentoria) is a term used to refer to the framework of internal supports within an

arthropod Arthropods (, (gen. ποδός)) are invertebrate animals with an exoskeleton, a segmented body, and paired jointed appendages. Arthropods form the phylum Arthropoda. They are distinguished by their jointed limbs and cuticle made of chiti ...

head. The tentorium is formed by ingrowths of the

exoskeleton An exoskeleton (from Greek ''éxō'' "outer" and ''skeletós'' "skeleton") is an external skeleton that supports and protects an animal's body, in contrast to an internal skeleton (endoskeleton) in for example, a human. In usage, some of the ...

, called apophyses, which fuse in various ways to provide rigid support for the muscles of the head.

References

Arthropod anatomy Animal head {{Arthropod-anatomy-stub