fulcro-cranial muscle
From ZooTerms (Dictionary of Invertebrate Zoology)
fulcro-cranial muscle: 1. A muscle arising from the postoccipital phragma or ridge and inserted on the fulcrum in the thysanuran Lepismodes and mayfly nymphs.
2. In the blattoid Periplaneta and lower apterygotes, a muscle arising from each of the posterior tentorial arms.
