Figure 24. Schematic frontal view of the arrangement of muscles associated with the AME, after Land (1969b, Pelegrina aeneola). Land described how, in dissection, these appeared as two sets per eye (1-6-3 and 2-5-4). Muscles 1-4, originating on the carapace, are extraocular muscles. Note that the dorsal muscles (3, 4) originate toward the rear of the ocular quadrangle, and the ventral muscles (1, 2) originate at the clypeus. The wide but thin circular muscles (5 and 6) are ocular muscles. These encircle the eye tube obliquely on either side, joining the extraocular muscles where they originate at either the top or the bottom of the eye tube. Muscle 2 divides into two branches, one of which (2b) joins muscle 1 before a common lateral origination point on the clypeus.