Figure 16 in Neurobiology and vision of jumping spiders (Araneae: Salticidae)

Figure 16. General structure of the AME and related visual centers. 1, Camera lucida drawing of a parasagittal section of the anterior prosoma of a fifth instar Phidippus clarus. Since retinal layers I and II are dorso-ventrally elongated and boomerangshaped, only the dorsal and ventral arms of these layers can be seen in this view. The columnar matrix that is shown here is quite visible in stained sections, but has not been mentioned in other studies. In older spiders, the midgut digestive diverticulae (dd) are much larger than this. 2, Camera lucida drawing composited from several horizontal sections of the prosoma of a sixth instar P. johnsoni. In this view only the central, foveal part of the retina can be seen. Sections of the outer and inner lobes of the first AME neuropile (AME I) can be seen. 3, Semi-schematic dorsal view with the AME of a fifth instar P. clarus presented in horizontal section, showing the relationship of the eyes to the reconstructed lobes of the AME I neuropile. As a convention with the AME and the other eyes, distal refers to a direction along the optical axis toward the cornea, and proximal is a direction away from the cornea, toward the retina and optic nerve. As noted by Land (1969a), each AME optic nerve rotates by ~90° between the eye and AME1, although the degree of this rotation varies when the eye-tube is rotated. Note that some shrinkage and distortion did occur as part of the preparation of these sections, which were stained with Masson Trichrome. After Hill (1975, 2006).