Fig. 6. (A) A photograph of a pregnant male seahorse with three transverse planes through the brood pouch indicated by lines 1-3. (B) MRI scans of transverse planes 1-3 (top to bottom). The positions of individual pouch embryos (PE) around the periphery of the brood pouch are indicated by arrows and the empty interior of the brood pouch is indicated by arrowheads. (C,D) Photographs of ventrally and dorsally located embryo attachment sites within the brood pouch (arrows). Ventrally located attachment sites are very shallow in comparison to those located dorsally. Scale bars, (A) 1.3 cm; (C,D) 3 mm.