Figure 11
From: Invertebrate neurophylogeny: suggested terms and definitions for a neuroanatomical glossary

Sheath. Vibratome section of the brain of the terrestrial hermit crab Coenobita clypeatus. The sheath is shown in red, somata in blue, neuropil in green. [Synapsin-like immunoreactivity (green) combined with nuclear (blue) and actin stains (red).] Abbreviations: ol = olfactory lobe with olfactory glomeruli; sh = sheath; sl = side lobe. From [314], creative common license of BMC.