Sphenoid bone - internal view There are four main parts to the sphenoid bone: the body (corpus), the lesser and greater wings (alae minores et majores) and the pterygoid processes. The body is the most centrally positioned portion. Anteriorly it contributes to the nasal cavity, laterally it builds the medial wall of the optic canal.
The anchor you chose will depend on the type of anchoring you do. Cruising anchors are larger plow or claw anchors capable of holding boats to various bottoms. Kedging, Forfjord and Workboat anchors are used on commercial vessels.
1 Screw-in moorings are a modern method. 2  The anchor in a screw-in mooring is a shaft with wide blades spiraling around it so that it can be screwed into the substrate. 3  The advantages include high holding-power-to-weight ratio and small size (and thus relative cheapness).