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.
To set an anchor it is dropped to the bottom, then the boat is allowed to slowly drift or slowly powers downwind or downcurrent feeding out line. Once the line is out, the boat is allowed to drag the anchor to set it. Sometimes this is done when half of the line is fed out then the rest of the line is played out.