SQL Server distinguishes between 3 different types of latches: 1  IO Latches. 2  Buffer Latches (BUF) 3  Non-Buffer Latches (Non-BUF) Letâs have a more detailed look at these 3 different variations. I/O Latches are used by SQL Server when outstanding I/O operations against pages in the Buffer Pool are done â when you read and write from/to your storage subsystem.
The pharyngeal muscles are a group of muscles that act upon the pharynx. Pharyngeal muscles contracts pushing the food into the oesophagus.There are two muscular layers of the pharynx: the outer circular layer and the inner longitudinal layer.The outer circular layer includes: 1  Inferior constrictor muscle.2  Middle constrictor muscle.haryngeal muscles contracts pushing the food into the oesophagus. There are two muscular layers of the pharynx: the outer circular layer and the inner longitudinal layer. The outer circular layer includes: 1  Inferior constrictor muscle. 2  Middle constrictor muscle.
Above: an intersegmental septum in the earthworm Lumbricus terrestris. The lines indicate the orientation of the various muscle fibres that make up this membrane. Holes in the membrane allow the dorsal vessel, gut and nerve cord and associated vessels to cross the septum.o accomplish this, the neural foramen is surrounded by circular muscle fibres that form a sphincter. Contraction of these muscle fibres makes the foramen smaller, closing the seal, whilst relaxing the sphincter opens the foramen and allows coelomic fluid to pass from one segment to the next.