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Fig. 2. Subvertebral and brachial sac pressures measured for one C.
marinus during a single breath. Inspiration (solid horizontal line) and
expiration (broken horizontal line) are indicated above the subvertebral
pressure trace. Note that subvertebral sac pressure (top trace) increases
during inspiration with little or no change in brachial sac pressure (bottom
trace). During expiration there is a decrease in subvertebral sac pressure
that is rapidly transmitted to the brachial sac.