Page 140 - Biomedical Engineering and Design Handbook Volume 1, Fundamentals
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Rib cage
Intercostal
accessory
muscles
Lung
Crural Costal
diaphragm diaphragm
Abdomen
FIGURE 5.3 Mechanical model of inspiratory musculature. Intercostal
and accessory muscles are mechanical in parallel with the diaphragm. The
springs represent the elastic properties of the rib cage, lung, and abdomen.
Bar into which crural and costal fibers insert represents the central tendon
of the diaphragm. [From Macklem et al. (1983), with permission.]
P pl RL
A rl Lungs
P al
A rc
DI Diaphragm RD
A rd
P ab
Abdomen
A ab AB
P ab
FIGURE 5.4 Model representation of cheat wall structure, where RL,
RD, DI, and AB are the membrane of the rib cage, diaphragm, and the
abdomen. [From Ben-Haim and Siadel (1990), with permission.]
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