The central tendon is shaped somewhat like a trefoil leaf, consisting of three divisions or leaflets separated from one another by slight indentations.

The central tendon is composed of several planes of fibers, which intersect one another at various angles and unite into straight or curved bundles—an arrangement which gives it additional strength.

During inspiration, the diaphragm contracts, causing the central tendon to be drawn inferiorly which partially flattens the domes bilaterally.

During inspiration, the central tendon retains its shape due to its tendinous nature, and prevents constriction of the inferior vena cava.

[2] This article incorporates text in the public domain from page 406 of the 20th edition of Gray's Anatomy (1918)