Theory Manual Version 3.4
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Subsection 4.1.2: Pentahedral Elements Up Section 4.1: Solid Elements Subsection 4.1.4: Quadratic Tetrahedral Elements

### 4.1.3 Tetrahedral Elements

Linear 4-node tetrahedral elements are also available in FEBio. Their shape functions are defined in function of the isoparametric coordinates , and . The following integration rules are implemented for this element type.
 1-point Gauss rule r s t w 0.25 0.25 0.25 0.166666667
 4-point Gauss rule r s t w 0.13819660 0.13819660 0.13819660 0.041666667 0.58541020 0.13819660 0.13819660 0.041666667 0.13819660 0.58541020 0.13819660 0.041666667 0.13819660 0.13819660 0.58541020 0.041666667

Different solid element types that are available in FEBio
Subsection 4.1.2: Pentahedral Elements Up Section 4.1: Solid Elements Subsection 4.1.4: Quadratic Tetrahedral Elements