It covers the rectus and vastus externus portions of the triceps cruris; it is also in relation with the gluteal muscles.
In the dog and the cat the vastus externus is the most voluminous of the three portions which constitute the triceps muscle.
We also partly see there, in these animals, the vastus internus and the rectus of the triceps (see Fig. 87).
The two fasciculi then pass towards the knee, being in relation with the rectus and the vastus internus of the triceps.
vastus animus immoderata, incredibilia, nimis alta semper cupiebat.
Ossification in the crureus or vastus lateralis muscle has been frequently observed as a result of a kick from a horse.