posterior triangle of neck

[32pearls]

Hi,hope somebody can answer this question:

Each of the following muscles usually appear in the floor of the posterior triangle Except

1.sternohyoid
2.medius scalene
3.splenius capitis
4.Lev.scapulae
5.anterior belly of omohyoid

The ans which first came to my mind was sternohyoid [and thats the ans given in the key] but I'm a little confused: couldn't it be anterior belly of omohyoid too? Isn't inferior belly of omohyoid in the floor of postr.triangle?
Thanks

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