The contents of the larger posterior cervical triangle, formed by B, the sterno-mastoid before; 9, the Splenius; and 8, the trapezius behind, and by the clavicle below, are the following mentioned structures-viz.
"Surgical Anatomy"
Joseph Maclise
9. Splenius capitis and colli muscle.
"Surgical Anatomy"
Joseph Maclise
These separate superior attachments, and the division of the muscle which results, have caused the Splenius to be regarded as formed of two portions: Splenius of the head, and Splenius of the neck.
"Artistic Anatomy of Animals"
Édouard Cuyer