You do not sculpt muscles individually. You sculpt planes . The muscle data merely tells you why the plane bulges or hollows.
The best will include a section on the Asaro head or the Loomis planes. This is the translation of biology into geometry. head and neck anatomy for sculptors pdf
The gap between a medical diagram and a clay portrait is and fascia . A medical text shows the platysma muscle as a thin sheet. A sculptor sees the platysma as the reason the neck turns into vertical cords when an old man shouts. You do not sculpt muscles individually
Each muscle group (masseter, temporalis, orbicularis oculi/oris, platysma, etc.) shown in layered, color-coded illustrations—so you understand both function and form. etc.) shown in layered