A redux of the previous study on Serratus Anterior. It was hastily drawn up that time and I have been wanting to do a neater version since then.
I have Burne Hogarth's book on Dynamic Anatomy for years. Only recently I started reading in details. To correctly place the Serratus Anterior, imagine a line starting at the pit of the neck, 45 degree down, past the nipple and there you have it.
The maximum number of Serratus slots a human can have is six but that 6th slot is only visible when the arms are raised. In drawing, it makes sense to stick to 5 slots or less. In reality, this particular muscle group are hard to build and most guys have to work really hard (and must be very lean) to have all 5 of their Serratus Anterior show up.