There is no upper abs - it's one muscle dude. And nowt wrong with an opinion, just don't get it mixed up with fact.
This.
Rectus Abdominus is one muscle seperated by tendons. Internal & External Obliques and Transverse abdominals are the only other abdominal groups.
As I'm sure you know the pec minor sits behind the pec major but you can't fire muscle fibres at one end/side. The all or nothing principle, muscle fibres either contract or they don't contract at all, the heavier the load the more fibres that are recruited. So it's really a case of recruiting as many/all the fibres you can.
You don't tend to get people with a massively over developed upper chest and a non existant lower chest (I'll let upper & lower slide here). Certain angles or exercises may give the illusion of working the upper/lower chest but the truth is that it's just most of the fibres in pectoral muscle are contracting for a change.
This arguement is on the same bandwagon as 'toning'.
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