There are five, like five digits of your hand.
Place your thumb into your palm, then lay that hand palm down on your other arm, as shown in diagram.
Your 4 fingers now show distribution: spells PFPF [pass/fail, pass/fail]:
Pronator teres
Flexor carpi radialis
Palmaris longus
Flexor carpi ulnaris
Your thumb below your 4 fingers shows the muscle which is deep to the other four: Flexor digitorum superficialis.
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