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Forearm muscle with channel number.
| Muscle position | |
|---|---|
| Ch. 1 | Extensor carpi radialis (ECR) |
| Ch. 2 | Extensor carpi ulnaris (ECU) |
| Ch. 3 | Flexor carpi ulnaris (FCU) |
| Ch. 4 | Flexor carpi radialis (FCR) |
| Ch. 5 | Abductor pollicis longus (APL) |
| Ch. 6 | Flexor digitorum superficialis (FDS) |
| Ch. 7 | Flexor digitorum profundus (FDP) |
