I have been doing the practice questions on the TTP Training Program Partnership Resource
There have been references to "muscle pairs" for example in the Peripheral Nerve questions (question 3 on my set), it said that fibularis brevis and fibularis longus (peroneus brevis and peroneus longus) are a muscle pair.
There was another question suggesting that coracobrachialis and pectoralis are another muscle pair. Also, extensor pollicis longus and latissimus dorsi as another pair.
Please can anyone explain the defintion of a muscle pair.