Composition of the posterolateral (PL) muscle chain Main structures of the PL chain Muscles of the chain of the lower limbs: Gluteus medius. External hamstrings (short and long portion of the biceps femoris) Vastus lateralis
Composition of the postero-anterior-anterior-posterior (PA AP) muscle chain: The main chain has 4 muscle groups, each with a specific function: The Sentinel Group of the Vertical Axis: Deep posterior muscles of the spine: Multifids. Inter
Composition of the postero-median muscle chain: The main part consists of the head and trunk muscles, from top to bottom: –Tensed musculo-aponeurotic structures from the occiput to the orbital region. –Semispinatus, longissimus of the head.