Step 1: Recall the feather analogy used for skeletal muscle architecture. In pennate muscle the fascicles attach obliquely to the tendon. Counting the number of tendon-feeding rows tells you the subtype: one row is unipennate, two rows is bipennate, and many rows is multipennate. Step 2: The pectoralis major depicted here gathers numerous oblique fibre rows that all insert into one tendon at the bicipital groove of the humerus. Multiple oblique rows draining into a common tendon define a multipennate pattern. Step 3: Eliminate the rest. A strap-like parallel muscle (for example sartorius) would show fibres straight along the muscle belly, not oblique. A unipennate design (extensor digitorum longus) shows fibres on a single side only. Cruciate is not a recognised fascicle class and is a trap option. \[\boxed{\text{Multipennate}}\]
