Final answer:
The term 'intramuscular' meaning 'within the muscle' consists of the prefix 'Intra-', the root 'muscul-', and the suffix '-ar'.
Step-by-step explanation:
The term that means 'within the muscle' is constructed using a prefix, root, and suffix. The correct combination for this term is 'Intra-', 'muscul-', and '-ar'. Therefore, the correct term is intramuscular, where 'Intra-' refers to 'within', 'muscul-' is the root referring to 'muscle', and '-ar' is a suffix that pertains to something relating to the subject at hand, which in this case is the muscle. Unlike '-itis', which indicates inflammation and would not be correct in this context, '-ar' simply creates an adjective that describes the location or relation to the muscle.