Muscles
Muscle Attachment
• Tendon (attaches muscle to bone)—white fibrous
connective tissue made up of the protein called collagen
• Muscle Origin- is the attachment site that doesn't move
during contraction (proximal)
• Muscle Insertions- is the attachment site that does move
when the muscle contracts (distal)
Muscle Movement
Muscle contraction results in different types of
movement. The particular movement is a direct result
of the muscle attachment.
Ex. Biceps performs flexion of the forearm as the
forearm is moved
Muscle Movement
• There are around 640 muscles in the human body
• When movement of a body part occurs, muscles work in
groups rather than individually.
• During that particular movement, individual muscles will play
different roles depending on their origin and insertion.
• Agonist- prime mover, is the muscle that is primarily
responsible for the movement (contracts)
• Antagonist- its action opposes that of the agonist (relaxes)
• Synergist Muscles- a muscle which acts with another.
Anterior Muscles
Posterior Muscles