1.04 Remember the structures of the muscular system Essential Question • What are the structures of the muscular system? 1.04 Remember the structures of 2 the muscular system The Muscular System • Comprises nearly half our weight. • Over 650 muscles. • Each muscle is made up of hundreds or thousands of muscle fibers. 1.04 Remember the structures of 3 the muscular system The Muscular System: Muscle Fibers • Bundles of threadlike structures called myofibrils – Composed of: • Myosin • Actin – Form overlapping pattern called sarcomere muscle muscle fiber sarcolemma sarcomere functional unit of muscle movement 1.04 Remember the structures of 4 the muscular system Structures of the muscular system Muscles Connective tissue . Skeletal . Tendons . Smooth . Fascia . Cardiac . Sphincter 1.04 Remember the structures of 5 the muscular system Structures of the muscular system Types of muscle . Skeletal . Smooth . Cardiac . Sphincter 1.04 Remember the structures of 6 the muscular system Structures of the muscular system Types of Muscle Skeletal muscles . Attached to bone . Striated (striped) appearance . Voluntary . Multinucleated muscle cell bundles 1.04 Remember the structures of 7 the muscular system Structures of the muscular system Types of Muscle Smooth muscles . Also known as visceral muscles . Involuntary . Located in walls of digestive system, uterus & blood vessels 1.04 Remember the structures of 8 the muscular system Structures of the muscular system Types of Muscle Cardiac muscle . Found only in the heart . Striated, branched . Involuntary . Cells are fused- when one contracts, they all contract, creating the heartbeat 1.04 Remember the structures of 9 the muscular system Structures of the muscular system Types of Muscle Sphincter muscles . Also called dilator muscles . Special, circular muscles . Located in the . digestive system . urinary system 1.04 Remember the structures of 10 the muscular system Structures of the muscular system Types of Muscle . Skeletal . Smooth . Cardiac . Sphincter 1.04 Remember the structures of 11 the muscular system Structures of the muscular system Types of Connective tissue . Tendons . Fascia 1.04 Remember the structures of 12 the muscular system Structures of the muscular system Connective tissue . Tendons dense bands that connect skeletal muscle to the bone 1.04 Remember the structures of 13 the muscular system Structures of the muscular system Connective tissue . Fascia Fibrous connective tissue sheets that wrap around muscle bundles 1.04 Remember the structures of 14 the muscular system How do skeletal muscles get their names? • Location • Location of origin and insertion • Size • Action flexor • Direction • Extensor • Number of origins • Depressor • However, • not all muscles are named by the above methods! 1.04 Remember the structures of 15 the muscular system Head & Neck Muscles 1.04 Remember the structures of 16 the muscular system Torso/Trunk (anterior) 1.04 Remember the structures of 17 the muscular system Torso/Trunk (anterior) 1.04 Remember the structures of 18 the muscular system Torso/Trunk (posterior) 1.04 Remember the structures of 19 the muscular system Upper extremities 1.04 Remember the structures of 20 the muscular system Lower extremities 1.04 Remember the structures of 21 the muscular system The muscular system review Anterior view 1.04 Remember the structures of 22 the muscular system The muscular system review Posterior view 1.04 Remember the structures of 23 the muscular system 1.04 Remember the structures of the muscular system Essential Question • What are the structures of the muscular system? 1.04 Remember the structures of 24 the muscular system .