1.04 STRUCTURES OF 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 the muscular system

The Muscular System: Muscle Fibers Bundles of threadlike structures called myofibrils Composed of: Myosin- thick myofibrils made of proteins Actin- thin myofibrils made of proteins Form overlapping pattern called sarcomere muscle muscle fiber sarcolemma sarcomere functional unit of muscle movement 1.04 Remember the structures of the muscular system

Structures of the muscular system Muscles Skeletal Smooth Cardiac Sphincter Connective tissue Tendons Fascia 1.04 Remember the structures of the muscular system

Structures of the muscular system Types of muscle Skeletal Smooth Cardiac Sphincter 1.04 Remember the structures of 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 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 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 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 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 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 the muscular system

How do skeletal muscles get their names? Location-where Number/Location of origin and insertion Size-maxi/mins Action Number of origins Shape Combination 1.04 Remember the structures of the muscular system However, not all muscles are named by the above methods!

Head & Neck Muscles pg. 204-205 1.04 Remember the structures of the muscular system

Torso/Trunk pg 204-205 (anterior) 1.04 Remember the structures of the muscular system

Torso/Trunk (anterior) 1.04 Remember the structures of the muscular system

Torso/Trunk (posterior) 1.04 Remember the structures of the muscular system

Upper extremities 1.04 Remember the structures of the muscular system

Lower extremities 1.04 Remember the structures of the muscular system