Presentation on theme: "The Muscular System Chapter 7"— Presentation transcript:
1The Muscular System Chapter 7 The anatomical system of a species that allows it to move. The muscular system in vertebrates is controlled through the nervous system, although some muscles are (such as the cardiac muscle) can be completely autonomous.
2Overview of Muscular System Types of Muscle TissueUnder voluntary controlSkeletal musclesUnder involuntary controlCardiac muscleSmooth musclevisceral organs
3Overview of Muscular System Skeletal muscles attach to bones directly or indirectlyPerform five functionsProduce movement of skeletonMaintain posture and body positionSupport soft tissuesGuard entrances and exitsMaintain body temperature
4Anatomy of Skeletal Muscles Gross AnatomyConnective tissue organizationEpimysiumFibrous covering of whole musclePerimysiumFibrous covering of fascicleEndomysiumFibrous covering of a single cell (a muscle fiber)Tendons (or aponeurosis)- at each end of the muscle, the collagen fibers of all three layers come together to form either a bundle or a broad sheet.
5Anatomy of Skeletal Muscles The Organization of a Skeletal MuscleFigure 7-1
7Anatomy of a Muscle Fiber Microanatomy of a Muscle FiberSarcolemmaPlasma membraneSarcoplasmcytoplasmSarcoplasmic reticulum (SR)Like smooth ERTransverse tubules (T tubules)Myofibrils (contraction organelle)SarcomeresInside a single fiber
8Anatomy of Skeletal Muscles Sarcomere—Repeating structural unit of the myofibrilComponents of a sarcomereMyofilamentsThin filaments (mostly actin)Thick filaments (mostly myosin)Z lines at each endAnchor for thin filamentsFilament – a chain of cells