1.04 STRUCTURES OF THE MUSCULAR SYSTEM. The Muscular System Comprises nearly half our weight. Over...

1.041.04STRUCTURES STRUCTURES OF THE OF THE MUSCULAR MUSCULAR SYSTEMSYSTEM

The Muscular SystemThe Muscular System• Comprises nearly half our weight.• Over 650 muscles.• Each muscle is made up of hundreds or

thousands of muscle fibers.

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The Muscular SystemThe Muscular System::Muscle FibersMuscle 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

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Structures of the muscular systemStructures of the muscular system

MusclesMusclesSkeletal

Smooth

Cardiac

Sphincter

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Connective tissueConnective tissue

Tendons

Fascia


Types of muscleTypes of muscleSkeletal

Smooth

Cardiac

Sphincter

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Types of MuscleTypes of Muscle

SKELETAL MUSCLESSKELETAL MUSCLES

Attached to boneAttached to bone

Striated (striped) appearanceStriated (striped) appearance

VoluntaryVoluntary

Multinucleated muscle cell bundlesMultinucleated muscle cell bundles

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SMOOTH MUSCLESSMOOTH MUSCLES

Also known as visceral muscles

Involuntary

Located in walls of digestive

system, uterus & blood vessels

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CARDIAC MUSCLECARDIAC MUSCLEFound only in the heartStriated, branchedInvoluntaryCells are fused- when one contracts, they all contract, creating the heartbeat 1

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SPHINCTER MUSCLESSPHINCTER MUSCLESAlso called dilator musclesAlso called dilator musclesSpecial, circular musclesSpecial, circular musclesLocated in the Located in the

digestive systemdigestive system urinary systemurinary system

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Tendons

dense bands that connect skeletal muscle to

the bone


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FasciaFasciaFibrous connective

tissue sheets that wrap around muscle bundles

How do skeletal muscles get How do skeletal muscles get their names?their names?

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• However, However, • not all muscles are named by the above methods!not all muscles are named by the above methods!

Head & Neck Muscles pg. 204-205Head & Neck Muscles pg. 204-205

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Torso/Trunk pg 204-205Torso/Trunk pg 204-205(anterior)

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Torso/TrunkTorso/Trunk(anterior)

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Torso/TrunkTorso/Trunk(posterior)

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Upper extremitiesUpper extremities

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Lower extremitiesLower extremities

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1.04 STRUCTURES OF THE MUSCULAR SYSTEM. The Muscular System Comprises nearly half our weight. Over...

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