Muscular System

Major FunctionsMajor Functions

There are over 600 muscles in the human body.

Structure of Muscle

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The Anatomy of Skeletal MuscleThe Anatomy of Skeletal Muscle

Muscle fibre looking outward: Perimysium

Epimysium

Muscle fibre looking inward: Endomysium

Sarcolemma

Myofibrils

Muscle fibre

Muscle belly

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The Sliding Filament TheoryThe Sliding Filament Theory

The Sliding Filament TheoryThe Sliding Filament Theory

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How Muscles Are NamedHow Muscles Are Named

Action/Function

Direction of Fibres

Location

Number of Divisions/Heads

Shape

Points of Attachment

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Antagonistic PairsAntagonistic Pairs

ExamplesAgonist (Prime Mover) Antagonist

(Counteracts)

Elbow flexion Biceps brachii

Shoulder abduction Deltoid

Medial shoulder rotation

Pectoralis major

Knee extension Quadriceps

Wrist flexion Flexor carpi radialis

Dorsi flexion Tibialis anterior

Trunk flexion Rectus abdominis

Hip flexion Iliopsoas

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Anterior MusclesAnterior Muscles

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Posterior MusclesPosterior Muscles

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Muscles of the NeckMuscles of the Neck

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Muscles of the AbdomenMuscles of the Abdomen

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Muscles of the Rotator CuffMuscles of the Rotator Cuff

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Elbow Flexors / Extensors – PosteriorElbow Flexors / Extensors – Posterior

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Elbow Flexors / Extensors – AnteriorElbow Flexors / Extensors – Anterior

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Muscles of the Forearm – AnteriorMuscles of the Forearm – Anterior

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Extrinsic Hand Muscles – PosteriorExtrinsic Hand Muscles – Posterior

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Muscles of the Thigh – PosteriorMuscles of the Thigh – Posterior

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Muscles of the Thigh – PosteriorMuscles of the Thigh – Posterior

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Extrinsic Foot Muscles – AnteriorExtrinsic Foot Muscles – Anterior

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Extrinsic Foot Muscles – PosteriorExtrinsic Foot Muscles – Posterior

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Muscle Contraction During ExerciseMuscle Contraction During Exercise

Isotonic exercise

Isometric exercise

Isokinetic exercise

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