Major Muscles of the Human Body anterior and posterior view

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Major Muscles of the Human Body ( anterior and
posterior view)
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Human Muscular Systemanterior view
quadriceps
biceps
deltoid
abdominals
sternocleidomastoid
pectorals (chest muscle)
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Human Muscular Systemposterior view
latissimus dorsi
gluteals
gastrocnemius
Achilles tendon
trapezius
Hamstring (biceps femori)
triceps
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Skeletal Muscles

• Long, thin, and striped (striated)
• Continuous control (voluntary)
• Tendons
• Attached to bone at the periostium
• multinucleated

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Smooth Muscle

• Fibers are organized
• Found inside the body
• Works automatically
• (cant control your smooth muscle)
• Necessary for survival

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Cardiac Muscle

• Only in heart
• Contain many mitochondria
• By age 70 heart contracts 2.5 billion times
  (assume resting heart beat).
• involuntary

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Muscular Disorders

• Muscle pull or strain
• Tearing a muscle fiber(s), followed by bleeding
  or swelling of muscle
• Muscle cramp
• Prolonged contraction of muscle, ion imbalance

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Cont.

• Tendonitis
• Swelling of the tendons due to sharp twist or
  pull, over use
• Muscular Dystrophy
• Inherited disease in which muscle cells break
  down, gradual weakening of muscles, lose ability
  to contract

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Quadriceps muscle(rectus femoris)
Origin pelvis - attachment to stationary
bone
Note the origin and insertion of this muscle
belly
tendon
Insertion femur - attachment to moveable
bone
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Muscle Terms

• Tendon
• Long connective tissue cord
• Actin and myosin
• Muscle proteins
• Origin
• Attachment to stationary part of bone
• Insertion
• Attachment to moveable part of bone
• Flexion
• Movement that reduces a joint angle
• Extension
• A movement that increases a joint angle

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Movements of the body

• Extension Flexion

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Muscle Belly to Sarcomere

• Muscle Belly
• Bundle of muscle fibers
• Muscle Fiber (cell)
• Bundle of myofibrils
• Myofibril
• Made up of units called sarcomeres
• Sarcomere
• Made up of muscle proteins
• actin and myosin

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Antagonistic muscle pairs(one contracts while
the other relaxes)