Major muscles of the human body anterior and posterior view
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Major Muscles of the Human Body ( anterior and posterior view). Human Muscular System “anterior view”. quadriceps. biceps . deltoid. abdominals. sternocleidomastoid. pectorals (chest muscle). Human Muscular System “posterior view”. latissimus dorsi. gluteals. gastrocnemius.

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Major muscles of the human body anterior and posterior view
Major Muscles of the Human Body ( anterior and posterior view)


Human muscular system anterior view
Human Muscular System“anterior view”

quadriceps

biceps

deltoid

abdominals

sternocleidomastoid

pectorals (chest muscle)


Human muscular system posterior view
Human Muscular System“posterior view”

latissimus dorsi

gluteals

gastrocnemius

Achilles tendon

trapezius

Hamstring (biceps femori)

triceps


Skeletal muscles
Skeletal Muscles

  • Long, thin, and striped (striated)

  • Continuous control (voluntary)

  • Tendons

    • Attached to bone at the periostium

  • multinucleated


Smooth muscle
Smooth Muscle

  • Fibers are organized

  • Found inside the body

  • Works automatically

    • (can’t control your smooth muscle)

  • Necessary for survival


Cardiac muscle
Cardiac Muscle

  • Only in heart

  • Contain many mitochondria

  • By age 70 heart contracts 2.5 billion times (assume resting heart beat).

  • involuntary


Muscular disorders
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


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


Quadriceps muscle rectus femoris
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


Muscle terms
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


Movements of the body
Movements of the body

  • Extension Flexion


Muscle belly to sarcomere
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


Antagonistic muscle pairs one contracts while the other relaxes
Antagonistic muscle pairs(one contracts while the other relaxes)


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