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Muscle Anatomy & Physiology Flashcards

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  • Origin of Orbicularis Oculi
    Frontal bone, maxilla (medial margin of orbit)
  • Action of Orbicularis Oculi
    Closes eyelids
  • Origin of Orbicularis Oris
    Lateral fibers - zygomatic bone of maxilla; medial fibers - medial maxilla and mandible
  • Action of Orbicularis Oris
    Closes and protrudes lips
  • Origin of Platysma
    Subcutaneous fascia of upper chest and shoulder
  • Action of Platysma
    Depresses and draws lower lip laterally; tenses skin of neck
  • Origin of Sternocleidomastoideus
    Manubrium of sternum and medial clavicle
  • Action of Sternocleidomastoideus
    Flexes neck; rotates head to opposite side
  • Origin of Pectoralis Major
    Medial half of clavicle, sternum, costal cartilages of upper ribs
  • Action of Pectoralis Major
    Adducts the arm; flexes arm; rotates arm medially
  • Origin of Serratus Anterior
    Outer surfaces and superior borders of upper 8 or 9 ribs
  • Action of Serratus Anterior
    Draws scapula forward and upward; rotates scapula
  • Origin of Obliquus Externus Abdominis
    Lower eight ribs
  • Action of Obliquus Externus Abdominis
    Compresses abdominal contents; flexes and rotates vertebral column
  • Origin of Rectus Abdominis
    Crest of pubis; pubic symphysis
  • Action of Rectus Abdominis
    Flexes vertebral column; compresses abdominal contents
  • Origin of Trapezius
    Medial third of superior nuchal line; external occipital protuberance; spinous processes of C7-T12
  • Action of Trapezius
    Elevates, depresses, and rotates scapula; extends neck
  • Origin of Latissimus Dorsi
    Spinous processes of lower thoracic vertebrae, lumbar vertebrae, iliac crest
  • Action of Latissimus Dorsi
    Extends, adducts, and medially rotates arm
  • Origin of Deltoideus
    Anterior border and upper surface of lateral third of clavicle; acromion and spine of scapula
  • Action of Deltoideus
    Abducts arm; anterior fibers flex and medially rotate arm; posterior fibers extend and laterally rotate arm
  • Origin of Biceps Brachii
    Long head - supraglenoid tubercle; short head - coracoid process of scapula
  • Action of Biceps Brachii
    Flexes forearm; supinates forearm
  • Origin of Triceps Brachii
    Long head - infraglenoid tubercle; lateral and medial heads - posterior surface of humerus
  • Action of Triceps Brachii
    Extends forearm
  • Origin of Flexor Digitorum Superficialis
    Medial epicondyle of humerus; coronoid process of ulna; radius
  • Action of Flexor Digitorum Superficialis
    Flexes middle phalanges of fingers
  • Origin of Gluteus Maximus
    Outer surface of ilium, sacrum, and coccyx
  • Action of Gluteus Maximus
    Extends and laterally rotates thigh
  • Origin of Rectus Femoris
    Anterior inferior iliac spine and superior margin of acetabulum
  • Action of Rectus Femoris
    Extends leg; flexes thigh
  • Origin of Vastus Medialis
    Intertrochanteric line and medial lip of linea aspera of femur
  • Action of Vastus Medialis
    Extends leg
  • Origin of Vastus Intermedius
    Anterior and lateral surfaces of femur
  • Action of Vastus Intermedius
    Extends leg
  • Origin of Biceps Femoris
    Long head - ischial tuberosity; short head - linea aspera of femur
  • Action of Biceps Femoris
    Flexes leg; extends thigh
  • Origin of Semitendinosus
    Ischial tuberosity
  • Action of Semitendinosus
    Flexes leg; extends thigh
  • Origin of Extensor Digitorum Longus
    Lateral condyle of tibia; anterior surface of fibula
  • Action of Extensor Digitorum Longus
    Extends toes; dorsiflexes foot
  • Origin of Peroneus Longus
    Upper two-thirds of lateral surface of fibula
  • Action of Peroneus Longus
    Plantar flexes and everts foot