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Details

A&P Muscle Lab
Actions, Origins & Insertions
48
Anatomy
Not Applicable
12/07/2009

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Cards

Term
Platysma
Definition
action: depresses mandible, pulls down lower lip, tenses neck skin
Term
Orbicularis Oculli
Definition
Action: contracts individually around the eye (blinking, winking, squinting)
Term
Orbicularis Oris
Definition
Action: closes, purses & protrudes the lips
Term
Temporalis
Definition
closes jaws by elevating mandible
Term
Masseter
Definition
Action: agonist in elevating the mandible
Term
Buccinator
Definition
Action: retraction of the mandible
Term
Digastric
Definition
Action: open mouth, depress mandible, elevate hyoid bone
Term
Mylohyoid
Definition
Action: elevates hyoid bone & floor of mouth, enabling tongue to exert upper & backward pressure
Term
Sternocleidomastoid
Definition
head & neck flexion; rotation of the head
Term
Trapezius
Definition
Action: elevate, depress and rotate scapula
Term
Deltoid
Definition
Action: agonist in arm abduction, flexion & medial rotation of humerus
Term
Pectoralis Major
Definition
Action: agonist in arm flexion, adducts arm, rotates arm medially
Term
Serratus Anterior
Definition
Action: prime mover to protract scapula, abduction & raising of arm (punching)
Term
Supraspinatus
Definition
Action: abduction of arm, stabilizes shoulder
Term
Infraspinatus
Definition
Action: rotates humerus laterally, stabilizes shoulder
Term
Teres Major
Definition
Action: medially rotates and adducts the humerus; synergist of latissimus dorsi
Term
External Intercostals
Definition
Action: elevates rib cage during inhalation
Term
Internal Intercostals
Definition
Action: depresses rib cage during exhalation
Term
External Oblique
Definition
Action: aids in flexion of the vertebral column; trunk rotation
Term
Internal Oblique
Definition
Action: aids in flexion of the vertebral column; trunk rotation
Term
Transversus Abdominus
Definition
Action: Compresses abdomen
Term
Rectus Abdominus
Definition
Action: flex and rotate lumbar region
Term
Latissimus Dorsi
Definition
Action: adducts and extends arm; depresses scapula
Term
Diaphragm
Definition
Action: agonist of inspiration; flattens to increase thoracic volume
Term
Biceps Brachii
Definition
Action: elbow flexion; supination of forearm
Term
Triceps Brachii
Definition
Action: agonist in forearm extension
Term
Brachialis
Definition
Action: flexor or forearm
Term
Flexor Digitorum Superficialis
Definition
Action: flexor or wrist and middle phalanges
Term
Flexor Carpi Radialis
Definition
Action: wrist flexion; abduction of hand
Term
Brachioradialis
Definition
Action: synergist in forearm flexion
Term
Pronator Teres
Definition
Action: pronates forearm
Term
Supinator
Definition
Action: supinates forearm
Term
Extensor carpi radialis longus
Definition
Action: extends & abducts wrist
Term
Extensor Digitorum
Definition
Action: agonist of finger extension; abducts fingers; extends wrist
Term
Rectus Femoris
Definition
Action: extends knee; flexion of thigh at the hip
Term
Vastus Lateralis
Definition
Action: Extends & stabilizes the knee
Term
Vastus Medialis
Definition
Action: extends knee; stabilizes the patella
Term
Sartorius
Definition
Action: flexes, abducts & laterally rotates the thigh
Term
Adductor Magnus
Definition
Action: synergist of hamstring in extension, adducts & medially rotates & flexes thigh
Term
Adductor Longus
Definition
Action: adducts, flexes & medially rotates the thigh
Term
Gracilis
Definition
Action: adducts, flexes and medially rotates the thigh, aids in knee flexion
Term
Gluteus Maximus
Definition
Action: thigh extensor; laterally rotates and abducts the thigh
Term
Biceps Femoris
Definition
Action: extends thigh; flexes knee; lateral rotation of the leg
Term
Semimembranosus
Definition
Action: thigh extesion; knee flexion; medial leg rotation
Term
Semitendinosus
Definition
Action: extends thigh, flexes knee, medial rotation of leg
Term
Soleus
Definition
Action: plantar flexion
Term
Gastrocnemius
Definition
Action: plantar flexion
Term
Tibialis Anterior
Definition
Action: agonist in dorsiflexion; inversion of the foot
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