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Muscles
Origin/insertion & actions
43
Anatomy
Undergraduate 1
04/23/2013

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Cards

Term
masseter
Definition
origin: zygomatic arch & maxilla
insertion: mandible
Term
sternocleidomastoid
Definition
origin: sternum & clavicle
insertion: temporal bone & occipital bone
Term
trapezius
Definition
origin: cervical & thoracic vertebrae
insertion: acromion process
Term
deltoid
Definition
origin: clavicle, acromion & spine of scapula
insertion: deltoid tuberosity of humerus
Term
triceps brachii
Definition
origin: glenoid cavity & posterior humerus
insertion: olecranon process of ulna
Term
biceps brachii
Definition
origin: coracoid process
insertion: radial tuberosity
Term
rectus femoris
Definition
origin: iliac spine & acetabulum
insertion: tibial tuberosity & patella
Term
vastus medialis
Definition
origin: greater trochanter
insertion: tibial tuberosity & patella
Term
vastus lateralis
Definition
origin: linea aspera
insertion: tibial tuberosity & patella
Term
vastus intermedius
Definition
origin: anterior & lateral surface of femur
insertion: tibial tuberosity & patella
Term
gluteus medius
Definition
origin: ilium
insertion: greater trochanter of femur
Term
biceps femoris
Definition
origin: ischial tuberosity
insertion: head of fibula, lateral condyle of tibia
Term
semitendinosus
Definition
origin: ischial tuberosity
insertion: upper tibial shaft
Term
semimembranosus
Definition
origin: ischial tuberosity
medial condyle of tibia, lateral condyle of fibula
Term
orbicularis oculi
Definition
action: closes eye
Term
masseter
Definition
action: closes jaw
Term
sternocleidomastoid
Definition
action: flexion of neck forward; rotate head toward shoulder on opposite side
Term
pectoralis major
Definition
action: flexes shoulder
Term
external intercostals
Definition
action: pulls ribs toward one another to elevate ribcage
Term
internal intercostals
Definition
action: draws ribs together to depress ribcage
Term
diaphragm
Definition
action: prime mover of inspiration on contraction
Term
rectus abdominis
Definition
action: flexes & rotates vertebral column
Term
external oblique
Definition
action: compresses abdominal wall; trunk rotation & lateral flexion
Term
internal oblique
Definition
action: compresses abdominal wall; trunk rotation & lateral flexion
Term
transversus abdominis
Definition
action: compresses abdominal contents
Term
latissimus dorsi
Definition
action: extends & abducts shoulder
Term
trapezius
Definition
action: stabilizes scapula
Term
deltoid
Definition
action: abducts shoulder
Term
triceps brachii
Definition
action: extends elbow
Term
biceps brachii
Definition
action: flexes elbow
Term
brachialis
Definition
action: flexes elbow
Term
rectus femoris
Definition
action: extends knee
Term
vastus medialis
Definition
action: extends knee
Term
vastus lateralis
Definition
action: extends knee
Term
vastus intermedius
Definition
action: extends knee
Term
gluteus maximus
Definition
action: extends hip
Term
gluteus medius
Definition
action: abducts & medially rotates hip
Term
biceps femoris
Definition
action: extends hip & flexes knee
Term
semitendinosus
Definition
action: extends hip & flexes knee
Term
semimembranosus
Definition
action: extends hip & flexes knee
Term
gastrocnemius
Definition
action: plantar flexion
Term
soleus
Definition
action: plantar flexion
Term
tibialis anterior
Definition
action: dorsiflexion
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