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A&P I -- Muscles

Origin, Insertion, Action

Muscle NameOriginInsertionAction
platysma fascia of chest mandible, corner of mouth tenses neck, pull down lower lip
scalenes transverse process of cervical vertebrae first two ribs elevate first two ribs (inspiration), flex and rotate neck
trapezius occipital bone, vertebrae clavicle, scapula rotate scapula
latissimus dorsi spines of vertebrae, iliac crest humerus extend, rotate arm
pectoralis major clavicle, sternum humerus flex, adduct humerus
serratus anterior upper ribs scapula pull scapula anterior and down
deltoid scapula, clavicle deltoid tuberosity on humerus adduct, extend, flex arm
triceps brachii scapula, humerus olecranon process of ulna extend forearm
biceps brachii scapula radial tuberosity of radius flex forearm
brachioradialis distal lateral humerus radius flex forearm at elbow
flexors anterior forearm flex hand and wrist
extensors posterior forearm extend hand and wrist
external oblique lower ribs iliac crest compress abdomen, flex laterally
rectus abdominus pubic symphysis xiphoid process of sternum compress, flex trunk
internal oblique iliac crest lower ribs compress abdomen, flex laterally
sartorius anterior superior iliac crest (ASIS) medial tibia flex, adduct, rotate thigh
gracilis pubic symphysis tibia adduct thigh
soleus fibula, posterior tibia calcaneus plantar flexion
gastrocnemius condyles of femur calcaneus plantar flexion
tibialis anterior lateral condyle of tibia tarsals dorsiflexion, inversion of foot
gluteus maximus sacrum coccyx, ilium femur major extensor of thigh
adductor brevis pubis posterior femur adduct and rotate thigh
adductor magnus pubis posterior femur adduct and rotate thigh
adductor longus pubis posterior femur adduct and rotate thigh
zygomaticus major/minor zygomatic bone corner of mouth "smile"; raises corners of mouth
masseter zygomatic arch and bone angle and ramus of mandible prime mover of jaw closure
sternocleidomastoid sternum, clavicle temporal, occipital bone rotate head
orbicularis oculi frontal bone, maxilla eyelid closes eye
temporalis temporal fossa coronoid process of mandible close jaw
rhomboids neck/spine scapula stabilize scapula
teres major posterior scapula humerus rotate humerus laterally
brachialis front of distal humerus coronoid process of ulna major forearm flexor
supraspinatous supraspinous fossa of scapula greater tubercle of humerus initiates abduction, stabilize shoulder
infraspinatous infraspinous fossa of scapula greater tubercle of humerus rotates humerus laterally
iliopsoas sacrum, lower spine lesser trochanter of femur flex thigh, or flex trunk on thigh
pectineus pubis lesser trochanter of femur adduct, flex, medially rotate thigh
tensor fasciae latae iliac crest/iliac spine iliotibial tract steadies knee
biceps femoris ischial tuberosity, distal femur head of fibula, lateral condyle of tibia extends thigh and flexes knee
semimembranosus ischial tuberosity medial condyle of tibia extend thigh and flex knee
semitendinosus ischial tuberosity medial upper tibia extend thigh and flex knee
vastus intermedius anterior lateral shaft of femur patella/patellar ligament extend knee
vastus medialis linea aspera patellar ligament extend knee
vastus lateralis greater trochanter/linea aspera patellar ligament extend and stabilize knee
rectus femoris anterior inferior iliac spine/acetabulum patellar ligament extend knee, flex thigh at hip
fibularis longus head, upper portion of fibula via long tendon to metatarsal plantar flexion and eversion of foot
erector spinae ribs cervical vertebrae prime mover of back extension
digastric mandible, mastoid process of temporal bone hyoid bone via connective tissue open mouth
orbicularis oris maxilla, mandible encircle mouth close lips
Created by: pearljen