Anatomy Ch6 - The muscular system

muscles, origins, insertions, etc
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sternocleidomastoid
origin: sternum and clavicle
insertion: mastoid process of temporal bone
location: side of neck
action: flexion of head at neck
masseter
origin: maxilla and zygomatic arch of temporal bone
insertion: side of mandible
location: jaw
action: elevates and protracts mandible
trapezius
origin: occipital bone, spinous process of cervical and thoracic vert
insertion:clavicle, spine and acromion process of scapula
location: upper back
action: elevate shoulder, adducts arm, rotate scapula
pectoralis major
origin: clavicle, sternum, costal cartilage of 2-6 ribs
insertion: greater tubercle of humerous
location: upper part of chest (pecs)
action: flexes,adducts, and rotates arm medialy
latissimus dorsi
origin: sacrum, spinous process of thoracic and lumbar vert, illiac crest, lower ribs
insertion: humerous (armpit area)
location: lower back (lats)
action: extends, adducts, rotates arm at shoulder medialy, draws arm downward and backward
deltoid
origin: lateral end of clavicle and acromion process and spine of scapula
insertion: deltiod tuberosity of humerous
location: forms rounded shape of shoulder
action: abducts, flexes, extends, and rotates arm at shoulder
bicepts brachii
origin: above glenoid cavity of scapula and corocoid process of scapula
insertion: radial tuberosity of radius
location: anterior upper arm
action: flexes forearm at elbow and rotates hand and flexes arm at shoulder
tricepts brachii
origin: below glenoid cavity of scapula and lateral, medial, posterior humerous
insertion: olecranon of ulna (elbow)
location: posterior upper arm
action: extends forearm at elbow and extends arm at shoulder
flexors
origin: medial epichondyle of humerous
insertion: carpals, metacarpals, phalanges (anterior)
location: anterior forearm
action: flex, abduct, adduct wrist, and flex fingers
extensors
origin: lateral epichondyle of humerous
insertion: metacarpals, phalanges (posterior)
location: posterior forearm
action: extend, abduct, adduct wrist, and extend fingers
external obliques
origin: outside of lower 8 ribs
insertion: illiac crest of coxal bone
location: lateral sides of abdomin
action: comress abdomen, bent vertebral col, rotation at waist
rectus abdominus
origin: pubis and syphysis pubis of coxal bone
insertion: cartilage of 5-7 ribs, ziphoid process of stern
location: medial abdomin
action: compress abdomen, flexion at waist
gluteus maximus
origin: illiac crest, sacrum, coccyx
insertion: posterior femur
location: booty area
action: extends and rotates thigh laterally at hip
gluteus medius
origin: illium
insertion: greater trochanter of femur
location: posterior waist
action: abducts and rotate thigh medially at hip
adductor magnus
origin: pubis, symphysis pubis,and ischium of coxal bone
insertion: linea aspera of femur
location: inner thigh
action: adducts, rotates thigh medially, flexes thigh at hip
gracilis
origin: pubis, symphysis pubis of coxal bone
insertion: medial surface of tibia
location: lower inner thigh
action: adducts thigh, flexes leg groin at hip
bicep femoris
origin: ishium of coxal bone, linea aspera of femur
insertion: head of fibula, lateral chondyle of tibia
location: posterior upper leg (hammy)
action: flex leg at knee, extends thigh at hip
semiteninosus
origin: ischium of coxal bone
insertion: medial surface of tibia
location: posterior lateral upper leg (hammy)
action: flex leg at knee, extends thigh at hip
semimembranosus
origin: ischium of coxal bone
insertion: medial chondyle of tibia
location: posterior medial upper leg (hammy)
action: flex leg at knee, extends thigh at hip
sartorious
origin: anterior, superior illum of coxal bone
insertion: medial surface of tibia
location: anterior, crosses upper leg
action: flex leg at knee, flex thigh at hip, rotate thigh laterally, crosses legs
rectus femoris
origin: anterior inferior spine of illium of coxal bone
insertion: patella by tendon, patellar lig to tibial tuberosity
location: anterior upper leg, big middle one (quad)
action: extend leg at knee, flex thigh at hip
vastus lateralis
origin: greater trochanter of femur, linea aspera of femur
insertion: patella by tendon, patellar lig to tibial tuberosity
location: anterior upper leg, lateral (quad)
action: extend leg at knee, flex thigh at hip
vastus medialis
origin: linea aspera of femur
insertion: patella by tendon, patellar lig to tibial tuberosity
location: anterior upper leg, medial (quad)
action: extend leg at knee, flex thigh at hip
vastus intermedius
origin: anterior and lateral surface of femur
insertion: patella by tendon, patellar lig to tibial tuberosity
location: anterior upper leg, deep (quad)
action: extend leg at knee, flex thigh at hip
tibialis anterior
origin: lateral chondyle of tibia
insertion: 1st tarsal and 1st metatarsal
location: anterior lower leg, lateral (shin)
action: dorsiflexion and inversion of foot
gastrocnemeus
origin: lateral and medial chondyles of femur
insertion: calcaneus by achilles tendon
location: posterior lower leg (calf)
action: plantar flexion of foot and flex leg at knee
soleus
origin: head of fibula, medial tibia
insertion: calcaneus by achilles tendon
location: posterior lower leg
action: plantar flexion of foot
peroneus longus
origin: head and shaft of fibula, lateral chondyle of tibia
insertion: 1st tarsal and 1st metatarsal
location: posterior lower leg, lateral
action: plantar flexion of foot, eversion of foot
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