muscles in the lower extremities

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physci 107

28 Terms

1
<p>iliopsoas ( iliacus + psoas)</p>

iliopsoas ( iliacus + psoas)

Origin: psoas major: transverse process/bodies of lumbar vertebrae; iliacus: iliac fossa

Insertion: Lesser trochanter

Action: flex hip/torso (more so the psoas major)

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2
<p>gluteus maximuis</p>

gluteus maximuis

origin: ilium, sacrum, coccyx

insertion: gluteal tuberosity of femur

action: extend, abduct, laterally rotate thigh

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3
<p>gluteus medius</p>

gluteus medius

origin: ilium

insertion: greater trochanter of femur

action: abduct, medial rotation of thigh

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4
<p>gluteus minimus</p>

gluteus minimus

origin: ilium

insertion: greater trochanter of femur

action: abduct, medial rotation of thigh

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5
<p>piriformis</p>

piriformis

under gluteus minimus

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6
<p>tensor fasciae latae and iliotibial band</p>

tensor fasciae latae and iliotibial band

lateral side of thigh

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7
<p>rectus femoris</p>

rectus femoris

origin: anterior inferior iliac spine

insertion: tibial tuberosity via patellar tendon

action: extend knee, flex hip

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8
<p>vastus lateralis</p>

vastus lateralis

origin: linea aspera

insertion: tibial tuberosity via patellar tendon

action: extend knee

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9
<p>vastus medialis</p>

vastus medialis

origin: linea aspera

insertion: tibial tuberosity via patellar tendon

action: extend knee

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10
<p>vastus intermedius</p>

vastus intermedius

origin: anterior femur

insertion: tibial tuberosity via the patellar tendon

action: extend knee

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11
<p>sartorius</p>

sartorius

origin: anterior superior iliac spine

insertion: medial proximal tibia

action: flex hip/knee, abduct hip, lateral rotation of thigh

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12
<p>gracilis</p>

gracilis

origin: inferior ramus of pubis

insertion: medial proximal tibia

action: adduct thigh, flex knee

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13
<p>adductor longus</p>

adductor longus

origin: pubis

insertion: linea aspera

action: adduct/flex thigh, medial rotate thigh

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14
<p>adductor magnus</p>

adductor magnus

origin: ischial tuberosity, ischial/pubis rami

insertion: linea aspera, medial supracondylar line, adductor tubercle

action: adduct/flex/extend/medial rotate thigh

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15
<p>biceps femoris (long head and short head)</p>

biceps femoris (long head and short head)

origin: short head: linea aspera, long head: ischial tuberosity

insertion: head of fibula, proximal lateral tibia

action: flex knee, extend thigh (long head)

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16
<p>semitendonosus</p>

semitendonosus

Origin: ischial tuberosity

insertion: proximal medial tibia

action: flex knee, extend thigh

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17
<p>semimembranosus</p>

semimembranosus

origin: ischial tuberosity

insertion: proximal medial tibia
action: flex knee, extend thigh

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18
<p>gastrocnemius</p>

gastrocnemius

origin: medial/lateral condyle of femur

insertion: calcaneal tuberosity via calcaneal tendon

action: plantar flexion, flex knee

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19
<p>soleus</p>

soleus

origin: superior tibia, fibula, interouseous membrane

insertion: calcaneal tuberosity via calcaneal tendon

action: plantar flexion

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20
<p>tibialis posterior</p>

tibialis posterior

deep to soleus

action: inversion/plantar flexion of foot

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21
<p>tibialis anterior</p>

tibialis anterior

action inversion/dorsiflexion of foot

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22
<p>fibularis (longus and brevis)</p>

fibularis (longus and brevis)

action: eversion/ plantar flexion of foot

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23
<p>temporalis</p>

temporalis

origin: temporal fossa

insertion: coronoid process of mandible

action: elevates mandible

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24
<p>masseter</p>

masseter

origin: zygomatic arch

insertion: angle/ramus of mandible

action: elevate mandible, work to move mandible medio-laterally

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25
<p>external oblique</p>

external oblique

action: trunk flexion, rotate, lateral flexion

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26
<p>internal oblique</p>

internal oblique

action: trunk flexion, rotate, lateral flexion

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27
<p>transverse abdominis</p>

transverse abdominis

action: compress viscera

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28
<p>rectus abdominis and linea alba</p>

rectus abdominis and linea alba

action: flex trunk

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