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LE Origins, Insertions, Actions, and Innervations
origins, insertions, actions, and innervations of the muscles of the lower extremity
132
Anatomy
Undergraduate 4
05/06/2010

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Term
Where does Tibialis Anterior insert?
Definition
medial and plantar aspect of first metatarsal and first cuneiform bone
Term
Where does Tibialis Anterior originate?
Definition
Upper 2/3 of the lateral surface of the tibia
Term
Tibialis Anterior is involved in which actions?
Definition
dorsiflexion and inversion
Term
What nerve innervates Tibialis Anterior?
Definition
deep fibular
Term
Where does Extensor Hallicus Longus originate?
Definition
middle part of fibula on it's medial and anterior aspect and adjacent interosseus membrane
Term
Where does Extensor Hallicus Longus insert?
Definition
dorsum of distal phalanx of great toe
Term
Extensor Hallicus Longus is involved in which actions?
Definition
dorsiflexion, inversion, toe extension
Term
What nerve innervates Extensor Hallicus Longus?
Definition
deep fibular
Term
Where does Extensor Digitorum Longus originate?
Definition
Upper 3/4 of anterior surface of fibula and interosseous membrane and lateral condyle of tibia
Term
Where does Extensor Digitorum Longus insert?
Definition
by four tendons into middle and distal phalanges of four lateral toes
Term
Extensor Digitorum Longus is involved in which actions?
Definition
dorsiflexion, eversion, toe extension
Term
Where does Fibularis Tertius originate?
Definition
lower 1/3 of anterior-lateral surface of fibula
Term
Where does Fibularis Tertius insert?
Definition
base of the dorsum of the fifth metatarsal bone
Term
Fibularis Tertius is involved in which actions?
Definition
dorsiflexion, eversion
Term
Which nerve innervates Extensor Digitorum Longus?
Definition
deep fibular
Term
Which nerve innervates Fibularis Tertius?
Definition
deep fibular
Term
Where does Fibularis Longus originate?
Definition
upper 2/3 of lateral surface of fibula and lateral condyle of tibia
Term
Where does Fibularis Longus insert?
Definition
first metatarsal and first cuneiform
Term
Fibularis Longus is involved in which actions?
Definition
plantar flexion and eversion
Term
What nerve innervates Fibularis Longus?
Definition
superficial fibular
Term
Where does Fibularis Brevis originate?
Definition
lower 2/3 of lateral surface of fibula
Term
Where does Fibularis Brevis insert?
Definition
base of fifth metatarsal bone on lateral side
Term
Fibularis Brevis is involved in which actions?
Definition
plantar flexion and eversion
Term
What nerve innervates Fibularis Brevis?
Definition
superficial fibular
Term
Where does Gastrocnemius originate?
Definition
posterior aspect of medial and lateral condyles of femur
Term
Where does Gastrocnemius insert?
Definition
forms Tendon of Achilles with Soleus and then inserts into calcaneus
Term
Gastrocnemius is invovled in which actions?
Definition
plantar flexion and knee flexion
Term
What nerve innervates Gastrocnemius?
Definition
tibial
Term
Where does Soleus originate?
Definition
posterior upper 1/3 of fibula and soleal line of tibia and interosseous membrane
Term
Where does Soleus insert?
Definition
combines with Gastrocnemius to form Achilles Tendon and then inserts into calcaneous
Term
Soleus is invovled in what actions?
Definition
plantar flexion
Term
What nerve innervates Soleus?
Definition
tibial
Term
Where does Plantaris originate?
Definition
lateral supracondylar ridge of femur
Term
Where does Plantaris insert?
Definition
medial side of posterior part of calcaneus, calcaneal tendon
Term
Plantaris is involved in which actions?
Definition
plantar flexion and knee flexion
Term
What nerve innervates Plantaris?
Definition
tibial
Term
Where does the Tibialis Posterior originate?
Definition
Interosseus membrane and adjacent bony surfaces of posterior tibia and fibula
Term
Where does the Tibialis Posterior insert?
Definition
navicular, cuboid, 1,2,3 cuneiform, 2,3,4 metatarsals
Term
Tibialis Posterior is involved in which actions?
Definition
inversion, plantar flexion
Term
What nerve innervates Tibialis Posterior?
Definition
Tibial
Term
Where does Flexor Digitorum Longus originate?
Definition
middle 3/5 of posterior surface of tibia
Term
Where does Flexor Digitorum Longus insert?
Definition
by four tendons to base of distal phalanges on the plantar surface of the four lateral toes
Term
Flexor Digitorum Longus is involved in which actions?
Definition
toe flexion, inversion, plantar flexion
Term
What nerve innervates Flexor Digitorum Longus?
Definition
Tibial
Term
Where does Flexor Hallicus Longus originate?
Definition
lower 2/3 of posterior surface of fibula and interosseus membrane
Term
Where does Flexor Hallicus Longus insert?
Definition
plantar surface of base of distal phalanx of great toe
Term
Flexor Hallicus Longus is involved in what actions?
Definition
toe flexion, inversion, plantar flexion
Term
What nerve innervates Flexor Hallicus Longus?
Definition
Tibial
Term
Where does Popliteus originate?
Definition
lateral surface of lateral condyle of femur
Term
Where does Popliteus insert?
Definition
triangular space on posterior of tibia above oblique or soleal line
Term
Popliteus in involved in what actions?
Definition
knee flexion and internal rotation
Term
What nerve innervates Popliteus?
Definition
Tibial
Term
Where does Semimembranosus originate?
Definition
tuberosity of ischium (upper and lateral facet)
Term
Where does Semimembranosus insert?
Definition
posterior aspect of medial condyle of tibia
Term
Semimembranosus is involved in what actions?
Definition
hip extension, knee flexion, knee internal rotation
Term
What nerve innervates Semimembranosus?
Definition
sciatic- tibial portion
Term
Where does Semitendinosus originate?
Definition
tuberosity of ischium (inferomedial) with the long head of the biceps femoris
Term
Where does Semitendinosus insert?
Definition
beside gracilis and sartorius on medial tibia, where shaft and head join (pes anserine)
Term
Semitendinosus is involved in what actions?
Definition
hip extension, knee flexion, knee internal rotation
Term
What nerve innervates Semitendinosus?
Definition
sciatic- tibial portion
Term
Where does Biceps Femoris originate?
Definition
long head from tuberosity of ischium and sacrotuberous ligament. Short head from lateral lip of linea aspera b/w adductor magnus and vastus lateralis
Term
Where does Biceps Femoris insert?
Definition
head of fibula
Term
Biceps Femoris is invovled in what actions?
Definition
hip extension, knee flexion, knee external rotation
Term
What nerve innervates Biceps Femoris?
Definition
Sciatic- tibial portion
Term
Where does Vastus Medialis originate?
Definition
medial lip of linea aspera
Term
Where does Vastus Medialis insert?
Definition
tibial tuberosity via quadriceps tendon
Term
Vastus Medialis is involved in what actions?
Definition
knee extension
Term
What nerve innervates Vastus Medialis?
Definition
femoral
Term
Where does Vastus Intermedius originate?
Definition
proximal 2/3 anteriolateral surface of femur
Term
Where does Vastus Intermedius insert?
Definition
deep surface of quadriceps tendon to the tibial tuberosity
Term
Vastus Intermedius is involved in what actions?
Definition
knee extension
Term
What nerve innervates Vastus Intermedius?
Definition
femoral
Term
Where does Vastus Lateralis originate?
Definition
lateral lip of linea aspera
Term
Where does Vastus Lateralis insert?
Definition
tibial tuberosity via quadriceps tendon
Term
Vastus Lateralis is involved in what actions?
Definition
knee extension
Term
What nerve innervates Vastus Lateralis?
Definition
femoral
Term
Where does Rectus Femoris originate?
Definition
anterior inferior iliac spine (AIIS) and superior rim of acetabulum
Term
Where does Rectus Femoris insert?
Definition
superficial central portion of the base of the patella to the tibial tuberosity via the quadriceps tendon
Term
Rectus Femoris is involved in what actions?
Definition
hip flexion, knee extension
Term
What nerve innervates Rectus Femoris?
Definition
femoral
Term
Where does Psoas Major originate?
Definition
from the bodies, transverse processes, and discs of last thoracic and all five lumbar vertebrae
Term
Where does Psoas Major insert?
Definition
lesser trochanter of femur
Term
Psoas Major is involved in what actions?
Definition
hip flexion and external rotation
Term
What nerve innervates Psoas Major?
Definition
2nd and 3rd lumbar
Term
Where does Psoas Minor originate?
Definition
sides of the bodies of T12 and L1, and the disc between
Term
Where does Psoas Minor insert?
Definition
pectineal line and iliopectineal eminence
Term
Psoas Minor is involved in what actions?
Definition
Flexion of the pelvis and lumbar spine
Term
What nerve innervates Psoas Minor?
Definition
L1 2
Term
Where does Illiacus originate?
Definition
superior 2/3 of iliac fossa, iliac crest, and ala of sacrum
Term
Where does Illiacus insert?
Definition
lesser trochanter of femur
Term
Illiacus is involved in what actions?
Definition
hip flexion and external rotation
Term
What nerve innervates Illiacus?
Definition
branch of femoral
Term
Where does Sartorius originate?
Definition
anterior superior illiac spine and notch inferior
Term
Where does Sartorius insert?
Definition
medial aspect of tibia at junction of head and shaft (medial to tuberosity)
Term
Sartorius is involved in what actions?
Definition
hip flexion, hip abduction and hip external rotation, knee flexion, and knee internal rotation
Term
Which nerve innervates Sartorius?
Definition
Femoral
Term
Where does Pectineus originate?
Definition
pectineal line of pubis between iliopectineal eminence and pubic tubercle
Term
Where does Pectineus insert?
Definition
line from lesser trochanter to linea aspera (pectineal line)
Term
Pectineus is involved in what actions?
Definition
thigh adduction, flexion, and slight internal rotation
Term
What nerve innervates Pectineus?
Definition
femoral and accessory obturator
Term
Where does Tensor Fasciae Latae originate?
Definition
lateral aspect of anterior superior iliac crest
Term
Where does Tensor Fasciae Latae insert?
Definition
fascia lata about halfway down thigh, down to Gerdy's tubercle on the tibia via the iliotibial tract
Term
Tensor Fascia Latae is involved in what actions?
Definition
tenses fascia latae. Hip flexion, abduction, and internal rotation
Term
What nerve innervates Tensor Fascia Latae?
Definition
superior gluteal
Term
Where does Gluteus Minimus originate?
Definition
external surface of ilium between inferior and anterior gluteal lines
Term
Where does Gluteus Minimus insert?
Definition
anterior aspect of greater trochanter
Term
Gluteus Minimus is involved in what actions?
Definition
hip internal rotation
Term
What nerve innervates Gluteus Minimus?
Definition
superior gluteal
Term
Where does Gluteus Medius originate?
Definition
external surface of ilium between iliac crest and posterior gluteal line and anterior gluteal line
Term
Where does Gluteus Medius insert?
Definition
external surface of greater trochanter
Term
Gluteus Medius is involved in what actions?
Definition
abducts hip, rotates thigh internally when leg is extended, stabilization of opposite hip
Term
What nerve innervates Gluteus Medius?
Definition
superior gluteal
Term
Where does Gluteus Maximus originate?
Definition
posterior fourth of crest of ilium; posterior surface of sacrum and coccyx. External surface of ilium between crest and posterior gluteal line. Sacrotuberous ligament
Term
Where does Gluteus Maximus insert?
Definition
gluteal tuberosity and iliotibial tract
Term
Gluteus Maximus is involved in what actions?
Definition
extends hip, assists in adduction and external rotation
Term
What nerve innervates Gluteus Maximus?
Definition
inferior gluteal
Term
Where does Gracilis originate?
Definition
lateral on inferior ramus of pubis and ischium
Term
Where does Gracilis insert?
Definition
on medial surface of tibia, beside sartorius and semitendinosus where shaft and head join
Term
Gracilis is involved in what actions?
Definition
knee flexion and internal rotation, hip adduction
Term
What nerve innervates Gracilis?
Definition
obturator
Term
Where does Adductor Brevis originate?
Definition
lateral surface of inferior ramus of pubis
Term
Where does Adductor Brevis insert?
Definition
upper third of linea aspera
Term
Adductor Brevis is involved in what actions?
Definition
hip adduction, slight medial rotation, extension, flexion
Term
What nerve innervates Adductor Brevis?
Definition
obturator
Term
Where does Adductor Longus originate?
Definition
body of pubis
Term
Where does Adductor Longus insert?
Definition
middle half of medial lip of linea aspera
Term
Adductor Longus is involved in what actions?
Definition
hip adduction, slight internal rotation, extension, flexion
Term
What nerve innervates Adductor Longus?
Definition
Obturator
Term
Where does Adductor Magnus originate?
Definition
external surface of ischial tuberosity and inferior rami of ischium and pubis
Term
Where does Adductor Magnus insert?
Definition
entire length of linea aspera; medial supracondylar ridge of femur, and adductor tubercle
Term
Adductor Magnus is invovled in what actions?
Definition
hip adduction, external rotation, extension (lower portion), flexion (upper portion)
Term
What nerve innervates Adductor Magnus?
Definition
obturator and sciatic
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