Lower Extremity- Origin, Insertion, Action, Nerve Supply

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Iliacus- Origin

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  1. Iliac Fossa

  2. Sacrum

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Iliacus- Insertion

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Lesser Trochanter of the Femur

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200 Terms

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Iliacus- Origin

  1. Iliac Fossa

  2. Sacrum

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Iliacus- Insertion

Lesser Trochanter of the Femur

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Iliacus- Action

  1. Flexion of femur at hip joint

  2. Helps maintain posture (integrity of spine)

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Iliacus-Nerve Supply

Femoral nerve (L2-L4)

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Psoas Major- Origin

Transverse processes and bodies of lumbar vertebrae (T12-L5)

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Psoas Major- Insertion

Lesser trochanter of femur

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Psoas Major- Action

  1. Flexion of femur at hip joint

  2. Helps maintain posture (integrity of spine)

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Psoas Major- Nerve Supply

Femoral Nerve

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Psoas Minor- Origin

Bodies/ T12-L1

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Psoas Minor- Insertion

Iliopubic eminence/ Pubis

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Psoas Minor- Action

Flexion of pelvic bone (upward movement)

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Psoas Minor- Nerve Supply

L1 (sometimes L2)

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Sartorius- Origin

Anterior superior iliac spine (ASIS)

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Sartorius- Insertion

Superior Medial shaft of tibia

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Sartorius- Action

  1. Abducts & laterally rotates femur

  2. Medially rotates leg

  3. Assists flexion hip & knee when both are carried out

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Sartorius- Nerve Supply

Femoral nerve

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Rectus Femoris- Origin

  1. Anterior Inferior Iliac Spine

  2. Acetabulum/pelvic bone

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Rectus Femoris- Insertion

Base/Patella

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Rectus Femoris- Action

  1. Extends leg at knee

  2. Flexion at hip

  3. Tonus of muscles play role in strengthening knee

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Rectus Femoris- Nerve Supply

Femoral nerve

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Vastus Lateralis- Origin

  1. Greater trochanter/femur

  2. Intertrochanteric line/femur

  3. Lina aspera/femur

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Vastus Lateralis- Insertion

Base/Patella

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Vastus Lateralis- Action

  1. Extends leg at knee

  2. Tonus of muscles play role in strengthening knee

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Vastus Lateralis- Nerve Supply

Femoral Nerve

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Vastus Medialis- Origin

  1. Linea aspera/femur

  2. Intertrochanteric line/ femur

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Vastus Medialis- Insertions

Base/patella

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Vastus medialis- Action

  1. Extends leg at knee

  2. Tonus of muscles play role in strengthening knee

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Vastus medialis- Nerve Supply

Femoral Nerve

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Vastus Intermedius- Origin

Antero-lateral aspect of femur

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Vastus Intermedius- Insertion

Base/patella

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Vastus Intermedius- Action

  1. Extends leg at knee

  2. Tonus of muscles play role in strengthening knee

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Vastus Intermedius- Nerve Supply

Femoral Nerve

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Gracilis- Origin

  1. Ramus/ischium

  2. Inferior ramus/pubis

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Gracilis-Insertion

Superior medial shaft/tibia

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Gracilis- Action

  1. Flexion/leg

  2. Adducts femur

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Gracilis- Nerve Supply

Obturator Nerve

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Pectineus- origin

superior rami (pubis pectin)/pubis

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Pectineus- insertion

  1. Pectineal line/femur

  2. linea aspera/femur

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Pectineus- action

  1. adducts femur

  2. flexion/femur at hip joint

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Pectineus- nerve supply

Femoral nerve and Obturator nerve

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Adductor Longus- origin

Superior ramus/pubis

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Adductor Longus-insertion

Linea aspera/femur

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Adductor Longus- action

Adducts femur

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Adductor Longus- nerve supply

Obturator nerve

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Adductor Brevis-origin

Inferior ramus/pubis

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Adductor Brevis-insertion

  1. Pectineal line/femur

  2. Linea aspera/femur

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Adductor Brevis-action

Adducts femur

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Adductor Brevis- nerve supply

Obturator nerve

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Adductor Magnus- origin

Rami/ischium & pubis

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Adductor Magnus- insertion

  1. Linea aspera/femur

  2. Adductor tubercle/femur

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Adductor Magnus-action

  1. Adducts femur

  2. Extends femur @ hip joint

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Adductor Magnus- nerve supply

Obturator nerve and Sciatic nerve

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Tensor Fascia Lata- origin

Crest/ilium

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Tensor Fascia Lata-insertion

Iliotibial tract

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Tensor Fascia Lata-action

  1. Flexes, abducts and medially rotates femur

  2. Helps stabilize knee

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Tensor Fascia Lata-nerve supply

Superior Gluteal nerve

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Gluteus Maximus-origin

  1. Posterior gluteal line/ilium

  2. Sacrum &coccyx

  3. Posterior ligaments of SI joint

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Gluteus Maximus-insertion

  1. Gluteal tuberosity/femur

  2. Iliotibial tract

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Gluteus Maximus-action

  1. Extends &laterally rotates femur (for great strength when going form sitting to standing)

  2. Stabilizes knee

  3. Helps stabilize pelvic bone

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Gluteus Maximus-nerve supply

Inferior Gluteal nerve

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Gluteus medius- origin

External surface/ilium (between post and anterior gluteal lines)

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Gluteus medius- insertion

Greater trochanter/femur

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Gluteus medius-action

  1. Abducts femur

  2. Medially rotates femur

  3. Helps steady pelvic bone when opp. foot is raised off ground

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Gluteus medius- nerve supply

Superior Gluteal nerve

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Gluteus Minimus- origin

External surface/ilium (between post and anterior gluteal lines)

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Gluteus Minimus- insertion

Greater trochanter/femur

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Gluteus Minimus-action

  1. Abducts femur

  2. Medially rotates femur

  3. Helps steady pelvic bone when opp. foot is raised off ground

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Gluteus Minimus- nerve supply

Superior Gluteal nerve

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Piriformis- origin

Anterior surface/sacrum

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Piriformis-insertion

Greater trochanter/femur

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Piriformis-action

Laterally rotates femur

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Piriformis- nerve supply

S1, S2

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Superior Gemellus-origin

Spine/ischium

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Superior Gemellus-insertion

Greater trochanter/femur

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Superior Gemellus-action

laterally rotates femur

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Superior Gemellus-nerve supply

L4, L5, S1, S2

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Obturator Internus- origin

Internal surface/obturator membrane

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Obturator Internus- insertion

Greater trochanter/femur

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Obturator Internus- action

laterally rotates femur

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Obturator Internus-nerve supply

L4, L5, S1, S2

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Inferior Gemellus- origin

Ischial tuberosity

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Inferior Gemellus-insertion

Greater trochanter/femur

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Inferior Gemellus-action

laterally rotates femur

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Inferior Gemellus-nerve supply

L4, L5, S1, S2

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Obturator Externus-origin

External surface/obturator membrane

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Obturator Externus- insertion

Trochanteric fossa/femur

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Obturator Externus- action

laterally rotates femur

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Obturator Externus-nerves supply

Obturator nerve

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Quadratus Femoris- origin

Ischial tuberosity

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Quadratus Femoris- insertion

Quadrate tubercle/femur

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Quadratus Femoris- action

laterally rotates femur

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Quadratus Femoris- nerve supply

L4, L5, S1, S2

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Semitendinosus- origin

Ischial tuberosity

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Semitendinosus-insertion

  1. Medial condyle/tibia

  2. Proximal post. shaft/tibia

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Semitendinosus-action

  1. Flexion/leg at knee joint

  2. Stabilize hip

  3. Extend femur

  4. Medially rotates leg

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Semitendinosus- nerve supply

Sciatic nerve

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Semimembranosus- origin

Ischial tuberosity

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Semimembranosus-insertion

Medial condyle/tibia

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Semimembranosus- action

  1. Flexion/leg at knee joint

  2. Stabilize hip

  3. Extend femur

  4. Medially rotates leg

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Semimembranosus- nerve supply

Sciatic nerve