Thigh/Buttock Muscles Flashcards by Katy Griffith

quadratus lumborum - origin (DA)

posteromedial iliac crest, iliolumbar ligament

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quadratus lumborum - insertion (PA)

12th rib along medial 1/2 of lower border, TPs of T12-L4

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quadratus lumborum - innervation

ventral rami T12-L3

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quadratus lumborum - actions

stabilizes 12th rib and lumbar spin, ipsilateral SB, bilateral extension, hikes hip

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psoas major - origin (DA)

TPs, vertebral bodies and adjoining discs of T12-L5

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psoas major - insertion (PA)

lesser trochanter

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psoas major - innervation

ventral rami L1-L3(4)

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psoas major - actions

hip flexion, hip external rotation, trunk ipsilateral sidebend, spinal flexion during sit ups, spinal stabilization

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iliacus - origin (DA)

superior 2/3 of iliac fossa, anterior SI ligaments

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iliacus - insertion (PA)

less trochanter of femur

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iliacus - innervation

femoral nerve L2-L3

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iliacus - actions

flexes hip, externally rotates the flexed hip

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tensor fascia latae - origin (DA)

anterior iliac crest, lateral surface of ASIS, and a portion of the border of the notch below it

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tensor fascia latae - insertion (PA)

iliotibial band and hence to the lateral tibial condyle at Gerdy’s tubercle of tibia

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tensor fascia latae - innervation

superior gluteal nerve L4, 5, S1

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tensor fascia latae - actions

extension and external rotation of the knee; flexion, abduction and internal rotation of the hip; dynamic stabilizer of the knee joint

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sartorius - origin (DA)

ASIS

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sartorius - insertion (PA)

proximal medial surface of tibia at pes anserine

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sartorius - innervation

femoral nerve L2-3

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sartorius - actions

flexion, external rotation and abduction of the hip; flexion and internal of the knee

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rectus femoris - origin (PA)

straight head - AIIS; reflected head - groove on ilium superior to acetabulum, fibrous capsule of hip joint

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rectus femoris - insertion (DA)

patella by quadriceps tendon, tibial tuberosity by patellar tendon (ligament)

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rectus femoris - innervation

femoral nerve L2, 3, 4

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rectus femoris - actions

knee extension and hip flexion

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gracilis - origin (PA)

lower 1/2 of pubic body, lower aspect of inferior pubic ramus and adjoining ischial ramus

gracilis - insertion (DA)

proximal medial surface of tibail at the pes anserine

gracilis - innervation

obturator nerve L2-3

gracilis - actions

flexion, medial rotation of knee; adduction of hip

pectineus - origin (PA)

pectineal line on superior ramus of pubis

pectineus - insertion (DA)

pectineal line between the lesser trochanter and the linea aspera

pectineus - innervation

femoral nerve L2-3

pectineus - actions

hip adduction and flexion

adductor brevis - origin (PA)

inferior ramus of pubis

adductor brevis - insertion (DA)

pectineal line and proximal 1/2 of medial lip of linea aspera

adductor brevis - innervation

obturator nerve L2-3

adductor brevis - actions

hip adduction

adductor longus - origin (PA)

posterior gluteal line of ilium, posterior sacrum, sacrotuberus ligament

adductor longus - insertion (DA)

gluteal tuberosity of femur and ITB

adductor longus - innervation

inferior glueteal nerve (L5, S1, S2)

adductor longus - actions

hip adduction and flexion

adductor magnus - origin (PA)

inferior ramus of pubis, inferior ramus of ischium and ischial tuberosity

adductor magnus - insertion (DA)

linea aspera, medial supracondylar line and adductor tubercle

adductor magnus - innervation

obturator nerve, L2-L4

adductor magnus - actions

hip adduction and extension

gluteus maximus - origin (PA)

posterior gluteal line of ilium, posterior sacrum, sacrotuberus ligament

gluteus maximus - insertion (DA)

gluteal tuberosity of femur and ITB

gluteus maximus - innervation

inferior gluteal nerve (L5, S1, S2)

gluteus maximus - actions

hip extension, abduction and external rotation; assists in stabilization of knee through action of ITB

gluteus minimus - origin (PA)

lateral ilium deep to gluteus medius between anterior and inferior gluteal line

gluteus minimus - insertion (DA)

anterolateral aspect of greater trochanter

gluteus minimus - innervation

superior gluteal L4-S1

gluteus minimus - actions

hip abduction and internal rotation

gluteus medius - origin (PA)

lateral ilium between posterior and anterior gluteal lines

gluteus medius - insertion (DA)

lateral aspect of greater trochanter

gluteus medius - innervation

superior gluteal nerve, L4-S1

gluteus medius - actions

all fibers - hip abduction posterior fibers - external rotation anterior fibers - internal rotation single limb support - keeps pelvis level (trendelenburg sign)

piriformis - origin (PA)

anterior surface of sacrum at level S2-S4

piriformis - insertion (DA)

superior and medial aspect of greater trochanter

piriformis - innervation

ventral rami L5, S1, S2

piriformis - actions

hip external rotation, abduction of hip (when flexed)

quadratus femoris - origin (PA)

lateral border of ischial tuberosity

quadratus femoris - insertion (DA)

intertrochanteric crest and quadrate tubercle of femur

quadratus femoris - innervation

nerve to quadratus muscle, L4-S1

quadratus femoris - actions

hip external rotation

biceps femoris - origin (PA)

long head - upper ischial tuberosity; short head - lateral lip of linea aspera inferior to gluteus maximus attachment, proximal 1/2 of lateral supracondylar line

biceps femoris - insertion (DA)

fibular head, LCL of knee, lateral tibial condyle

biceps femoris - innervation

long head - tibial division of sciatic L5, S1, S2; short head - common peroneal divison of sciatic L5, S1, S2

biceps femoris - actions

knee flexion, hip extension, secondarily laterally rotates hip and knee

semimembranosus - origin (PA)

superolateral aspect of ischial tuberosity

semimembranosus - insertion (DA)

posterior aspect of medial tibial condylar

semimembranosus - innervation

tibial division of sciatic nerve L5, S1, S2

semimembranosus - actions

knee flexion, hip extension, secondarily medially rotates hip and knee

semitendinosus - origin (PA)

inferomedial aspect of ischial tuberosity

semitendinosus - insertion (DA)

medial aspect of proximal tibia at pes anserine

semitendinosus - innervation

tibial division of sciatic nerve L5, S1, S2

semitendinosus - actions

knee flexion, hip extension, secondarily medially rotates hip and knee