Posterior and Anterior Thigh Flashcards
What is the proximal attachment of the semitendinosus and semimembranosus?
Ischial tuberosity
What is the distal attachment of the semitendinosus?
Medial surface of superior part of tibia
What nerve innervates the semitendinosus and semimembranosus?
Tibial division of sciatic nerve (L5,S1,S2)
What is the main action of the semitendonosus and semimembranosus?
- Extends thigh
- flex leg and rotate it medially when leg is flexed
- When thigh and leg are flexed these muscles can extend trunk
What is the distal attachment of the semimembranosus?
Medial condyle of tibia
What is the proximal attachment of the biceps femoris?
Long head: ischial tuberosity
Short head: linea aspera and lateral supracondylar line of femur
What is the distal attachment of the biceps femoris?
Head of fibula; tendon is split at this sight by fibular collateral ligament of knee
What nerve innervates the biceps femoris?
Long head: tibial division of sciatic nerve (L5,S1,S2)
Short head: common fibular division of sciatic nerve (L5,S1,S2)
What is the muscle action of the biceps femoris?
- Flexes leg and rotates is laterally when knee is flexed
- Extends thigh
What is the proximal attachment of the pectineus?
Superior ramus of the pubis
What is the distal attachment of the pectineus?
Pectineal line inferior to lesser trochanter
What nerve innervates the pectineus?
Femoral nerve (L2,L3) May receive branches from oburator nerve
What is the main action of the pectineus?
- Adducts and flexes thigh
- Assists in medial rotation of thigh
What is the proximal attachment of the psoas major?
Sides of T12-L5 vertebrae
What is the distal attachment of the psoas major?
Lesser trochanter of femur
What nerve innervates the psoas major?
Anterior rami of lumbar nerves (L1, L2)
What is the main action of the psoas major, psoas minor, and illiacus?
- Flex thigh at hip joint
- stabilizes hip joint
What is the proximal attachment of the psoas minor?
Sides of T12-L1 vertebrae and intervertebral discs
What is the distal attachment of the psoas minor?
Pectineal line, iliopectineal eminence via iliopectineal arch
What nerve innervates the psoas minor?
Anterior rami of lumbar nerve (L1, L2)
What is the proximal attachment of the iliacus?
- Iliac crest and fossa
- ala of sacrum
- Anterior sacro-iliac ligaments
What is the distal attachment of the iliacus?
- Tendon of psoas major
- Lesser trochanter of femur and below it
What nerve innervates the iliacus?
Femoral nerve (L2, L3)
What is the proximal attachment of the sartorius?
Anterior superior iliac spine
What is the distal attachment of the sartorius?
Medial surface of tibia?
What nerve the sartorius?
Femoral nerve (L2, L3)
What is the main action of the sartorius?
- Flexes, abducts, and laterally rotates thigh at hip joint
- Flexes leg at knee joint
What id the proximal attachment of the rectus femoris?
Anterior inferior iliac spine
What is the distal attachment of the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius?
Quadriceps tendon and patellar tendon
What nerve innervates the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius?
Femoral nerve (L2, L3, L4)
What is the main action of the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius?
- Extend leg at knee joint
- Steadies hip joint
What is the proximal attachment of the vastus lateralis?
- Greater trochanter
- Linea aspera of femur
What is the proximal attachment of the vastus medialis?
- Intertrochanteric line
- Linea aspera of femur
What is the proximal attachment of the vastus intermedius?
Shaft of femur
