Week 7: Hip Flexors & Knee Extensors Flashcards
Structure: Pectineus mm.
Origin: superior ramus of pubis
Insertion: pectineal line of femur, inferior to lesser trochanter
Innervation: femoral nerve (L2, 3).
Blood supply: internal iliac and profunda femoris arteries.
- pectineus can’t move on its own, it assists other muscles.
- Assists with:
- flexion
- adduction
- medial rotation of the thigh at the hip
Structure: Sartorius mm.
Origin: ASIS and superior part of notch inferior to it
Insertion: superior part of medial surface of tibia
Innervation: femoral n. L2-L3
Blood supply: Branches of femoral artery.
Assists with:
- flexion
- lateral rotation of the thigh at the hip
- medial rotation of leg
- abduction of the thigh at the hip
- flexion at knee joint
Structure: iliacus mm.
origin: iliac crest, iliac fossa, ala of sacrum, and anterior sacro-iliac ligaments
Insertion: tendon of psoas major, lesser trochanter, and femur distal to it
Innervation: Femoral nerve (L2, 3).
Blood supply: Iliolumbar artery from internal iliac artery.
Primary action (conjointly w psoas major and minor):
- Flexion of the thigh at the hip
- stabilizing hip joint
structure: psoas major mm.
origin: sides of T12-L5 vertebrae and discs between them, transverse processes of all lumbar vertebrae
Insertion: The lesser trochanter of the femur
Innervation: anterior rami of lumbar nerves L1-L3
Blood supply: Iliolumbar artery from internal iliac artery.
Primary action( conjointly w/ psoas minor and iliacus):
- Flexion of the thigh at the hip
- stabilizing hip joint
Structure: psoas minor mm.
Origin: sides of T12-L1 vertebrae and intervertebral discs
Insertion: pectineal line and iliopubic eminence via iliopectineal arch
Innervation: Anterior rami of lumbar nerves L1-L2
Action (conjointly w/ psoas major and iliacus):
- flexion of thigh at hip joint
- stabilizing hip joint
Structure: Rectus femoris mm.
Origin: ASIS and ilium superior to acetabulum
Insertion: Via quadriceps tendon and independent attachments to base of patella, indirectly via patellar ligament to tibial tuberosity, medial and lateral vasti also attach to tibia and patella via aponeuroses (med/lat. patellar retinacula)
Innervation: Femoral n. L2-L4
Primary Action:
Extend leg at knee joint
steadies hip joint
assists iliopsoas w flexion of thigh
Structure: Vastus lateralis mm.
Origin: greater trochanter and lateral lip of linea aspera of femur
Insertion: Via quadriceps tendon and independent attachments to base of patella, indirectly via patellar ligament to tibial tuberosity, medial and lateral vasti also attach to tibia and patella via aponeuroses (med/lat. patellar retinacula)
Innervation: Femoral n. L2-L4
Primary Action:
Extend leg at knee joint
Structure: Vastus intermedius mm.
Origin: anterior and lateral surfaces of shaft of femur
Insertion: Via quadriceps tendon and independent attachments to base of patella, indirectly via patellar ligament to tibial tuberosity, medial and lateral vasti also attach to tibia and patella via aponeuroses (med/lat. patellar retinacula)
Innervation: Femoral n. L2-L4
Primary Action:
Extend leg at knee joint
Structure: Vastus medialis mm.
Origin: intertrochanteric line and medial lip of linea aspera of femur
Insertion: Via quadriceps tendon and independent attachments to base of patella, indirectly via patellar ligament to tibial tuberosity, medial and lateral vasti also attach to tibia and patella via aponeuroses (med/lat. patellar retinacula)
Innervation: Femoral n. L2-L4
Primary Action:
Extend leg at knee joint
Structure: Adductor Longus mm.
Origin: body of inferior ramus of pubis
Insertion: middle 3rd of linea aspera of femur
Innervation: Obturator n. and branch of anterior division, L2-L4
Action: Adducts thigh
Structure: Adductor brevis mm.
Origin: body of inferior ramus of pubis
Insertion: pectineal line and proximal part of linea aspera of femur
Innervation: Obturator n. and branch of anterior division (L2-L4)
Action:
- Adducts thigh
- flexes it to some extent
Structure: Adductor magnus mm.
Origin:
Adductor part: inf. ramus of pubis and ramus of ischium
Hamstring part: ischial tuberosity
Insertion:
adductor part: gluteal tuberosity, linea aspera, and medial supracondylar line
Hamstring part: adductor tubercle of femur
Innervation: Adductor part: Obturator n. L2-L4
Hamstring part: tibial part of sciatic n. L4
Action:
- Adducts thigh
- adductor part: flexes thigh
- hamstring part: extends thigh
Structure: Gracilis mm.
Origin: body and inferior ramus of pubis
Insertion: superior part of medial surface of tibia
Innervation: Obturator n. (L2, L3)
Primary Action:
- adducts thigh
- flexes leg
- helps rotate leg medially
Structure: Obturator externus mm.
Origin: margins of the obturator foramen and obturator membrane
Insertion: trochanteric fossa of femur
Innervation: obturator n. L3, L4
Main Action:
laterally rotates thigh
steadies head of femur in acetabulum
