Thigh Attachments, Actions, Innervations Flashcards
Sartorius Attachments
ASIS and superior half of notch inferior to ASIS
Pes anserinus (superior medial tibia)
Sartorius Action
Flexes the thigh at the hip
abducts thigh
laterally rotates thigh
flexes leg at knee
Sartorius Innervation
Femoral Nerve
L2, L3
Rectus Femoris Attachments
AIIS and ilium superior to acetabulum
Base of patella (and tibial tuberosity vis patella ligament)
Rectus Femoris Action
Flexion of thigh at hip
extension of leg at knee
Rectus Femoris Innervation
Femoral Nerve L2, L3, L4
L3, L4 Main suppliers
Vastus Medialis Attachments
intertrochanteric line and medial lip of linea aspera
base of patella (and tibial tuberosity via patella ligament)
aponeurotic fibres form medial patellar retinacula
Vastus Medialis Actions
extend leg at knee
counterbalance lateral pull of rectus femoris and vastus lateralis on patella (VMO)
Vastus Medialis Innervation
femoral nerve (L2, L3, L4)
L3, L4 main suppliers
Vastus Lateralis Attachments
greater trochanter and lateral lip of linea aspera
base of patella (tibial tuberosity via patella ligament)
aponeurotic fibres form lateral patellar retinacula
Vastus Lateralis Actions
Extends leg at knee
Vastus Lateralis Innervation
Femoral nerve L2, L3, L4 (L3, L4 main suppliers)
Vastus intermedius Attachments
anterior and lateral surfaces of femoral shaft
base of patella (tibial tuberosity via patella ligament)
Vastus Intermedius Action
Extension of the leg at the knee
Vastus Intermedius Innervation
femoral nerve L2, L3, L4 (L3 and L4 main suppliers)
What is the articularis genu?Where does it attach?
It is a small, flat muscle, attached to inferior anterior knee
shaft of femur and superior aspect of knee joint (suprapatellar bursa)
Articularis Genu Action
Pulls synovial membrane superiorly during extension of the leg at the knee
Pectineus Attachments
Superior pubic rams
pectineal line
Pectineus Action
Adducts and flexes thigh at hip joint
assists medial rotation
Pectineus Innervation
femoral nerve (L2, L3) L2 main supplier
Adductor Longus Attachments
Body of pubis
Middle third of line aspera
Adductor Longus Action
adducts thigh
active during flexion and extension of thigh and gait
Adductor Longus Innervation
Anterior division of obturator nerve L2, L3, L4 (L3 main supplier)
Adductor Brevis Attachment
body and inferior ramus of pubis
pectineal line and proximal part of linea aspera
Adductor Brevis Action
adducts thigh,
active during flexion and extension of the thigh and gait
Adductor Brevis Innervation
anterior division of obturator nerve (L2, L3, L4 (L3 main supplier)
Adductor Magnus Attachments
adductor part: inferior ramus of pubis and ramus of ischium
gluteal tuberosity and linea aspera
hamstring part: ischial tuberosity
medial supracondylar line and adductor tubercle
Adductor Magnus Actions
adducts thigh
flexes thigh
(adductor part)
extends thigh (hamstring part)
Adductor Magnus Innervation
adductor part: posterior division of obturator nerve (L2, L3, L4) L3, L4 main suppliers
hamstring part: sciatic nerve (L4)
Gracilis Attachments
body and inferior ramus of pubis
superior medial tibia (pes anserinus)
Gracilis Action
adducts thigh
flexes leg at knee
rotates leg medially
Gracilis Innervation
Obturator nerve (L2, L3) L2 main supplier
What three muscles make up the Pes Anserinus
Distal Tendinous Attachment of:
Gracilis
Semitendinosus
Sartorius
What does Pes Anserinus Mean?
Goose’s foot
Semitendinosus Attachment
ischial tuberosity
pes anserinus
Semitendinosus Action
extends thigh at hip
flexes leg at knee
medially rotates leg if knee flexed
Semitendinosus Innervation
tibial division of sciatic nerve (L5, S1, S2)
L5 and S1 main suppliers
Semimembranosus Attachments
ischial tuberosity
posterior aspect medial tibial condyle, forms oblique popliteal ligament
Semimembranosus Action
extends thigh at hip
flexes leg at knee
medially rotates leg if knee flexed
Semimembranosus Innervation
tibial division of sciatic nerve (L5, S1, S2) L5, S1 main suppliers
Biceps Femoris Attachments
long head: ischial tuberosity
short head: linea aspera and lateral supracondylar line
head of fibula
Biceps Femoris Action
flexion of leg at knee
extension of thigh at hip
laterally rotates leg if knee flexed
Biceps Femoris Innervation
long head:
tibial division of sciatic nerve (L5, S1, S2) S1 main supplier
short head:
common fibular division of sciatic nerve (L5, S1, S2) S1 main supplier
