LR 1 of 11 LR
THIGH ANATOMY
ANTERIOR COMPARTMENT OF THIGH // FLEXOR COMPARTMENT
Chief action: Flexion of thigh at hip joint
CHIEF NERVE: Femoral Nerve (L2, L3, L4)
* Exception: Psoas Major- supplied by anterior rami from L1- L3 (spinal nerve)
Muscles of ACT (FCT)
▪ Psoas major- origin : lumbar transverse processes, intervertebral discs, and
adjacent bodies from TXII to LV
Insertion: lesser trochanter
-Only muscle in ACT with DIFFERENT nerve supply i.e. ANTERIOR
RAMI FROM L1-L3
▪ Iliacus- origin: iliac fossa
Insertion: lesser trochanter
▪ Sartorius- origin: Anterior superior iliac spine
Insertion: Anterior surface of Upper end of TIBIA
-Along with flexion of thigh at hip joint; it flexes LEG at knee joint & helps in
LATERAL ROTATION.
▪ Quadriceps Femoris- 4 muscles that form same tendon (ie. QF tendon that
continues to become patellar ligament)
-2 muscles that form the QF tendon & attach to patella are VI and VM
-All of them have the action: EXTENDS LEG at KNEE JOINT
1. Vastus Lateralis- origin: lateral part of inter-trochanteric line on femur
& lateral lip of linea aspera
Action: extends leg at knee joint
2. Rectus Femoris- has 2 heads ~ straight head origin: anterior, inferior
iliac spine
~reflected head origin: ilium just superior to
acetabulum
*Action: flexion of thigh, extension of knee
3. Vastus Intermedius (VI) – origin: upper 2/3rd of anterior and lateral
surfaces of femoral shaft
Insertion: forms QF Tendon & LATERAL margin of patella
Action: extension of knee
4. Vastus Medialis (VM)- origin: intertrochanteric line & medial lip of linea
aspera
, LR 2 of 11 LR
Insertion: forms QF tendon & MEDIAL border of patella
Action: extension of knee
Patellar ligament- extension of tendons of quadriceps femoris
-extends from base of patella to tibial tuberosity
-Aka infrapatellar ligament
Femoral Triangle
Base – Inguinal Ligament
Medial border of
triangle--Medial border of
Lateral border of adductor longus
triangle—medial
border of Sartorius
Apex
-Femoral Triangle is continuous with ADDUCTOR CANAL
-Floor of triangle = pectineus, lateral border of adductor longus, iliopsoas
-Roof of triangle = Skin of superficial fascia
Contents of triangle
-Going medial to lateral
1. Lymph nodes
Medial Compartment
Middle Compartment – —Femoral Canal- has
2. Femoral Vein has femoral vein lymph-nodes
Lateral Compartment-
has femoral artery &
3. Femoral Artery genitofemoral nerve
4. Femoral Nerve
Femoral nerve
outside the
THIGH ANATOMY
ANTERIOR COMPARTMENT OF THIGH // FLEXOR COMPARTMENT
Chief action: Flexion of thigh at hip joint
CHIEF NERVE: Femoral Nerve (L2, L3, L4)
* Exception: Psoas Major- supplied by anterior rami from L1- L3 (spinal nerve)
Muscles of ACT (FCT)
▪ Psoas major- origin : lumbar transverse processes, intervertebral discs, and
adjacent bodies from TXII to LV
Insertion: lesser trochanter
-Only muscle in ACT with DIFFERENT nerve supply i.e. ANTERIOR
RAMI FROM L1-L3
▪ Iliacus- origin: iliac fossa
Insertion: lesser trochanter
▪ Sartorius- origin: Anterior superior iliac spine
Insertion: Anterior surface of Upper end of TIBIA
-Along with flexion of thigh at hip joint; it flexes LEG at knee joint & helps in
LATERAL ROTATION.
▪ Quadriceps Femoris- 4 muscles that form same tendon (ie. QF tendon that
continues to become patellar ligament)
-2 muscles that form the QF tendon & attach to patella are VI and VM
-All of them have the action: EXTENDS LEG at KNEE JOINT
1. Vastus Lateralis- origin: lateral part of inter-trochanteric line on femur
& lateral lip of linea aspera
Action: extends leg at knee joint
2. Rectus Femoris- has 2 heads ~ straight head origin: anterior, inferior
iliac spine
~reflected head origin: ilium just superior to
acetabulum
*Action: flexion of thigh, extension of knee
3. Vastus Intermedius (VI) – origin: upper 2/3rd of anterior and lateral
surfaces of femoral shaft
Insertion: forms QF Tendon & LATERAL margin of patella
Action: extension of knee
4. Vastus Medialis (VM)- origin: intertrochanteric line & medial lip of linea
aspera
, LR 2 of 11 LR
Insertion: forms QF tendon & MEDIAL border of patella
Action: extension of knee
Patellar ligament- extension of tendons of quadriceps femoris
-extends from base of patella to tibial tuberosity
-Aka infrapatellar ligament
Femoral Triangle
Base – Inguinal Ligament
Medial border of
triangle--Medial border of
Lateral border of adductor longus
triangle—medial
border of Sartorius
Apex
-Femoral Triangle is continuous with ADDUCTOR CANAL
-Floor of triangle = pectineus, lateral border of adductor longus, iliopsoas
-Roof of triangle = Skin of superficial fascia
Contents of triangle
-Going medial to lateral
1. Lymph nodes
Medial Compartment
Middle Compartment – —Femoral Canal- has
2. Femoral Vein has femoral vein lymph-nodes
Lateral Compartment-
has femoral artery &
3. Femoral Artery genitofemoral nerve
4. Femoral Nerve
Femoral nerve
outside the
