OINA: Thighs

Question 1

Sartorius

Answer 1

O: ASIS

I: Upper medial surface of shaft of tibia

N: Femoral nerve L2,L3

A: Flex, Abducts, ER thigh at hip joint

Question 2

Iliacus

Answer 2

O: Iliac fossa of hip bone

I: With Psoas into lesser trochanter of femur

N: Femoral nerve L2,L3

A: Flexes thigh on trunk, if thigh is fixed flexes the trunk on thigh as in sitting up from lying down

Question 3

Psoas

Answer 3

O: Transverse process, bodies, IV disc of the 12th thoracic and 5 lumbar vertebrae

I: With Iliacus into the lesser trochanter of femur

N: Lumbar Plexus L1, L2, L3

A: Same as Iliacus

Question 4

Pectineus

Answer 4

O: Superior Pubic Ramos

I: Upper end of linea aspera of shaft of femur

N: Femoral nerve L2,L3

A: Flexes and adducts thigh at hip jt.

Question 5

Quadriceps femoris

Answer 5

Common I,N,A

I: Quadriceps tendon into patella, then via ligamentum patellae into tubercle of tibia

N: Femoral nerve L2,L3, L4

A: Extension of leg at knee joint

Question 6

Rectus femoris

Answer 6

O: Straight head - AIIS
Reflected head - ilium above acetabulum

A: Flexes thigh at hip jt.

Question 7

Vastus Lateralis

Answer 7

O: Upper end of shaft of femur

Question 8

Vastus Medialis

Answer 8

O: Upper end and shaft of femur

A: Stabilizes patella

Question 9

Vastus intermedius

Answer 9

O: Anterior and Lateral surface of shaft of femur

A: Articularis genus retracts synovial membrane

Question 10

Contents of medial fascia

Answer 10

Muscles: Gracilis, Adductor longus, Adductor brevis, Adductor magnus, and obturator externus

Blood Supply: Profunda femoris artery and obturator artery

N: Obturator nerve

Question 11

Gracilis

Answer 11

O: Inferior ramus of pubis, ramus of ischium

I: Upper part of shaft of tibia on medial side

N: Obturator nerve L2,L3

A: Adducts thigh at hip joint, Flexes leg at knee jt.

Question 12

Adductor longus

Answer 12

O: Body of pubis, medial to pubic tubercle

I: Posterior Surface of shaft of femur (linea aspera)

N: Obturator nerve L2,L3,L4

A: Adducts thigh at hip joint, and assist in ER

Question 13

Adductor Brevis

Answer 13

O: Inferior ramus of pubis

I: Posterior surface of shaft of femur (linear aspera)

N: Obturator nerve L2,L3,L4

A: Adducts thigh at hip joint, and assist in ER

Question 14

Adductor Magnus

Answer 14

O: Inferior ramus of pubis, Ischial tuberosity, and ramus of ischium

I: Posterior surface of shaft of femur, adductor tubercle

N: Obturator nerve - adductor portion,
Sciatic nerve - hamstring portion

A: Adducts thigh at hip joint and assists in ER; hamstring portion extends thigh at hip joint

Question 15

Contents of the Posterior Fascial Compartment of the Thigh

Answer 15

Muscles: Biceps femoris, semitendinosus, semimembranosus, and a small part of the adductor magnus (hamstring muscle)

Blood supply: Branches of the profunda femoris artery

Nerve Supply: Sciatic nerve

Question 16

Biceps femoris

Answer 16

O: Long head - ischial tuberosity
Short head - linea aspera, lateral supracondylar ridge of shaft of femur

I: Head of fibula

N: Long head - tibial portion of sciatic nerve
Short head - common peroneal portion of sciatic nerve

A: Flexes and laterally rotates leg at knee joint, Long head also extends thigh at hip jt.

Question 17

Semitendinosus

Answer 17

O: Ischial tuberosity

I: Upper part of medial surface of shaft of tibia

N: Tibial portion of sciatic nerve L5, S1, S2

A: Flexes and medially rotates leg at knee jt.; extends thigh at hip jt.

Question 18

Semimembranosus

Answer 18

O: Ischial tuberosity

I: Medial condyle

N: Tibial portion of sciatic nerve L5, S1, S2

A: Flexes & medially rotates leg at knee jt.; extends thigh at hip jt.

Question 19

Adductor magnus (hamstring portion)

Answer 19

O: Ischial tuberosity

I: Adductor tubercle

N: Tibial portion of sciatic nerve L2, L3, L4

A: Extends thigh at hip jt.