Knee - muscles (flexion and extension)

Question 1

Name the 6 knee flexor muscles

Answer 1

Biceps femoris (Long head)
Biceps femoris (Short head)
Semitendinosus
Semimembranosus
Gracilis
Sartorius

Question 2

What is the origin, insertion and innervation of the biceps femoris long head muscle?

Answer 2

Origin – Ischial tuberosity
Insertion – Head of fibula
Innervation – Tibial division of sciatic nerve (L5-S2)

Question 3

What is the origin, insertion and innervation of the biceps femoris short head muscle?

Answer 3

Origin - Linea aspera and lateral supracondylar line
Insertion – Head of fibula
Innervation – Common fibular division of sciatic nerve (L5-S2)

Question 4

What is the origin, insertion and innervation of the semitendinosus muscle?

Answer 4

Origin – Ischial tuberosity
Insertion – Medial aspect of proximal part of tibia
Innervation – Tibial division of sciatic nerve (L5-S2)

Question 5

What is the origin, insertion and innervation of the semimembranosus muscle?

Answer 5

Origin – Ischial tuberosity
Insertion – Medial condyle of tibia
Innervation – Tibial division of sciatic nerve (L5-S2)

Question 6

What is the origin, insertion and innervation of the gracilis muscle?

Answer 6

Origin – Body of pubis and inferior pubic ramus
Insertion – Medial aspect of proximal part of tibia
Innervation – Obturator nerve (L2-L3)

Question 7

What is the origin, insertion and innervation of the sartorius muscle?

Answer 7

Origin – Anterior superior iliac spine
Insertion – Medial aspect of proximal part of tibia
Innervation – Femoral nerve (L2-L3)

Question 8

Name the 5 knee extensor muscles

Answer 8

Rectus femoris muscle
Vastus lateralis
Vastus medialis
Vastus intermedius
Tensor fascia latae

Question 9

What is the origin, insertion and innervation of the rectus femoris muscle?

Answer 9

Origin – Anterior inferior iliac spine and supraacetabular groove of ilium
Insertion – Tibial tuberosity, via tendon of quadriceps femoris muscle and patellar ligament
Innervation – Femoral nerve (L2-L4)

Question 10

What is the origin, insertion and innervation of the vastus lateralis muscle?

Answer 10

Origin – Intertrochanteric line, greater trochanter, gluteal tuberosity, and lateral lip of linea aspera of femur
Insertion – Tibial tuberosity, via tendon of quadriceps femoris muscle and patellar ligament; lateral border of patella
Innervation – Femoral nerve (L2-L4)

Question 11

What is the origin, insertion and innervation of the vastus medialis muscle?

Answer 11

Origin – Medial part of the intertrochanteric line and medial to the spiral line and linea aspera of the femur, extending inferiorly to the medial supracondylar line
Insertion – Tibial tuberosity, via tendon of quadriceps femoris muscle and patellar ligament, and medial border of patella
Innervation – Femoral nerve (L2-L4)

Question 12

What is the origin, insertion and innervation of the vastus intermedius muscle?

Answer 12

Origin – Anterior and lateral surfaces of body of femur
Insertion – Tibial tuberosity, via tendon of quadriceps femoris muscle and patellar ligament
Innervation – Femoral nerve (L2-L4)

Question 13

What is the origin, insertion and innervation of the tensor fascia latae muscle?

Answer 13

Origin – Anterior superior iliac spine and anterior one third of outer lip of iliac crest
Insertion – Tubercle of IT tract on the tibia, via IT tract
Innervation – Superior gluteal nerve (L4-S1)