KNEE MUSCLES

Question 1

RECTUS FEMORIS: ACTION ORIGIN INSERTION

Answer 1

Origin: Anterior inferior iliac spine and supraacetabular groove of ilium.

Insertion: Tibial tuberosity, via tendon of quadriceps femoris muscle and patellar ligament.

Action: Extends leg at knee joint

Question 2

VASTUS LATERLARIS: ACTION ORIGION AND INSERTION AND INNOVATION

Answer 2

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.

Action: Extends leg at knee joint.

Innervation: Femoral nerve (L2-L4).

Question 3

VASTUS INTERMEDIALRIS: ACTION ORIGIN INSERTION AND INNERVATION

Answer 3

Origin: Anterior and lateral surfaces of body of femur.

Insertion: Tibial tuberosity, via tendon of quadriceps femoris muscle and patellar ligament.

Action: Extends leg at knee joint.

Innervation: Femoral nerve (L2-L4).

Question 4

VASTUS MEDIALRIS: ORIGION, INSERTION ACTION AND INNERVATION

Answer 4

Origin: Medial part of the intertrochanteric line

Insertion: Tibial tuberosity, via tendon of quadriceps femoris muscle and patellar ligament

Action: Extends leg at knee joint.

Innervation: Femoral nerve (L2-L4).