Practical topic 20

Question 1

Which muscles are m. Quadriceps femoris composed of?

Answer 1

1. M. rectus femoris
2. M. vastus lateralis
3. M. vastus intermedius
4. M. vastus medialis

Question 2

M. rectus femoris

Answer 2

Origin: From corpus of os ilium (area m. Recti femoris medialis et lateralis).

Insertion:

• Tuberositas tibia
• Crista tibia
• Patella:
  
  • Patellar ligament on tibial tuberosity

Action:

• Flexor of hip
• Extends the stifle

Innervation:

• N. Femoralis
• N. ischiadicus

Blood supply:

• A. circumflexa femoris lateralis
• A. circumflexa ilium superficialis

Question 3

M. vastus lateralis

Answer 3

Origin: Proximal part of labium laterale on femur (craniolateral)

Insertion:

• Tuberositas tibia
• Crista tibia
• Patella:
  
  • Patellar ligament on tibial tuberosity

Action: Extensor stifle

Innervation:

• N. Femoralis
• N. ischiadicus

Blood supply:

• A. circumflexa femoris lateralis
• A. circumflexa ilium profunda

Question 4

M. vastus intermedius

Answer 4

Origin: Proximal part of labium laterale on femur (cranial surface)

Insertion:

• Tuberositas tibia
• Crista tibia
• Patella:
  
  • Patellar ligament on tibial tuberosity

Action: Extends the stifle

Innervation:

• N. Femoralis
• N. ischiadicus

Blood supply:

• A. circumflexa femoris lateralis
• A. circumflexa ilium profunda

Question 5

M. vastus medialis

Answer 5

Origin: Medial side of the proximal end of the cranial surface of femur (craniomedial)

Insertion:

• Tuberositas tibia
• Crista tibia
• Patella:
  
  • Patellar ligament on tibial tuberosity

Action: Flexes stifle

Innervation:

• N. Femoralis
• N. ischiadicus

Blood supply:

• A. circumflexa femoris lateralis
• A. circumflexa ilium profunda

Question 6

M. popliteus

Answer 6

Origin: The popliteal fossa on the lateral condyle of the femur

Insertion: The proximal third of the caudomedial border of the tibia

Action: To rotate the leg medially and flex the stifle, in ca also to pronate the crus

Innervation: N. tibialis

Blood supply: A. poplitea