Week 5: Bursae & Muscles of the Knee Joint Flashcards

1
Q

Describe the gross morphology of a bursa:

A
  • A closed connective tissue sac (filled with fluid) which develops in response to friction
  • Typically collapsed, containing only enough fluid to moisten their
    walls (i.e. a potential space)
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2
Q

What is bursitis?

A

When the space between the walls may become inflated with fluid if the bursa becomes inflamed

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3
Q

What is the function of a bursa?

A

Decreases friction between tendon and bone, ligament and bone, bone and skin, muscle and muscle, muscle and tendon, muscle and bone

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4
Q

Where is the prepatellar bursa located?

A

Between the skin and lower part of patella and the patellar ligament

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5
Q

Where is the superficial infrapatellar bursa located?

A

Between the skin and the patellar ligament i.e. it is subcutaneous

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6
Q

Where is the suprapatellar bursa or recess located?

A

Between the tendon of the quadriceps and the anterior surface of the femur

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7
Q

Where is the deep infrapatellar bursa located?

A

Between the patellar ligament and the tibia

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8
Q

Where are the bursae of the heads of gastrocnemius located?

A

Between the tendon of origin of each head and the joint capsule

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9
Q

What muscles cross anterior to the knee joint?

A

Quadriceps femoris:
- Rectus femoris
- Vastus medialis
- Vastus lateralis
- Vastus intermedius

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10
Q

Which muscles attach to the patella via the quadriceps tendon?

A

The four heads of the quadriceps femoris muscle

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11
Q

What is the action of the quadriceps muscles at the knee joint?

A
  • Extension of the leg on the thigh
  • Patellar stability - particularly vastus medialis
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12
Q

What is the innervation of the quadriceps muscles?

A

Femoral nerve

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13
Q

What muscles cross posterior to the knee joint?

A
  • Hamstring muscles:
  • Semitendinosus
  • Semimembranosus
  • Biceps femoris
  • Sartorius
  • Gracilis
  • Gastrocnemius
  • Popliteus
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14
Q

What are the attachments sites of the semimembranosus?

A
  • Ischial tuberosity
  • Posteromedial aspect of tibia, medial condyle of tibia
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15
Q

What are the attachments sites of the semitendinosus?

A
  • Ischial tuberosity
  • Anteromedial aspect body of tibia medial and inferior to tibial tuberosity
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15
Q

What are the attachments sites of the biceps femoris?

A
  • Long head: ischial tuberosity
  • Short head: lateral lip linea aspera and lateral intermuscular septum
  • Head of fibula and lateral tibial condyle
16
Q

What are the attachments sites of the gastrocnemius?

A
  • Medial and lateral femoral condyles
  • Posterior surface calcaneus
17
Q

What are the attachments sites of the politeus?

A
  • Lateral surface of lateral condyle of femur
  • Posterior surface of tibia above soleal line
18
Q

What is the plantaris?

A

A small muscle that attaches to the lateral femoral condyle deep to the lateral head of gastrocnemius also crosses the posterior knee joint

19
Q

What nerve innervates each of the posterior muscles of the knee joint?

A

All innervated by the tibial nerve, except the short head of biceps femoris which is supplied by the common fibular nerve

20
Q

Describe the general action of the posterior muscles of the knee joint:

A

Flexion of the leg

21
Q

With the leg off the ground, what action of the tibia will popliteus perform?

A

Medially rotates the tibia (femur considered fixed)

22
Q

If the foot was firmly planted on the ground, so that the tibia stayed fixed, what action of the femur would popliteus perform?

A

Laterally rotates femur during weight bearing, and stabilises the femur against any unwanted medial rotation (tibia considered fixed)

23
Q

When the tibia is non-weightbearing, what muscle(s) are capable of producing medial rotation of the tibia?

A

Semitendinosus, gracilis, sartorius
Semimembranosus, popliteus

24
Q

When the tibia is non-weightbearing, what muscle(s) are capable of producing lateral rotation of the tibia?

A

Biceps femoris

25
Q

Which muscles form the margins of the upper part of the popliteal fossa?

A
  • Distal part of semitendinosus and semimembranosus (medial)
  • Distal part of biceps femoris (lateral)
26
Q

What muscles form the margins of the lower part of the fossa?

A
  • Medial head gastrocnemius (medial)
  • Lateral head of gastrocnemius and plantaris (lateral)
27
Q

What forms the floor of the fossa?

A

Knee joint capsule, adjacent surfaces of femur and tibia, popliteus muscle

28
Q

What forms the roof of the fossa?

A

Deep fascia

29
Q

Which neurovascular structures lie within the popliteal fossa?

A

Tibial (midline) and common fibular (lateral) nerves, popliteal artery and vein

30
Q

What superficial vein enters the popliteal fossa?

A

The small saphenous vein - lies within the superficial fascia of the leg, pierces deep fascia to drain into the popliteal vein

31
Q

Where does the adductor magnus attach to?

A

Adductor tubercle