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Gross Anatomy II NYCC > Posterior Thigh & Popliteal Fossa > Flashcards

Posterior Thigh & Popliteal Fossa Flashcards

1
Q

What muscles form the 4 borders of the popliteal fossa?

A

Superomedial: semimembranosus, semitendinosus
Inferomedial: medial head of gastrocnemius
Superolateral: biceps femoris
Inferolateral: lateral head of gastrocnemius

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2
Q

What nerve innervates the skin of the middle posterior thigh?

A

Posterior femoral cutaneous (S1-S3)

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3
Q

Name the 3 muscles in the posterior thigh

A

Semimembranosus
Semitendinosus
Biceps femoris

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4
Q

All posterior thigh muscles originate on the _____ (except short head biceps femoris)

A

Ischial tuberosity

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5
Q

Origin of Short head of biceps femoris

A

Linea aspera & lateral supracondylar ridge of femur

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6
Q

All posterior thigh muscles are innervated by the… (except short head biceps femoris)

A

Tibial division of sciatic nerve

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7
Q

Innervation of short head of biceps femoris

A

Common fibular (peroneal) branch of sciatic nerve

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8
Q

Branches of sciatic nerve

A

At popliteal fossa:
Tibial division
Common fibular (peroneal) division

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9
Q

Branches of tibial nerve

A

Sural n
Lateral plantar n
Medial plantar n

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10
Q

Branches of common fibular nerve

A

Sural n
Deep fibular n
Superficial fibular n
Lateral Sural cutaneous n

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11
Q

The tibial nerve supplies the ____

A

Posterior leg

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12
Q

The lateral and medial plantar nerves supply the ____

A

Foot

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13
Q

The deep fibular nerve supplies the ____

A

Anterior leg

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14
Q

The superficial fibular nerve supplies the ____

A

Lateral leg

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15
Q

Origin of biceps femoris

A
  • Long: ischial tuberosity
  • Short: lateral lip of linea aspera & lateral supracondylar ridge of femur
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16
Q

Insertion of biceps femoris

A

Head of fibula & lateral condyle of tibia

17
Q

Innervation of biceps femoris

A

Long: tibial division of sciatic n
Short: common fibular division of sciatic n

18
Q

Action of biceps femoris

A
  • flex & laterally rotate leg at the knee
  • long head extends the thigh at the hip
19
Q

Origin & insertion of semitendinosus

A

O: ischial tuberosity
I: medial surface of proximal tibia

20
Q

Innervation of semitendinosus

A

Tibial division of sciatic n

21
Q

Action of semitendinosus

A
  • flex leg & medially rotate tibia at the knee
  • extend thigh at the hip
22
Q

What structures form the pes anserinus?

A

Tendons of semitendinosus, sartorius, and gracilis

23
Q

Origin & insertion of semimembranosus

A

O: ischial tuberosity
I: posterior aspect of medial condyle of tibia

24
Q

Innervation of semimembranosus

A

Tibial division of sciatic n

25
Q

Action of semimembranosus

A
  • flex leg & medially rotate tibia at the knee
  • extend thigh at the hip
26
Q

Part of the semimembranosus tendon forms the ____

A

Oblique popliteal ligament

27
Q

Describe the contents of the popliteal fossa

A

Popliteal a
Popliteal v
Common fibular n
Tibial n

28
Q

Describe the Sural nerve

A
  • Sural communicating n (from common fibular n)
  • medial Sural cutaneous n (from tibial n)
    Join to form Sural n
29
Q

The Sural nerve supplies…

A
  • skin along distal 2/3 of posterolateral calf
  • lateral foot, over 5th digit
30
Q

Describe variation in the formation of the Sural nerve

A

Communicating & medial Sural nn join much lower in the leg

31
Q

Describe the branches of the popliteal artery

A
  • superior lateral & superior medial genicular aa
  • middle genicular a
  • Sural aa
  • inferior lateral & inferior medial genicular aa
32
Q

What is the passageway for the popliteal artery?

A

Adductor hiatus
(Above this = femoral a)

33
Q

The popliteal artery ends by splitting into the ____ and ____

A

Anterior & posterior tibial aa

34
Q

The main blood supply to the knee joint is the ____

A

Popliteal a

35
Q

The posterior tibial artery gives rise to the ____

A

Fibular artery

Gross Anatomy II NYCC (18 decks)

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