9/14 Posterior Thigh & Popliteal Fossa - Carter (posterior thigh completed)

Question 1

Coming off the sciatic nerve, what are the tibial divisions?

Answer 1

Nerve –> long head of biceps femoris

Nerve –> semitendinosus

Nerve –> semimembranosus

Nerve –> adductor Magnus

Question 2

How many joints does the long head of the biceps femoris cross? Where does it attach to and originate from?

Answer 2

Crosses 2 joints(add

Origin –> ischial tuberoscity

Attachment –> proximal tibia

Question 3

Where does the short head of the biceps femoris originate and insert in?

Answer 3

Origin –> lateral lip of linea aspera of the femur (back of the femur)

Inserts –> lateral tibial condyle | head of the fibula

Question 4

What is the only action of the short head of the biceps femoris?

Answer 4

To flex the knee

Question 5

When the sciatic nerve divides what does it divide into? What is their orientation?

Answer 5

Tibial nerve - medial

Peroneal nerve - lateral

Question 6

What supplies and innervates the short biceps femoris?

Answer 6

Supply –> perforating branches of the profunda femoris (deep femoral)
-this supplies all of the posterior compartment

Innervates –> sciatic nerve (peroneal division) aka common fibular nerve

Question 7

What makes up the inferior border of the popliteal fossa?

Answer 7

Lateral head of gastrocnemius

Medial head of gastrocnemius

Question 8

What is a tributary to the popliteal vein coming up the back of the leg?

Answer 8

Great saphenous vein

Question 9

What is the most commonly injured nerve in the leg?

Answer 9

Common coronial nerve

Question 10

What are the muscles of the posterior thigh compartment collectively referred to as the hamstring?

Answer 10

Semitendinosus (medial)

Biceps femoris - Long head (lateral)

Biceps femoris - Short head (lateral)

Semimembranosus (deep, medial)

Question 11

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

Answer 11

O –> ischial tuberoscity

I –> superior, medial tibia

N –> sciatic nerve (tibial division)

A –> extends thigh | flexes leg

Question 12

What is the origin, insertion, innervation, and action of the biceps femoris (long head)?

Answer 12

O –> Ischial tuberoscity

I –> lateral tibial condyle | head of fibula

A –> extends thigh | flexes leg

N –> sciatic nerve (tibial division)

Question 13

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

Answer 13

O –> ischial tuberoscity

I –> medial condyle of the tibia (medial and posterior surfaces)

N –> sciatic nerve (tibial division)

A –> Extends the thigh | flexes the leg

Question 14

What is the origin, insertion, innervation, and action of the Biceps femoris (short head)?

Answer 14

O –> lateral lip of linea aspera of the femur

I –> lateral tibial condyle | head of fibula

N –> sciatic nerve (peroneal division) also called common fibular)

A –> extends the thigh | flexes the leg

Question 15

What might you see with a pt. With paralyzed posterior hamstring muscles?

Answer 15

Pt. Will tend to fall forward!

Question 16

What artery supplies the posterior compartment of the thigh?

Answer 16

Perforating branches of the profunda femoris (deep femoral artery)