Compartment Rules of LEs

Question 1

General rules for posterior compartment of thigh (O, N, A)

Answer 1

Posterior Compartment (thigh)

• O: Ischial tuberosity
• N: Tibial n.
• A: Extend hip, flex knee

Question 2

What is the one exception (2) to the rules of the posterior compartment of thigh?

Answer 2

Biceps Femoris, short head

• N: Common Fibular n.
• A: Flex knee only

Question 3

General rules for anterior compartment of thigh (N (1 motor and 2 sensory), A)

Answer 3

Anterior Compartment (thigh)

• N (motor): Femoral n.
• N (sensory): Anterior cutaneous branches, Saphenous
• A: Flex hip, extend knee

Question 4

What are the two exceptions (1, 2) to the rules of the anterior compartment of thigh?

Answer 4

Sartorius
- A: Flex, abduct and laterally rotate hip, and flex knee

Pectineus

• N: Femoral n. AND branch of Obturator n.
• A: Flex hip, adduct hip

Question 5

General rules for medial compartment of thigh (O, N, A)

Answer 5

Medial Compartment (thigh)

• O: Pubis
• N: Obturator n.
• A: Adduct hip

Question 6

What are the three exceptions (2, 1, 1) to the rules of the medial compartment of thigh?

Answer 6

More posteromedial 1/2 of Adductor Magnus (other 1/2 follows normal medial compartment rules)

• N: Tibial n.
• A: Extend hip only

Gracilis
- A: Adduct hip, flex knee

Obturator Externus
- A: Laterally rotate hip only

Question 7

What is the arterial blood supply of the posterior compartment of thigh (2)?

Answer 7

• Deep a. of the thigh (branches into perforating aa.)

- Obturator a.

Question 8

What is the arterial blood supply of the anterior compartment of thigh (2)?

Answer 8

• Femoral a.

- Deep a. of the thigh

Question 9

What is the arterial blood supply of the medial compartment of thigh (3)?

Answer 9

• Femoral a.
• Deep a. of the thigh
• Obturator a.

Question 10

What is the venous blood supply of the posterior compartment of thigh? What does it drain into (2)?

Answer 10

Deep v. of thigh
- Drains into Femoral v. > External Iliac v.

AND

Obturator v.
- Drains into Internal Iliac v.

Question 11

What is the venous blood supply of the anterior compartment of thigh? What does it drain into (2)?

Answer 11

Deep v. of thigh

- Drains into Femoral v. > External Iliac v.

Question 12

What is the venous blood supply of the medial compartment of thigh?

Answer 12

Deep v. of thigh
- Drains into Femoral v. > External Iliac v.

AND

Obturator v.
- Drains into Internal Iliac v.

Question 13

General rules for posterior DEEP compartment of leg (N (1 motor and 1 sensory), A)

Answer 13

Posterior DEEP Compartment (leg)

• N (motor): Tibial n.
• N (sensory): Sural n.
• A: Plantarflex ankle, flex toes

Question 14

What are the two exceptions (1, 1) to the rules of the posterior DEEP compartment of leg?

Answer 14

Tibialis Posterior
- Plantarflex ankle, invert foot

Popliteus
- A: Laterally rotate knee

Question 15

General rules for posterior SUPERFICIAL compartment of leg (N (1 motor and 1 sensory), A)

Answer 15

Posterior SUPERFICIAL Compartment (leg)

• N (motor): Tibial n.
• N (sensory): Sural n.
• A: Plantarflex ankle

Question 16

What is the one exception (1) to the rules of the posterior SUPERFICIAL compartment of leg?

Answer 16

Gastrocnemius

- A: Plantarflex ankle, flex knee

Question 17

General rules for anterior compartment of leg (N (1 motor and 1 sensory), A)

Answer 17

Anterior Compartment (leg)

• N (motor): Deep fibular n.
• N (sensory): Deep fibular n.
• A: Dorsiflex ankle, extend toes

Question 18

What are the two exceptions (1, 1) to the rules of the anterior compartment of leg?

Answer 18

Tibialis Anterior
- A: Dorsiflex ankle, invert foot

Fibularis Tertius
- A: Dorsiflex ankle, evert foot

Question 19

General rules for lateral compartment of leg (N (1 motor and 1 sensory), A)

Answer 19

Lateral Compartment (leg)

• N (motor): Superficial fibular n.
• N (sensory): Superficial fibular n.
• A: Plantar flex ankle, evert foot

Question 20

Are there any exceptions to the lateral compartment of leg?

Answer 20

NOPE :)

Question 21

What is a general rule for naming the foot inventor and foot evertor muscles?

Answer 21

• Foot inventors have “Tibialis” in their name

- Foot evertors have “Fibularis” in their name

Question 22

What are the two motor/sensory nerves of the plantar foot? From what nerve do they originate?

Answer 22

Tibial n. exits the Tarsal Tunnel and splits into:

• Medial Plantar n.
• Lateral Plantar n.

Question 23

Which four muscles receive motor innervation from the Medial Plantar n.? What are the two areas that receive sensory innervation?

Answer 23

Motor:

• Abductor Hallucis
• Flexor Hallucis Brevis
• Flexor Digitorum Brevis
• Lumbrical 1

Sensory:

• Medial aspect of sole of foot
• Tips and plantar aspects of medial 3 1/2 digits

Question 24

Which six muscles are innervated by the Lateral Plantar n. (2 are groups)? What are the two areas that receive sensory innervation?

Answer 24

Motor:

• Adductor Hallucis
• Quadratus Plantae
• Flexor Digiti Minimi Brevis
• Adductor Digiti Minimi
• Lateral 3 Lumbricals
• All Interossei

Sensory:

• Lateral aspect of sole of foot
• Tips and plantar aspect of lateral 1 1/2 digits

Question 25

What are the two arteries of the plantar foot? Which artery do they originate from and what branches do they each give off (2, 3)? Which artery supplies most of the blood of the plantar foot?

Answer 25

Posterior Tibial a. splits into: Medial Plantar a. - Plantar digital aa. - Superficial plantar arch Lateral Plantar a. (supplies most blood of plantar foot) - Plantar digital aa. - Plantar metatarsal aa. - Deep plantar arch

Question 26

What is the venous blood supply of the plantar foot (deep versus superficial)? What do they drain into (2)?

Answer 26

- Deep: accompany aa. and share same names; drain into Fibular v. and Posterior Tibial v. - Superficial: drain into Small saphenous v. and Great Saphenous v.

Question 27

What is the arterial blood supply of the dorsal foot? Which artery does it originate from and what branches does it give off (3)?

Answer 27

Anterior Tibial a. becomes the Dorsalis Pedis a. - branches into: - Arcuate a. - Dorsal Metatarsal aa. - Dorsal Digital aa.

Question 28

What is the arterial blood supply of the dorsal foot? Which artery does it originate from and what branches does it give off (3)?

Answer 28

Anterior Tibial a. becomes the Dorsalis Pedis a. - branches into: - Arcuate a. - Dorsal Metatarsal aa. - Dorsal Digital aa.

Question 29

What is the venous blood supply of the dorsal foot (deep versus superficial)? What does the superficial dorsal foot drain into (2)?

Answer 29

- Deep: accompany aa. and share same names | - Superficial: Dorsal venous arch drains medially into Great Saphenous v. or laterally into Small Saphenous v.