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Human Structure - Block 2 - Week #5 - Flashcards - JTC > Anterolateral Leg & Dorsum of Foot | B2, WK5 > Flashcards

Anterolateral Leg & Dorsum of Foot | B2, WK5 Flashcards

1
Q

Label A-H [Osteology Review]

A

A: Head of fibula
B: Neck of Fibula
C: Ant. Border of Tibia
D: Lateral Malleolus
E: Medial Malleolus
F: Opening for ant. tibial vessels (in interosseous memb)
G: Metatarsals (1-5)
H: Tuberosity of 5th metatarsals

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2
Q

What is the primary function of the anterior compartment of the leg?

A

Dorsiflexion & inversion
Extension of toes

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3
Q

What is the innervation of the ant. compartment of the leg?

A

Depp fibular N.

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4
Q

What is the primary function of the lateral compartment of the leg?

A

Eversion of foot

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5
Q

What is the innervation of the lateral compartment of the leg?

A

Sup. fibular N.

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6
Q

What is the primary function of the superficial post. compartment of the leg?

A

Plantarflexion of foot

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7
Q

What is the innervation for the posterior compartment of the leg (sup & deep)

A

Tibial N

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8
Q

What is the primary function of the deep post. compartment of the leg

A

Plantarflexion & inversion
Flexion of toes

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9
Q

What are the muscles of the anterior leg? [4]

A
  1. Tibialis anterior
  2. Extensor hallucis long
  3. Extensor digitorum longus
  4. Fibularis tertius
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10
Q

Where does the tibialis anterior arise? insert?

A

Lateral condyle of tibia & interosseous membrane

I: Medial cuneiform & 1st metatarsal

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11
Q

What is the action of the tibialis anterior?

A

Dorsiflexes & inverts the foot

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12
Q

Where does the extensor hallucis longus (EHC) arise? insert?

A

O: anterior fibula & interosseous membrane

I: Distal phalanx fo 1st digit

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13
Q

What is the action of EHC?

A

Extends 1st toe - dorsiflexes foot

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14
Q

Where does the Extensor Digitorum Longus (EDL) arise? insert?

A

O: lat. condyle of tibia, medial fibula, & interosseous membrane

I: insert on middle and distal phalanges of lateral 4 digits

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15
Q

What is the action of the EDL?

A

Extends lateral 4 digits
Dorsiflexes foot

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16
Q

Where does the fibularis tertius arise from? insert?

A

O: inferior fibula & interosseous membrane

I: dorsum of 5th metatarsal

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17
Q

What is the action of the fibularis tertius?

A

Dorsiflexes foot, assists in eversion (sole faces laterally)

18
Q

What is the function of the extensor retinacula?

A

It is a thickened band of crural fascia that prevents bowstringing of extensor tendons as they cross the ankle joint.

19
Q

Name and describe the two parts of the extensor retinacula.

A
  1. Superior extensor retinaculum and inferior extensor retinaculum

Sup: sup to ankle jt, attached to distal tibia & fibula

Inf: Y-shaped, attached laterally to calcaneus, attached medially to medial malleolus and medial side of plantar aponeurosis

20
Q

Describe shin splints

A

Repetitive microtrauma of tibialis ant or tibialis post. causing tears in periosteum

this is a mild compartment syndrome (due to rigidity of deep fascia)

21
Q

What are the two muscles of the lateral leg?

A
  1. Fibularis longus
  2. Fibularis brevis
22
Q

Where does the fibularis longus arise? insert?

A

O: Arises from proximal fibula
I: 1st cuneiform & 1st metatarsal in plantar foot

23
Q

Where does the fibularis brevis arise? insert?

A

O: middle 1/3 of fibula
I: tuberosity of 5th metatarsal

24
Q

What is an avulsion fracture?

A

Fracture that occurs after forceful inversion

25
Q

What are the actions of the lateral leg?

A

Evert foot
Weakly plantarflex foot

26
Q

What does the popliteal artery divide into?

A

anterior and posterior tibial arteries

27
Q

What artery supplies the lateral compartment of the leg?

A

Perforating branches of fibular a.

28
Q

What artery supplies anterior compartment and dorsum of foot?

A

Anterior tibial artery

29
Q

What are the superficial veins of the foot?

A

Dorsal venous arch
Great saphenous v. (from medial side of dorsal vein)
small saphenous v. (from lateral side of dorsal vein)

30
Q

What are the muscles of the dorsum of the foot?

A
  1. Extensor hallucis brevis
  2. Extensor digitorum brevis
31
Q

What is the common origin for the dorsum of the foot muscles?

A

Calcaneus

32
Q

What is the blood supply to the dorsal foot?

A
  1. Dorsal pedis a.
  2. Lateral tarsal a.
  3. Arcuate a.
  4. Deep plantar a.
33
Q

What does the deep plantar a. anastomoses with to form deep plantar arch?

A

Lateral plantar a.

34
Q

Sensory innervation to leg + dorsum of foot:
*Saphenous n =
*Lateral Sural cutaneous n =
*Superficial fibular n =
*Deep fibular n =
*Sural n =

A

*Saphenous n = Medial Leg
*Lateral Sural cutaneous n = Lateral Superior Leg
*Superficial fibular n = Lateral inferior leg and dorsum foot
*Deep fibular n = Between 1st two digits
*Sural n = Lateral toes and lateral posterior leg

35
Q

What are the three branches of the sciatic nerve (lateral division)

A
  1. Lateral sural cutaneous n
  2. Superficial fibular n.
  3. Deep fibular n.
36
Q

What does the Superficial fibular n. innervate? what about sensory?

A

lateral compartment

sensory: anteriolateral leg/ankle/foot

37
Q

What does the deep fibular n. innervate? what about sensory:

A

innervates anterior compartment

Sensory: skin between first two digits

38
Q

Gross anatomy review. Label the following.

A

A: Tibialis Anterior
B: Extensor Digitorum Longus
C: Extensor Hallucis Longus
D: Superior Extensor Retinacula
E: Inferior Extensor Retinacula
F: Fibularis Tertius

39
Q

Gross anatomy review. Label the following

A

A: Fibularis Longus
B: Fibularis Brevis

40
Q

Label the nerves

A

A: Lateral Division of Sciatic N
B: Superficial fibular N
C: Deep fibular N

41
Q

Label the blood supply

A

A: Popliteal A
B: Posterior Tibial A
C: Anterior Tibial A
D: Fibular A

42
Q

Label the blood supply

A

A: Dorsal V. - Great Toe
B: Dorsal V. - 5th Toe
C: Great saphenous vein
D: Small saphenous vein

Human Structure - Block 2 - Week #5 - Flashcards - JTC (7 decks)

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