1.13 Leg

Question 1

Why does popliteal fossa have so much fatty packing material?

Answer 1

to prevent strangulation of vessels and nerves when squatting

Question 2

The sciatic nerve diverges into what 2 nerves at the popliteal fossa?

Answer 2

tibial and fibular nerve

Question 3

Drainage of medial side of leg?

Answer 3

great saphenous vein

Question 4

Drainage of lateral foot and plantar skin?

Answer 4

small saphenous vein

Question 5

• origin: lateral condyle, interossues membrane
• inserts: base of 1st metatarsal
• dorsiflexes foot at ankle, inverts foot

Answer 5

tibialis anterior

Question 6

• origin: lateral epicondyle of tibia, interosseus membrane
• inserts: middle and distal phalanges of lateral 4 digits
• extends lateral 4 digits and dorsiflexes foot at ankle

Answer 6

extensor digitorum longus

Question 7

• origin: middle part of anterior fibula and interosseus membrane
• inserts: dorsal aspect of base of distal phalanx of great toe
• extends great toe, dorsiflexes foot at ankle

Answer 7

extensor hallicus longus

Question 8

evertor of lateral foot, tendon reaches base of 5th metatarsal

Answer 8

fibularis tertius

Question 9

Function of anterior compartment muscles?

Answer 9

dorsiflexion,

Question 10

origin: head and proximal 2/3 of lateral fibula
inserts: plantar base of 1st metatarsal and medial cuneiform
- everts foot weakly and plantarflexes foot at ankle

Answer 10

fibularis longus

Question 11

origin: lateral surface of fibula
inserts: dorsal surface of tuberosity on lateral side of 5th metatarsal
- everts foot weakly and plantarflexes foot at ankle

Answer 11

fibularis brevis

Question 12

Loss of common fibular nerve leads to what injury?

Answer 12

“drop foot” gait

Question 13

• origin: lateral head on lateral condyle of femur, medial head on popliteal surface above medial condyle of femur
• insertion: post calcaneus
• plantarflexes foot at ankle joint, flexion of knee, raises heel during walking

Answer 13

gastrocnemius

Question 14

origin: post aspect of head of fibula
inserts: post calcaneus
action: plantarflexes foot at ankle, stabilizes leg over foot

Answer 14

soleus muscle

Question 15

• origin: posterior fibula
• inserts: base of distal phalanx of great toe
• flexes all joints of great toe, weakly plantarflexes foot at ankle

Answer 15

flexor hallucis longus

Question 16

• origin: posterior tibia
• insertion: plantar bases of distal phalnages of lateral 4 digits
• flexes lateral 4 digits, plantarflexes foot at ankle, supports longitudinal arches of foot

Answer 16

flexor digitorum longus

Question 17

• origin: interosseus membrane
• inserts: attaches to all tarsals except talus
• high pressure a big issue b/c surrounded by rigid structures, plantarflexes foot at ankle and inverts foot

Answer 17

tibialis posterior