Lower Limb Muscles Insertion/origin/action

Question 1

Tibialis anterior causes what actions

Answer 1

Dorsiflexion and inversion of foot

Question 2

Tibialis posterior actions ?

Answer 2

Plantarflexion and inversion of foot

Question 3

Which muscles involved in dorsiflexion and eversion of foot ?

Answer 3

Fibularis longus, brevis, tertius

Question 4

3 joints of the ankle

Answer 4

Tibiotalar, subtalar, inferior tibiofibular

Question 5

CONTENTS of tarsal tunnel anterior to posterior

Answer 5

Tom Dick And Very Nervous Harry
Tibialis posterior
Flexor DIgitorum longus
Artery (posterior tibial)
Vein (posterior tibial)
Nerve (tibial)
Flexor HAllucis longus

Question 6

Muscle that can flex hip and extend knee joint

Answer 6

Rectus femoris

Question 7

Action of biceps femoris

Answer 7

Extend hip and flex knee joint

Question 8

Action of sartorius

Answer 8

Flex hip and flex knee joint

Question 9

Action of vastus medialis

Answer 9

Extend knee joint and stabilise patella

Question 10

Muscle that flexes hip joint and no function on knee joint

Answer 10

Psoas major

Question 11

Primary action of vastus group (vastus medialis, lateralis, intermedius) is what ? Why ?

Answer 11

Extension of the knee
By inserting onto the quadriceps tendon and contracting to pull the patella to create knee extension

Question 12

Why can a weak vastus medialis cause patella dislocation ?

Answer 12

Vastus medialis lesser known function = patellar tracking
It inserts both into quadriceps tendon and medial border of patellar.
Prevents patellar from luxation of subluxation laterally during knee loading or with knee flexion.