Question 1

Which muscle is primarily responsible for extension at the elbow joint?

Accepted Answer

Triceps brachii

Question 2

A patient presents with weak elbow extension and inability to extend the wrist or fingers. Which nerve is most likely injured?

Accepted Answer

Radial nerve

Question 3

Which muscles are involved in dorsiflexion of the ankle?

Accepted Answer

Tibialis anterior, extensor hallucis longus, extensor digitorum longus

Question 4

Which nerve supplies the muscles responsible for plantarflexion at the ankle?

Accepted Answer

Tibial nerve

Question 5

If the deep fibular (peroneal) nerve is injured, which movement at the ankle would be most affected?

Accepted Answer

Dorsiflexion

Question 6

Which of the following muscles is NOT involved in flexion at the elbow?

Accepted Answer

Triceps brachii

Question 7

A fracture above the elbow can injure which nerve, leading to weak grip and inability to extend the wrist?

Accepted Answer

Radial nerve

Question 8

Which equation best represents the relationship between force ($$F$$), muscle cross-sectional area ($$A$$), and muscle tension ($$T$$)?

Accepted Answer

$$F = T 	imes A$$

Question 9

During sleep, prolonged pressure on the spiral groove of the humerus can cause which clinical condition?

Accepted Answer

Saturday night palsy

Question 10

Which nerve innervates the brachioradialis muscle?

Accepted Answer

Radial nerve

Question 11

Which movement at the elbow is impaired if the triceps brachii fails?

Accepted Answer

Extension

Question 12

Which of the following is a probable outcome of radial nerve injury at the elbow?

Accepted Answer

Elbow extension is weak and wrist drop occurs

Question 13

Which muscle is NOT involved in dorsiflexion of the ankle?

Accepted Answer

Gastrocnemius

Question 14

Which nerve is responsible for innervating the muscles that perform elbow flexion?

Accepted Answer

Musculocutaneous nerve

Question 15

Which equation describes the torque ($$	au) $$produced by a muscle acting at a joint, given force ($$F) $$and lever arm ($$r$$)?

Accepted Answer

$$	au = F 	imes r$$

Question 16

Which muscle group is primarily responsible for plantarflexion at the ankle?

Accepted Answer

Gastrocnemius, soleus, tibialis posterior

Question 17

A patient cannot extend their wrist or fingers after a humeral fracture. Which muscle group is most affected?

Accepted Answer

Extensors of the forearm

Question 18

Which nerve injury would most likely result in loss of plantarflexion?

Accepted Answer

Tibial nerve

Question 19

Which of the following is a real-life scenario that could lead to radial nerve injury?

Accepted Answer

Prolonged pressure on the spiral groove of the humerus during deep sleep

Question 20

Which muscle is NOT involved in extension at the elbow?

Accepted Answer

Biceps brachii

Muscles, Movements, and Nerve Supply of the Upper and Lower Limbs

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