Question 1

A patient is unable to elevate their scapula after a neck injury. Which muscle is most likely affected?

Accepted Answer

Levator scapulae

Question 2

Which muscle is primarily responsible for closing the eyelids?

Accepted Answer

Orbicularis oculi

Question 3

A baseball pitcher suffers a tear in the muscle that abducts the shoulder and originates on the supraspinous fossa. Which muscle is injured?

Accepted Answer

Supraspinatus

Question 4

Which muscle is responsible for flexing the hip and originates on the iliac fossa?

Accepted Answer

Iliacus

Question 5

During inspiration, which muscle contracts to flatten and increase the volume of the thoracic cavity?

Accepted Answer

Diaphragm

Question 6

A patient presents with difficulty flexing their elbow. Which muscle is LEAST likely to be involved?

Accepted Answer

Triceps brachii

Question 7

Which muscle is responsible for plantarflexion of the ankle and originates on the lateral condyle of the femur?

Accepted Answer

Gastrocnemius

Question 8

If a person cannot abduct their thumb, which muscle is most likely paralyzed?

Accepted Answer

Abductor pollicis longus

Question 9

Which muscle is involved in both flexion and lateral rotation of the hip, and also flexes the knee?

Accepted Answer

Sartorius

Question 10

A patient is unable to compress their cheeks while blowing a trumpet. Which muscle is most likely impaired?

Accepted Answer

Buccinator

Question 11

Which muscle group is primarily responsible for extending the vertebral column?

Accepted Answer

Erector spinae

Question 12

Which muscle is the main abductor of the shoulder and inserts on the deltoid tuberosity?

Accepted Answer

Deltoid

Question 13

A patient has difficulty elevating the mandible to close their mouth. Which muscle is most likely weakened?

Accepted Answer

Temporalis

Question 14

Which muscle is responsible for compressing the abdominal cavity and originates on the iliac crest and thoracolumbar fascia?

Accepted Answer

Transversus abdominis

Question 15

Which muscle is responsible for flexing the wrist and originates on the medial epicondyle of the humerus?

Accepted Answer

Flexor carpi radialis

Question 16

A patient cannot extend their knee after a femoral nerve injury. Which muscle group is most likely paralyzed?

Accepted Answer

Quadriceps femoris group

Question 17

Which muscle is responsible for adducting the shoulder and originates on the spinous processes of the lower thoracic vertebrae?

Accepted Answer

Latissimus dorsi

Question 18

Which muscle is responsible for dorsiflexion of the ankle and originates on the lateral condyle of the tibia?

Accepted Answer

Tibialis anterior

Question 19

A patient is unable to laterally rotate their hip. Which muscle is most likely affected?

Accepted Answer

Piriformis

Question 20

Which muscle is responsible for elevating the upper eyelid and originates on the lesser wing of the sphenoid bone?

Accepted Answer

Levator palpebrae superioris

Muscle Classification and Major Skeletal Muscles: Structure, Function, and Origins/Insertions

Study Guide - Practice Questions