Question 1

A patient presents with difficulty blinking and closing their eyes, leading to dryness and irritation. Which muscle is most likely impaired?

Accepted Answer

Orbicularis oculi

Question 2

Which muscle is primarily responsible for the action described by the equation $$	ext{Arm Abduction} = 	ext{Deltoid Activation}$$?

Accepted Answer

Deltoid

Question 3

A baseball pitcher suffers a tear in the muscle that assists in abduction of the humerus and stabilizes the shoulder. Which muscle is most likely injured?

Accepted Answer

Supraspinatus

Question 4

During a neurological exam, a patient is unable to flex their forearm or supinate their hand. Which muscle is most likely affected?

Accepted Answer

Biceps brachii

Question 5

Which muscle is responsible for the action described by the equation $$	ext{Wrist Flexion} + 	ext{Hand Abduction} = 	ext{Flexor Carpi Radialis}$$?

Accepted Answer

Flexor carpi radialis

Question 6

A patient is unable to extend their knee but can still flex their thigh at the hip. Which muscle is most likely partially functioning?

Accepted Answer

Rectus femoris

Question 7

Which muscle is the prime mover of arm extension, and also adducts and medially rotates the arm?

Accepted Answer

Latissimus dorsi

Question 8

A runner complains of pain when pushing off with their great toe during walking. Which muscle is most likely involved?

Accepted Answer

Flexor hallucis longus

Question 9

Which muscle is responsible for the action described by the equation $$	ext{Hip Flexion} = 	ext{Iliopsoas Activation}$$?

Accepted Answer

Iliopsoas

Question 10

A patient is unable to dorsiflex and invert their foot, resulting in a 'foot drop.' Which muscle is most likely paralyzed?

Accepted Answer

Tibialis anterior

Question 11

Which muscle is primarily responsible for closing the jaw and elevating the mandible?

Accepted Answer

Masseter

Question 12

A patient presents with difficulty smiling, specifically in raising the lateral corners of the mouth. Which muscle is most likely affected?

Accepted Answer

Zygomaticus

Question 13

Which muscle is responsible for the action described by the equation $$	ext{Knee Extension} = 	ext{Vastus Lateralis Activation}$$?

Accepted Answer

Vastus lateralis

Question 14

A patient is unable to extend their fingers but can still flex their wrist. Which muscle is most likely impaired?

Accepted Answer

Extensor digitorum

Question 15

Which muscle is responsible for plantarflexion and eversion of the foot, as described by the equation $$	ext{Plantarflexion} + 	ext{Eversion} = 	ext{Fibularis Longus}$$?

Accepted Answer

Fibularis longus

Question 16

A patient is unable to flex their toes and invert their foot. Which muscle is most likely affected?

Accepted Answer

Flexor digitorum longus

Question 17

Which muscle is responsible for the action described by the equation $$	ext{Trunk Flexion} + 	ext{Rib Depression} + 	ext{Pelvis Stabilization} = 	ext{Rectus Abdominis}$$?

Accepted Answer

Rectus abdominis

Question 18

A patient is unable to extend their forearm but can still flex it. Which muscle is most likely impaired?

Accepted Answer

Triceps brachii

Question 19

Which muscle is responsible for the action described by the equation $$	ext{Head Extension} + 	ext{Scapula Elevation/Depression} = 	ext{Trapezius}$$?

Accepted Answer

Trapezius

Question 20

A patient is unable to flex and laterally rotate their thigh, making it difficult to sit cross-legged. Which muscle is most likely impaired?

Accepted Answer

Sartorius

Human Muscles: Identification and Actions – Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards