Muscles of the Thorax: Interactive Learning Quizzes for Medical Students

Question 1

Which of the following muscles is primarily responsible for elevating the first rib and depressing the hyoid bone?

Accepted Answer

Scalenus anterior

Answer

Sternocleidomastoid

Answer

Platysma

Answer

Trapezius

Question 2

Which of the muscles listed below originates from the sternum and inserts onto the costal cartilages of the lower four ribs?

Accepted Answer

Transversus thoracis

Answer

Rectus abdominis

Answer

External intercostal

Answer

Internal intercostal

Question 3

Which of the muscles listed below is responsible for rotating and laterally flexing the head?

Accepted Answer

Sternocleidomastoid

Answer

Scalenus anterior

Answer

Platysma

Answer

Trapezius

Question 4

Which muscle group lies immediately deep to the external intercostal muscles?

Accepted Answer

Internal intercostal

Answer

Transversus thoracis

Answer

Rectus abdominis

Answer

External oblique

Question 5

Which of the muscles listed below is responsible for elevating and protracting the scapula?

Accepted Answer

Serratus anterior

Answer

Scalenus anterior

Answer

Trapezius

Answer

Sternocleidomastoid

Question 6

Which muscle, located deep to the pectoralis minor, attaches to the coracoid process of the scapula?

Accepted Answer

Subclavius muscle

Answer

Serratus anterior muscle

Answer

Pectoralis major muscle

Answer

Levator scapulae muscle

Question 7

Which muscle is responsible for rotating the scapula upward and laterally?

Accepted Answer

Serratus anterior muscle

Answer

Trapezius muscle

Answer

Rhomboid major muscle

Answer

Pectoralis minor muscle

Question 8

Which layer of the thoracic wall is located most superficially?

Accepted Answer

Skin

Answer

Parietal pleura

Answer

Visceral pleura

Answer

Intercostal fascia

Question 9

During forced expiration, which intercostal muscle layer is most active?

Accepted Answer

External intercostal muscles

Answer

Internal intercostal muscles

Answer

Intercostalis intimus muscle

Answer

Levatores costarum muscle

Question 10

What is the origin of the serratus posterior superior muscle?

Accepted Answer

Vertebral column

Answer

Scapula

Answer

Ribs

Answer

Clavicle

Question 11

Which of the following nerves innervates the intercostal muscles?

Accepted Answer

Intercostal nerves

Answer

Phrenic nerve

Answer

Vagus nerve

Answer

Sympathetic trunk

Question 12

Which muscle is responsible for the outward and upward movement of the ribs during inspiration?

Accepted Answer

Serratus anterior muscle

Answer

Diaphragm

Answer

External intercostal muscle

Answer

Internal intercostal muscle

Question 13

What is the insertion site of the subclavius muscle?

Accepted Answer

Clavicle

Answer

Scapula

Answer

Ribs

Answer

Sternum

Question 14

Which of the following muscles is innervated by the long thoracic nerve?

Accepted Answer

Serratus anterior muscle

Answer

Pectoralis major muscle

Answer

Latissimus dorsi muscle

Answer

Trapezius muscle

Question 15

Which of the following muscles primarily elevates the first two ribs, assisting in inspiration?

Accepted Answer

Scalene anterior

Answer

Rectus abdominis

Answer

External oblique

Answer

Sternocleidomastoid

Question 16

Which nerve is responsible for providing motor innervation to the intercostal muscles?

Accepted Answer

Intercostal nerve

Answer

Phrenic nerve

Answer

Vagus nerve

Answer

Long thoracic nerve

Question 17

Which muscle group is located in the posterior thoracic wall, contributing to movements of the scapula?

Accepted Answer

Rhomboids

Answer

Serratus anterior

Answer

Pectoralis major

Answer

External intercostal

Question 18

Which of the following actions is NOT performed by the serratus anterior muscle?

Accepted Answer

Flexion (bending) of the shoulder joint

Answer

Protraction (forward movement) of the scapula

Answer

Upward rotation of the scapula

Answer

Adduction (medial movement) of the scapula

Question 19

Which of the following is a primary function of the pectoralis major muscle?

Accepted Answer

Adduction (drawing towards the midline) of the arm

Answer

Flexion (bending) of the forearm

Answer

Extension (straightening) of the shoulder joint

Answer

Internal rotation (turning inward) of the arm

Question 20

Which of the following muscles is NOT involved in the process of forced expiration, the forceful expulsion of air from the lungs?

Accepted Answer

Diaphragm

Answer

Internal intercostal muscles

Answer

Rectus abdominis

Answer

External oblique

Question 21

Which thoracic muscle is the primary muscle responsible for inspiration?

Accepted Answer

Diaphragm

Answer

Sternocleidomastoid

Answer

Scalenes

Answer

Intercostals

Question 22

Which nerve is responsible for innervating the serratus anterior muscle?

Accepted Answer

Long thoracic nerve

Answer

Phrenic nerve

Answer

Intercostal nerve

Answer

Brachial plexus

Question 23

Which muscle connects the first three costal cartilages to the clavicle and acromion?

Accepted Answer

Subclavius

Answer

Pectoralis major

Answer

Sternocleidomastoid

Answer

Trapezius

Question 24

Which muscle elevates the ribs during inspiration?

Accepted Answer

External intercostals

Answer

Internal intercostals

Answer

Diaphragm

Answer

Serratus posterior superior

Question 25

Where is the transversus thoracis muscle located?

Accepted Answer

On the inner surface of the posterior ribs

Answer

On the outer surface of the posterior ribs

Answer

Between the internal and external intercostal muscles

Answer

On the inner surface of the sternum

Question 26

Which nerve innervates the diaphragm muscle?

Accepted Answer

Phrenic nerve

Answer

Vagus nerve

Answer

Sympathetic chain

Answer

Intercostal nerves

Question 27

Where does the pectoralis major muscle insert?

Accepted Answer

Humerus

Answer

Clavicle

Answer

Scapula

Answer

Ribs

Question 28

Which muscle of the abdominal wall is involved in respiration, originates from the sternebrae, and inserts onto the xiphoid process?

Accepted Answer

Rectus abdominis

Answer

Sternocleidomastoid

Answer

Transversus abdominis

Answer

External oblique

Question 29

Which nerve innervates the intercostal muscles responsible for respiration?

Accepted Answer

Intercostal nerves

Answer

Phrenic nerve

Answer

Vagus nerve

Answer

Brachial plexus

Question 30

Which muscle group is primarily supplied by the phrenic nerve?

Accepted Answer

Diaphragm

Answer

Intercostal muscles

Answer

Scalenes

Answer

Pectoralis major

Question 31

Which of the following muscles is primarily responsible for expiration via the reduction of thoracic cavity volume?

Accepted Answer

Intercostal muscles

Answer

Diaphragm

Answer

Pectoralis major

Question 32

In which layer of the thoracic wall are the thoracic muscles situated?

Accepted Answer

Fascia endothoracica

Answer

Parietal pleura

Answer

Visceral pleura

Answer

Endosteal layer

Question 33

Which muscle of the thorax is responsible for causing depression of the ribs and innervated by intercostal nerves?

Accepted Answer

Internal intercostal muscle

Answer

Subcostalis muscle

Answer

External intercostal muscle

Answer

Transversus thoracis muscle

Question 34

Which muscle of the thorax receives innervation from the phrenic nerve?

Accepted Answer

Diaphragm

Answer

External intercostal muscle

Answer

Internal intercostal muscle

Question 35

Which of the following muscles is primarily responsible for elevating the ribs during inhalation?

Accepted Answer

External intercostal muscles

Answer

Transversus thoracis muscle

Answer

Internal intercostal muscles

Question 36

Which nerve supplies motor innervation to the serratus anterior muscle?

Accepted Answer

Long thoracic nerve

Answer

Axillary nerve

Answer

Phrenic nerve

Question 37

Which muscle receives its motor innervation from the phrenic nerve?

Accepted Answer

Diaphragm

Answer

External intercostal muscles

Answer

Serratus anterior muscle

Question 38

Which muscle group plays a crucial role in stabilizing the thoracic cage and preventing paradoxical movements?

Accepted Answer

Intercostal muscles

Answer

Serratus posterior superior muscle

Answer

Rectus abdominis muscle

Answer

Transversus abdominis muscle

Question 39

Which of the following muscles is NOT primarily involved in the act of respiration?

Accepted Answer

Pectoralis Major

Answer

Diaphragm

Answer

External Intercostals

Answer

Internal Intercostals

Question 40

The primary action of the scalene muscles during inspiration is to:

Accepted Answer

Elevate the first two ribs

Answer

Increase intra-abdominal pressure

Answer

Depress the ribs

Answer

Expand the thoracic cavity laterally

Question 41

Which of the following muscles is innervated by the thoracodorsal nerve?

Accepted Answer

Latissimus Dorsi

Answer

Trapezius

Answer

Rhomboid Major

Question 42

A patient presents with a winged scapula. Which muscle is most likely affected?

Accepted Answer

Serratus Anterior

Answer

Rhomboid Major

Answer

Trapezius

Answer

Latissimus Dorsi

Question 43

Which of the following muscles is responsible for protracting the scapula?

Accepted Answer

Serratus Anterior

Answer

Rhomboid Major

Answer

Trapezius

Question 44

The primary action of the intercostal muscles is to:

Accepted Answer

Elevate and depress the ribs

Answer

Flex and extend the vertebral column

Answer

Protract and retract the scapula

Answer

Rotate the ribs

Question 45

Which of the following muscles does NOT contribute to movements of the shoulder joint?

Accepted Answer

Internal Intercostals

Answer

Serratus Anterior

Answer

Latissimus Dorsi

Answer

Pectoralis Major

Question 46

The sternocleidomastoid muscle originates from the manubrium and clavicle. Where does it insert, and what is its primary action?

Accepted Answer

Mastoid process; rotates the head to the opposite side

Answer

Scapula; elevates and retracts the shoulder

Answer

Clavicle; stabilizes the shoulder joint

Answer

Ribs; elevates the rib cage during inspiration

Question 47

Which of the following muscles is NOT considered a primary muscle of forced inspiration?

Accepted Answer

Internal Intercostals

Answer

External Intercostals

Answer

Scalenes

Answer

Diaphragm

Question 48

A patient presents with difficulty in elevating the scapula and rotating it upward. Which muscle is most likely affected?

Accepted Answer

Trapezius

Answer

Serratus Anterior

Answer

Latissimus Dorsi

Answer

Rhomboid Major

Question 49

The diaphragm, the primary muscle of respiration, is innervated by which nerve?

Accepted Answer

Phrenic Nerve

Answer

Intercostal Nerves

Answer

Accessory Nerve

Answer

Long Thoracic Nerve

Question 50

What is the primary function of the serratus anterior muscle?

Accepted Answer

Protract and rotate the scapula upward

Answer

Depress the scapula

Answer

Adduct the scapula

Answer

Extend the shoulder joint

Question 51

Which muscle, along with the pectoralis major, forms the anterior axillary fold?

Accepted Answer

Pectoralis Minor

Answer

Latissimus Dorsi

Answer

Serratus Anterior

Answer

Subclavius

Question 52

A patient exhibits weakness in adducting and medially rotating the arm. Which muscle is most likely affected?

Accepted Answer

Latissimus Dorsi

Answer

Pectoralis Minor

Answer

Rhomboid Major

Answer

Trapezius

Question 53

The internal intercostal muscles play a crucial role in which respiratory action?

Accepted Answer

Forced expiration

Answer

Depression of the scapula

Answer

Elevation of the ribs

Answer

Forced inspiration

Question 54

Which of the following muscles is NOT directly involved in shoulder joint movement?

Accepted Answer

Diaphragm

Answer

Trapezius

Answer

Latissimus Dorsi

Answer

Pectoralis Major

Question 55

A patient presents with a winged scapula, indicating paralysis of the serratus anterior muscle. Which nerve is likely affected?

Accepted Answer

Long Thoracic Nerve

Answer

Thoracodorsal Nerve

Answer

Suprascapular Nerve

Answer

Dorsal Scapular Nerve