Muscles of the Thorax

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Questions and Answers

What are the anterior muscles of the thorax that move the pectoral girdle?

Pectoralis minor, serratus anterior, and subclavius (correct)

Trapezius, rhomboid major, and rhomboid minor

Levator scapulae, pectoralis minor, and subclavius

Latissimus dorsi, serratus anterior, and subclavius

Which muscles originate on the axial skeleton that move the glenohumeral joint/arm?

Deltoid, coracobrachialis, teres major, triceps brachii

Latissimus dorsi, pectoralis major, and biceps brachii (correct)

Levator scapulae, rhomboid major, and rhomboid minor

Rotator cuff muscles

Which muscle is also known as the "swimmer's muscle" due to its action as an agonist of arm extension?

Supraspinatus

Infraspinatus

Teres minor

Latissimus dorsi (correct)

Which muscle is an agonist of arm flexion and also adducts and medially rotates the arm?

Pectoralis major Signup and view all the answers

Which muscle extends and adducts the arm, while the other flexes the arm?

Triceps brachii (long head) and biceps brachii (long head) Signup and view all the answers

Which muscle medially rotates the arm?

Subscapularis Signup and view all the answers

Why is understanding the muscles of the thorax, axial skeleton, and scapula important?

It helps with understanding the movement and function of the upper body Signup and view all the answers

What are the muscles that move the pectoral girdle located in the thorax?

Pectoralis minor, serratus anterior, and subclavius Signup and view all the answers

What are the posterior muscles of the thorax that move the pectoral girdle?

Levator scapulae, rhomboid major, rhomboid minor, and trapezius Signup and view all the answers

Which muscles originate on the scapula and move the glenohumeral joint/arm?

Deltoid, coracobrachialis, teres major, triceps brachii (long head), biceps brachii (long head), and rotator cuff muscles Signup and view all the answers

Which muscle is known as the 'swimmer's muscle'?

Latissimus dorsi Signup and view all the answers

What is the action of the pectoralis major muscle?

Arm flexion and adduction, and medial rotation Signup and view all the answers

Which muscle extends and adducts the arm?

Triceps brachii (long head) Signup and view all the answers

What is the function of the rotator cuff muscles?

Collectively stabilize the glenohumeral joint Signup and view all the answers

Which muscle protracts and depresses the scapula?

Pectoralis Minor Signup and view all the answers

Which muscle is an agonist in scapula protraction and superiorly rotates the scapula?

Serratus Anterior Signup and view all the answers

Which muscle stabilizes and depresses the clavicle?

Subclavius Signup and view all the answers

Study Notes

Muscles of the Thorax, Axial Skeleton, and Scapula

The anterior muscles of the thorax that move the pectoral girdle include the pectoralis minor, serratus anterior, and subclavius.
The posterior muscles of the thorax that move the pectoral girdle include the levator scapulae, rhomboid major, rhomboid minor, and trapezius.
The latissimus dorsi and pectoralis major are muscles originating on the axial skeleton that move the glenohumeral joint/arm.
The deltoid, coracobrachialis, teres major, triceps brachii (long head), biceps brachii (long head), and rotator cuff muscles are muscles originating on the scapula that move the glenohumeral joint/arm.
The deltoid has anterior, middle, and posterior fibers that have different actions on the arm.
The rotator cuff muscles, including the supraspinatus, infraspinatus, teres minor, and subscapularis, collectively stabilize the glenohumeral joint.
The latissimus dorsi is also known as the "swimmer's muscle" due to its action as an agonist of arm extension.
The pectoralis major is an agonist of arm flexion and also adducts and medially rotates the arm.
The triceps brachii (long head) extends and adducts the arm, while the biceps brachii (long head) flexes the arm.
The subscapularis medially rotates the arm, while the supraspinatus abducts the arm, and the infraspinatus and teres minor adduct and laterally rotate the arm.
The origin and insertion points of each muscle are important for understanding their action and how they move the skeletal system.
Understanding the muscles of the thorax, axial skeleton, and scapula is important for understanding the movement and function of the upper body.

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Description

Test your knowledge on the muscles of the thorax, axial skeleton, and scapula with this quiz! Learn about the anterior and posterior muscles of the thorax that move the pectoral girdle, as well as the muscles originating on the axial skeleton and scapula that move the glenohumeral joint/arm. Discover the different actions of muscles like the deltoid, latissimus dorsi, and rotator cuff muscles, and understand the importance of knowing the origin and