Podcast
Questions and Answers
A weightlifter is performing a bench press. Which muscle is NOT involved in the adduction phase of this exercise?
A weightlifter is performing a bench press. Which muscle is NOT involved in the adduction phase of this exercise?
- Pectoralis Major
- Latissimus Dorsi
- Supraspinatus (correct)
- Subscapularis
A gymnast performs a handstand. Which muscle is primarily responsible for upwardly rotating the scapula to maintain stability?
A gymnast performs a handstand. Which muscle is primarily responsible for upwardly rotating the scapula to maintain stability?
- Serratus Anterior (correct)
- Rhomboids
- Pectoralis Minor
- Latissimus Dorsi
An individual is experiencing difficulty pronating their forearm. Which muscle is MOST likely affected?
An individual is experiencing difficulty pronating their forearm. Which muscle is MOST likely affected?
- Supinator
- Brachialis
- Pronator Teres (correct)
- Brachioradialis
A rock climber reaches overhead to grasp a hold. Which muscle is primarily responsible for the internal rotation of the arm required for this movement?
A rock climber reaches overhead to grasp a hold. Which muscle is primarily responsible for the internal rotation of the arm required for this movement?
A baseball player is throwing a ball. Which muscle is NOT involved in the horizontal adduction of the arm during the throw?
A baseball player is throwing a ball. Which muscle is NOT involved in the horizontal adduction of the arm during the throw?
During a bicep curl exercise, if the forearm is in a neutral (thumbs-up) position, which muscle significantly assists in elbow flexion?
During a bicep curl exercise, if the forearm is in a neutral (thumbs-up) position, which muscle significantly assists in elbow flexion?
A pianist is playing a complex piece. Which muscle is MOST responsible for the isolated flexion of the middle phalanges of the fingers?
A pianist is playing a complex piece. Which muscle is MOST responsible for the isolated flexion of the middle phalanges of the fingers?
If someone is rowing a boat, pulling the oars towards their body, which muscle is NOT primarily involved in the extension phase from a flexed position of the glenohumeral joint?
If someone is rowing a boat, pulling the oars towards their body, which muscle is NOT primarily involved in the extension phase from a flexed position of the glenohumeral joint?
A patient has difficulty extending their fingers at the metacarpophalangeal joints. Which muscle is MOST likely affected?
A patient has difficulty extending their fingers at the metacarpophalangeal joints. Which muscle is MOST likely affected?
During a tennis backhand, which muscle is primarily responsible for radial deviation (abduction) of the wrist?
During a tennis backhand, which muscle is primarily responsible for radial deviation (abduction) of the wrist?
Flashcards
Rhomboids Action
Rhomboids Action
Adduction, elevation, and downward rotation of the scapula. Originates from spinous processes C7-T5, inserts on medial scapular border.
Serratus Anterior Action
Serratus Anterior Action
Abduction and upward rotation of the scapula; originates from ribs 1-9, inserts on the anterior surface of the medial scapular border.
Pectoralis Minor Action
Pectoralis Minor Action
Abduction, depression, and downward rotation of the scapula; originates from ribs 3-5, inserts on the coracoid process of scapula.
Supraspinatus Action
Supraspinatus Action
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Latissimus Dorsi Action
Latissimus Dorsi Action
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Brachialis Action
Brachialis Action
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Brachioradialis Action
Brachioradialis Action
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Pronator Teres Action
Pronator Teres Action
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Supinator Action
Supinator Action
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Extensor Digitorum Action
Extensor Digitorum Action
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Study Notes
Rhomboids
- Originates from the spinous processes of C7-T5.
- Inserts on the medial border of the scapula.
- Responsible for adduction, elevation, and downward rotation of the scapula.
Serratus Anterior
- Originates from ribs 1-9.
- Inserts on the anterior surface of the medial scapular border.
- Causes abduction and upward rotation of the scapula.
Pectoralis Minor
- Originates from ribs 3-5.
- Inserts on the coracoid process of the scapula.
- Causes abduction, depression, and downward rotation of the scapula.
Supraspinatus
- Originates from the supraspinous fossa of the scapula.
- Inserts on the greater tubercle of the humerus.
- Responsible for abduction of the arm at the glenohumeral joint.
Latissimus Dorsi
- Originates from the spinous processes of T6-L5, iliac crest, and ribs 9-12.
- Inserts on the intertubercular groove of the humerus.
- Causes extension, adduction, horizontal abduction, and internal rotation of the arm.
Pectoralis Major
- Originates from the clavicle, sternum, and ribs 1-6.
- Inserts on the intertubercular groove of the humerus.
- Responsible for flexion, adduction, internal rotation, horizontal adduction, abduction, and extension from the flexed position of the arm.
Coracobrachialis
- Originates from the coracoid process of the scapula.
- Inserts on the medial mid-humerus.
- Performs horizontal adduction of the arm.
Subscapularis
- Originates from the subscapular fossa of the scapula.
- Inserts on the lesser tubercle of the humerus.
- Facilitates internal rotation, adduction, and extension of the arm.
Brachialis
- Originates from the distal anterior humerus.
- Inserts on the coronoid process of the ulna.
- Causes elbow flexion.
Brachioradialis
- Originates from the lateral supracondylar ridge of the humerus.
- Inserts on the styloid process of the radius.
- Causes elbow flexion and assists with supination/pronation.
Pronator Teres
- Originates from the medial epicondyle of the humerus and coronoid process of the ulna.
- Inserts on the lateral surface of the radius.
- Causes forearm pronation and weak elbow flexion.
Supinator
- Originates from the lateral epicondyle of the humerus and ulna.
- Inserts on the lateral surface of the radius.
- Causes forearm supination.
Flexor Carpi Radialis
- Originates from the medial epicondyle of the humerus.
- Inserts on the base of the 2nd and 3rd metacarpals.
- Causes wrist flexion and radial deviation.
Flexor Digitorum Superficialis
- Originates from the medial epicondyle of the humerus.
- Inserts on the middle phalanges of fingers 2-5.
- Causes finger and wrist flexion.
Extensor Digitorum
- Originates from the lateral epicondyle of the humerus.
- Inserts on the distal phalanges of fingers 2-5.
- Causes finger and wrist extension.
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Description
Learn about the origins, insertions, and functions of key shoulder muscles, including the rhomboids, serratus anterior, pectoralis minor, supraspinatus, and latissimus dorsi. Understand how these muscles contribute to shoulder movement and stability. Anatomy quick reference.
