Podcast
Questions and Answers
Which action is primarily performed by the upper fibers of the trapezius?
Which action is primarily performed by the upper fibers of the trapezius?
Which nerve is associated with the serratus anterior muscle?
Which nerve is associated with the serratus anterior muscle?
What is the primary action of the levator scapulae muscle?
What is the primary action of the levator scapulae muscle?
Which of the following muscles is involved in the retraction of the shoulder?
Which of the following muscles is involved in the retraction of the shoulder?
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Which action does the pectoralis minor contribute to?
Which action does the pectoralis minor contribute to?
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What is the action of the middle fibers of the trapezius?
What is the action of the middle fibers of the trapezius?
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Which of these nerves innervates the musculature responsible for winging of the scapula?
Which of these nerves innervates the musculature responsible for winging of the scapula?
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Which muscle is primarily responsible for the protraction of the shoulder?
Which muscle is primarily responsible for the protraction of the shoulder?
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Which muscle is primarily responsible for lateral rotation of the arm?
Which muscle is primarily responsible for lateral rotation of the arm?
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Which nerve innervates the muscle responsible for shoulder abduction?
Which nerve innervates the muscle responsible for shoulder abduction?
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What condition results from damage to the radial nerve?
What condition results from damage to the radial nerve?
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In which action is the upper and lower trapezius primarily involved?
In which action is the upper and lower trapezius primarily involved?
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Which muscle is known to assist in medial rotation of the arm?
Which muscle is known to assist in medial rotation of the arm?
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Which muscle is associated with winging of the scapula?
Which muscle is associated with winging of the scapula?
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Which nerve is associated with the function of the teres major muscle?
Which nerve is associated with the function of the teres major muscle?
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Which muscle is NOT involved in shoulder adduction?
Which muscle is NOT involved in shoulder adduction?
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Which muscle is responsible for the elevation of the scapula?
Which muscle is responsible for the elevation of the scapula?
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Which nerve supplies the levator scapulae muscle?
Which nerve supplies the levator scapulae muscle?
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What is the effect of an injury to the accessory nerve?
What is the effect of an injury to the accessory nerve?
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Which movement is produced by the pectoralis minor muscle?
Which movement is produced by the pectoralis minor muscle?
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Which of the following conditions could result from a rupture of the biceps tendon?
Which of the following conditions could result from a rupture of the biceps tendon?
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Radial head dislocation is commonly known as what?
Radial head dislocation is commonly known as what?
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What effect does nerve injury have on muscle function in the upper limb?
What effect does nerve injury have on muscle function in the upper limb?
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Which of the following muscles would be affected in a lesion of the medial pectoral nerve?
Which of the following muscles would be affected in a lesion of the medial pectoral nerve?
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Which nerve primarily innervates the Deltoid muscle?
Which nerve primarily innervates the Deltoid muscle?
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What is the primary action of the Pectoralis Major muscle?
What is the primary action of the Pectoralis Major muscle?
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Which muscle action is primarily associated with the Subscapularis?
Which muscle action is primarily associated with the Subscapularis?
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Which muscles are appropriately paired with their shoulder actions?
Which muscles are appropriately paired with their shoulder actions?
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Which of the following muscles is NOT responsible for internal rotation of the arm?
Which of the following muscles is NOT responsible for internal rotation of the arm?
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What is the primary action of the Latissimus Dorsi muscle?
What is the primary action of the Latissimus Dorsi muscle?
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Which action is primarily associated with the Middle fibers of the Deltoid?
Which action is primarily associated with the Middle fibers of the Deltoid?
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The actions of the Deltoid muscle can be divided into specific fiber contributions. Which part is responsible for the posterior fibers?
The actions of the Deltoid muscle can be divided into specific fiber contributions. Which part is responsible for the posterior fibers?
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Which muscle is NOT involved in the flexion movement at the wrist joint?
Which muscle is NOT involved in the flexion movement at the wrist joint?
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What muscle group primarily assists with the extension of the wrist joint?
What muscle group primarily assists with the extension of the wrist joint?
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Which of the following muscles is involved in the abduction of the thumb at the carpo-metacarpal joint?
Which of the following muscles is involved in the abduction of the thumb at the carpo-metacarpal joint?
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Which muscle is primarily responsible for opposition of the thumb?
Which muscle is primarily responsible for opposition of the thumb?
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Which of these muscles assists in adduction at the carpo-metacarpal joint?
Which of these muscles assists in adduction at the carpo-metacarpal joint?
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Which muscle is NOT an extensor of the wrist joint?
Which muscle is NOT an extensor of the wrist joint?
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Which of the following muscles contributes to the flexion of the thumb at the metacarpo-phalangeal joint?
Which of the following muscles contributes to the flexion of the thumb at the metacarpo-phalangeal joint?
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Which muscle assists with the movement of the thumb's abduction and is located at the carpo-metacarpal joint?
Which muscle assists with the movement of the thumb's abduction and is located at the carpo-metacarpal joint?
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Study Notes
Movements of Shoulder Girdle
-
Elevation of the scapula (Elevation of the Shoulder)
- Muscles: Upper fibers of Trapezius, Levator scapulae
- Nerve Supply: Cranial Accessory (11th), Dorsal Scapular nerve
-
Depression of the scapula (Depression of the Shoulder)
- Muscles: Upper fibers of Trapezius, Pectoralis minor
- Nerve Supply: Cranial Accessory (11th), Medial Pectoral Nerve
-
Upward rotation of the scapula (Abduction, Raising the arm above the head)
- Muscles: Upper fibers of Trapezius, Lower fibers of Trapezius, Lower digitations of serratus anterior
- Nerve Supply: Cranial Accessory (11th), Long Thoracic Nerve
- Effect of Lesion: Winging of Scapula
-
Downward rotation of the scapula
- Muscles: Levator scapulae, Rhomboideus major and minor, Pectoralis minor
- Nerve Supply: Dorsal Scapular nerve, Medial Pectoral Nerve
-
Protraction (Movement of the shoulder forward)
- Muscles: Serratus anterior, Pectoralis minor
- Nerve Supply: Long Thoracic Nerve, Medial Pectoral Nerve
-
Retraction (Movement of the shoulder backward)
- Muscles: Middle fibers of trapezius, Rhomboideus major and minor
- Nerve Supply: Cranial Accessory (11th), Dorsal Scapular nerve
Actions of Trapezius
- Elevates scapula, rotates scapula upward, adducts scapula (draws scapula toward the vertebral column), depresses scapula
Actions of Levator Scapulae
- Elevates the Scapula
Actions of Rhomboidei
- Retract and stabilize the scapula, rotate it downward
Actions of Serratus Anterior
- Protracts and rotates the scapula upward, stabilizes the scapula against the chest wall, assists in breathing
Actions of Pectoralis Major
- Adducts, flexes, medially rotates the arm at the shoulder joint, assists in respiration, draws arm across the chest, depresses the shoulder
Actions of Subscapularis
- Medially rotates the arm at the shoulder joint, helps to stabilize the shoulder joint, prevents lateral rotation, pulls the arm into the body
Actions of Latissimus Dorsi
- Extends, adducts, and medially rotates the arm at the shoulder joint, pulls the arm downward and backward
Actions of Deltoid
- Abducts (middle fibers), Flexes and medially rotates (anterior fibers), Extends and laterally rotates (posterior fibers) the arm at the shoulder joint
- Effect of Lesion: Flat Shoulder
Actions of Supraspinatus
- Abducts the arm at the shoulder joint, helps to stabilize the shoulder joint
- Effect of Lesion: Flat Shoulder
Actions of Infraspinatus
- Laterally rotates the arm at the shoulder joint, helps to stabilize the shoulder joint
Actions of Teres Minor
- Laterally rotates the arm at the shoulder joint, helps to stabilize the shoulder joint
Movements of Wrist Joint
-
Flexion
- Muscles: Flexor carpi radialis, Flexor carpi ulnaris, Palmaris longus, Flexor digitorum superficialis, Flexor digitorum profundus, Flexor pollicis longus
- Assisted by: Extensor digitorum, Extensor carpi radialis longus, Extensor indicis
-
Extension
- Muscles: Extensor carpi radialis longus, Extensor carpi radialis brevis, Extensor digiti minimi, Extensor carpi ulnaris, Extensor pollicis longus
- Assisted by: Flexor carpi ulnaris, Flexor carpi radialis
-
Adduction
- Muscles: Flexor carpi ulnaris, Extensor carpi ulnaris
-
Abduction
- Muscles: Extensor carpi radialis longus and brevis, Flexor carpi radialis
- Assisted by: Abductor pollicis longus, Extensor pollicis longus and brevis
Movements of 1st Carpo-Metacarpal (CMJ) & Metacarpo-phalangeal (MCPJ) Joints
-
Flexion (MCPJ)
- Muscles: Flexor pollicis brevis and longus, Opponens pollicis
-
Extension (MCPJ)
- Muscles: Extensor pollicis longus, Extensor pollicis brevis
-
Adduction (CMJ)
- Muscles: Adductor pollicis, 1st palmar interossoeus
-
Abduction (CMJ)
- Muscles: Abductor pollicis longus, Abductor pollicis brevis
-
Opposition (medial rotation of thumb)
- Muscles: Opponens pollicis
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Description
Test your knowledge on the movements of the shoulder girdle, including elevation, depression, rotation, and protraction of the scapula. This quiz covers the muscles involved, nerve supply, and effects of lesions. Perfect for students of anatomy and physiology!
