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Questions and Answers
What is the primary action performed by the supraspinatus muscle in relation to the glenohumeral joint?
What is the primary action performed by the supraspinatus muscle in relation to the glenohumeral joint?
Which muscle originates from the infraspinous fossa and is responsible for external rotation of the glenohumeral joint?
Which muscle originates from the infraspinous fossa and is responsible for external rotation of the glenohumeral joint?
Which of the following statements is true regarding the pectoralis major muscle?
Which of the following statements is true regarding the pectoralis major muscle?
What is the insertion point of the teres minor muscle?
What is the insertion point of the teres minor muscle?
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Which muscle is primarily responsible for internal rotation, adduction, and extension of the glenohumeral joint?
Which muscle is primarily responsible for internal rotation, adduction, and extension of the glenohumeral joint?
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Which muscle is responsible for flexion of the distal interphalangeal joint?
Which muscle is responsible for flexion of the distal interphalangeal joint?
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What is the primary action of the pronator quadratus?
What is the primary action of the pronator quadratus?
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Where does the flexor pollicis longus originate?
Where does the flexor pollicis longus originate?
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Which statement accurately describes the extensor-supinator muscles?
Which statement accurately describes the extensor-supinator muscles?
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What keeps the extensor tendons in place at the posterior aspect of the forearm?
What keeps the extensor tendons in place at the posterior aspect of the forearm?
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Which muscle originates from the spinous process of T6 to the crest of the ilium?
Which muscle originates from the spinous process of T6 to the crest of the ilium?
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What action does the flexor carpi radialis perform?
What action does the flexor carpi radialis perform?
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Which of the following is not a motor muscle of supination?
Which of the following is not a motor muscle of supination?
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Where does the palmaris longus insert?
Where does the palmaris longus insert?
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What is the primary action of the flexor digitorum superficialis?
What is the primary action of the flexor digitorum superficialis?
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Which muscle is responsible for scapular depression?
Which muscle is responsible for scapular depression?
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Which of the following is part of the superficial layer of flexor-pronator muscles?
Which of the following is part of the superficial layer of flexor-pronator muscles?
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What origin do most flexor muscles share?
What origin do most flexor muscles share?
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What is the primary function of the serratus anterior muscle?
What is the primary function of the serratus anterior muscle?
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Which ligament connects the medial aspect of the scaphoid bone with the lateral aspect of the lunate bone?
Which ligament connects the medial aspect of the scaphoid bone with the lateral aspect of the lunate bone?
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Which component of the trapezius is responsible for upward rotation of the scapula?
Which component of the trapezius is responsible for upward rotation of the scapula?
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Which muscle primarily performs depression of the scapula?
Which muscle primarily performs depression of the scapula?
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Where does the levator scapulae muscle originate?
Where does the levator scapulae muscle originate?
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What is the insertion point of the deltoid muscle?
What is the insertion point of the deltoid muscle?
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The rhomboid major and minor muscles are responsible for which action?
The rhomboid major and minor muscles are responsible for which action?
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Which of the following muscles does NOT originate from the spine or transverse processes?
Which of the following muscles does NOT originate from the spine or transverse processes?
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Which extensor muscle originates from the posterior surface of the ulna?
Which extensor muscle originates from the posterior surface of the ulna?
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What is the primary action of the extensor carpi radialis longus?
What is the primary action of the extensor carpi radialis longus?
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Which extensor muscle is responsible for the independent extension of the pinky?
Which extensor muscle is responsible for the independent extension of the pinky?
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Where does the extensor carpi ulnaris insert?
Where does the extensor carpi ulnaris insert?
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The action performed by the supinator muscle is primarily what?
The action performed by the supinator muscle is primarily what?
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Which extensor muscle is responsible for the extension of the thumb only at the metacarpophalangeal joint?
Which extensor muscle is responsible for the extension of the thumb only at the metacarpophalangeal joint?
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What is the common origin point for the extensor digitorum and extensor digiti minimi?
What is the common origin point for the extensor digitorum and extensor digiti minimi?
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Which muscle aids in the extension of the second digit while allowing for hand extension?
Which muscle aids in the extension of the second digit while allowing for hand extension?
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What is the insertion point for the brachioradialis muscle?
What is the insertion point for the brachioradialis muscle?
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Which extensor muscle primarily performs the action of abduction of the thumb?
Which extensor muscle primarily performs the action of abduction of the thumb?
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Which bone is not part of the radio-carpal joint but plays a role in the carpal structure?
Which bone is not part of the radio-carpal joint but plays a role in the carpal structure?
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What is the arrangement from lateral to medial of the bones that form the distal surface of the radio-carpal joint?
What is the arrangement from lateral to medial of the bones that form the distal surface of the radio-carpal joint?
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Which carpal bone articulates distally with the first metacarpal bone?
Which carpal bone articulates distally with the first metacarpal bone?
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Identify the largest carpal bone among the following options.
Identify the largest carpal bone among the following options.
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Which of the following joints is particularly vulnerable to arthritis due to its articulating connections?
Which of the following joints is particularly vulnerable to arthritis due to its articulating connections?
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Which of the following describes the articulation relations of the triquetrum bone?
Which of the following describes the articulation relations of the triquetrum bone?
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Which interosseous ligament connects the two rows of carpal bones?
Which interosseous ligament connects the two rows of carpal bones?
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What is the relationship of the scaphoid bone with the trapezium and trapezoid?
What is the relationship of the scaphoid bone with the trapezium and trapezoid?
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What is the primary function of the triangular fibrocartilage complex (TFCC) in the wrist joint?
What is the primary function of the triangular fibrocartilage complex (TFCC) in the wrist joint?
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Which statement accurately describes the function of the collateral ligaments in the wrist?
Which statement accurately describes the function of the collateral ligaments in the wrist?
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Which component of the TFCC inserts into the lunate and triquetrum, providing crucial stabilization?
Which component of the TFCC inserts into the lunate and triquetrum, providing crucial stabilization?
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The medial or ulnar collateral ligament (UCL) provides support to which anatomical structures?
The medial or ulnar collateral ligament (UCL) provides support to which anatomical structures?
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What type of joint mechanics does the triangular fibrocartilage complex (TFCC) facilitate during wrist movements?
What type of joint mechanics does the triangular fibrocartilage complex (TFCC) facilitate during wrist movements?
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In which common activity do TFCC lesions frequently occur, leading to pain and movement limitations?
In which common activity do TFCC lesions frequently occur, leading to pain and movement limitations?
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The radial collateral ligament (RCL) primarily supports movement in which direction?
The radial collateral ligament (RCL) primarily supports movement in which direction?
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What role does the triangular fibrocartilage complex (TFCC) play in relation to the radioulnar joint?
What role does the triangular fibrocartilage complex (TFCC) play in relation to the radioulnar joint?
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Which action is primarily facilitated by the superior radioulnar joint?
Which action is primarily facilitated by the superior radioulnar joint?
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Which of the following is a characteristic of the true elbow joint?
Which of the following is a characteristic of the true elbow joint?
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What is the role of the olecranon fossa in the elbow joint?
What is the role of the olecranon fossa in the elbow joint?
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The complex formed by the trochlea and capitellum allows movement primarily in which direction?
The complex formed by the trochlea and capitellum allows movement primarily in which direction?
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Which of the following bones does NOT directly participate in the formation of the true elbow joint?
Which of the following bones does NOT directly participate in the formation of the true elbow joint?
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What type of joint is the proximal radioulnar joint classified as?
What type of joint is the proximal radioulnar joint classified as?
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Which structure on the ulna articulates directly with the distal humerus during elbow flexion?
Which structure on the ulna articulates directly with the distal humerus during elbow flexion?
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What is the main purpose of the distal radioulnar joint?
What is the main purpose of the distal radioulnar joint?
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Study Notes
Ligaments of the Metacarpal Joint
- The metacarpal joint is formed by 8 bones: scaphoid, lunate, triquetrum, pisiform, trapezium, trapezoid, capitate, and hamate.
- Ligaments connect these bones, for example, the scapho-lunate ligament connects the scaphoid to the lunate.
Muscles from Trunk to Shoulder Girdle
-
Serratus Anterior:
- Originates from ribs 1-9.
- Inserts into the medial border of the scapula.
- Abducts and upwardly rotates the scapula.
-
Trapezius:
- Has 3 components: descending, transverse, and ascending.
- Originates from the occipital bone and spinous processes of C7-T12.
- Inserts into the acromion and spine of the scapula.
- Abducts, downwardly rotates, and elevates/depresses the scapula.
-
Rhomboid Minor and Major:
- Originate from spinous processes C5-T4 and nuchal ligament.
- Inserts into medial border of scapula.
- Adduct, downwardly rotate, and elevate the scapula.
-
Pectoralis Minor:
- Originates from ribs 2-5.
- Inserts into the coracoid process of the scapula.
- Depresses and ventral tilts scapula, elevating ribs 2-5.
-
Levator Scapulae:
- Originates from upper cervical vertebrae transverse processes.
- Inserts into superior medial border of scapula (above rhomboids).
- Elevates and downwardly rotates the scapula, flexes and laterally rotates the head.
Muscles from Shoulder Girdle to Humerus
-
Deltoid:
- 3 components originating from spine of scapula, acromion, and clavicle.
- Inserts into deltoid tuberosity of humerus.
- Abducts the glenohumeral joint. Clavicular part flexes, spinal part extends.
-
Supraspinatus:
- Originates from the supraspinous fossa.
- Inserts into the greater tubercle of the humerus.
- Abducts the glenohumeral joint.
-
Infraspinatus:
- Originates from infraspinous fossa.
- Inserts into the greater tubercle of the humerus.
- Externally rotates the glenohumeral joint.
-
Teres Minor:
- Originates from lateral border of scapula.
- Inserts into the greater tubercle of the humerus.
- Externally rotates the glenohumeral joint.
-
Subscapularis:
- Originates from subscapular fossa.
- Inserts into the lesser tubercle of the humerus.
- Internally rotates the glenohumeral joint (also, adducts, extends, and flexes).
-
Teres Major:
- Originates from the inferior angle of the scapula.
- Inserts into the crest of the lesser tubercle of the humerus.
- Internally rotates, adducts, and extends the glenohumeral joint.
-
Pectoralis Major:
- Originates from ribs 2-7, sternum, and scapula.
- Inserts into the crest of the greater tubercle of the humerus.
- Adducts and internally rotates glenohumeral joint; clavicular head flexes.
-
Latissimus Dorsi:
- Originates from spinous processes T6-ilium.
- Inserts into the crest of the lesser tubercle (proximal to teres major).
- Externally rotates, extends, and adducts glenohumeral joint (also scapular depression).
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Description
Explore the intricacies of the metacarpal joint ligaments and understand the muscles connecting the trunk to the shoulder girdle. This quiz delves into muscle origins, insertions, and their functions, including complex structures like the serratus anterior and trapezius. Test your knowledge of these anatomical components and their roles in movement.
