Anatomy

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Author:
beanerball16
ID:
106779
Filename:
Anatomy
Updated:
2011-10-06 02:50:19
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Superior Limb Myology
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Description:
Muscles
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  1. Subgroups of the Superior Limb Muscles (6)
    • Muscles of the shoulder and scapula (7)
    • Anterior muscles of the brachium (3)
    • Posterior muscles of the brachium (2)
    • Anterior muscles of the antebrachium (9)
  2. Supraspinatus muscle
    • *Rotator Cuff*
    • Origin: supraspinous fossa of the scapula
    • Insertion: greater tubercle of the humerus
    • Action: abduct limb at shoulder joint
  3. Infraspinatus muscle
    • *Rotator Cuff*
    • Origin: infraspinous fossa of the scapula
    • Insertion: greater tubercle of the humerus
    • Action: extend shoulder joint, rotate brachium laterally (externally)
  4. Teres minor muscle
    • *Rotator Cuff*
    • Origin: Lateral border of the scapula
    • Insertion: greater tubercle of the humerus
    • Action: adduct limb at shoulder joint, rotate brachium laterally (externally)
  5. Teres major muscle
    • Origin: inferior angle of the scapula
    • Insertion: medial border of the intertubercular groove (crest of the lesser tubercle) of the humerus
    • Action: extend shoulder joint, adduct limb at shoulder joint, rotate brachium medially (internally)
  6. Subscapularis muscle
    • *Rotator cuff*
    • Origin: Subscapular fossa
    • Insertion: Lesser tubercle of the humerus
    • Action: Rotate brachium medially (internally)
    • Can only be seen in the when the limb is removed or on a model
  7. Deltoideus muscle
    • Origin: acromial extremity of the clavical, acromion and spine of the scapula
    • Insetion: deltoid tuberosity of the humerus
    • Action: flex and extend shoulder joint, rotate brachium both medially and laterally, abduct limb at shoulder joint
  8. Coracobrachialis muscle
    • Origin: coracoid process of the scapula
    • Insertion: medial aspect of the body of the humerus
    • Action: flex the shoulder joint, adduct limb at shoulder joint
  9. Biceps brachii muscle
    • Long head of the biceps brachii (lateral to the short head)
    • Origin:neck of the scapula (medial to the long head)
    • Short head of the biceps brachii
    • Origin: coracoid process of the scapula

    • Insertion: tuberosity of the radius
    • Action: flex elbow joint, shoulder joint and supinate antebrachium

    Bicipital aponeurosis: diverges medially from the main tendon and blends into the deep antebrachial fasia
  10. Brachialis muscle
    • Origin: anterior aspect of the body of the humerus
    • Insertion: coronoid process of the ulna
    • Action: flex elbow joint
  11. Brachioradialis muscle
    • Origin: lateral supracondylar crest of humerus
    • Insertion: base of styloid process of the ulna
    • Action: flex elbow joint, supinate antibrachium (from pronated position), and pronate antebrachium (from supinated position)
  12. Triceps brachii muscle
    • Long head of the triceps brachii muscle
    • --acts in both the shoulder and cubital joint
    • Action: extend shoulder joint (long head), adduct limb at shoulder joint (long head)
    • Origin: lateral border of the scapula
    • Medial head of the triceps brachii muscle
    • --acts only in the cubital joint
    • Origin: posterior aspects of the humerus
    • Action: extend elbow jointLateral head of the triceps brachii muscle
    • --acts only in the cubital joint
    • Origin: lateral and posterior aspects of the humerus
    • Action: extend elbow joint

    • Insertion: Olecranon of the ulna (all 3 heads by a common tendon).
  13. Anconeus muscle
    • Origin: lateral epicondyle of the humerus
    • Insertion: olecranon (and adjacent body of the ulna)
    • Action: extend cubital joint
  14. Carpal flexor retinaculum
    the overlying, transverely oriented "band" that helps hold the tendons together at the carpal canal
  15. Flexor carpi radialis muscle
    • Origin: medial epicondyle of humerus
    • Insertion: anterior aspect of bases of second and third metacarpal bones
    • Action: flex carpal joint, abduct manus at carpal joint

    best developed of the carpal flexor muscles and lies near the axis (middle) of the anterior aspect of the antebrachium
  16. Palmaris longus muscle
    • Origin: medial epicondyle of the humerus
    • Insertion: carpal flexor retinaculum, carpal ligament, and palmar aponeurosis
    • Action: flex carpal joint
  17. just medial to the flexor carpi radialis muscle
  18. Superficial digital flexor muscle
    • Origin: medial epicondyle of the humerus, coronoid process of the ulna, and proximal aspect of the radius
    • Insertion: middle phalanges of digits 2, 3, 4, and 5
    • Action: flex carpal joint, metacarpophalangieal joints, and proximal interphalangieal joints

    lies deep and medial to the palmaris longus muscle
  19. Deep digital flexor muscle
    • Origin: proximal aspect of ulna
    • Insertion: base of the distal phalangies of digits 2, 3, 4, and 5
    • Action: flex carpal joint and digital joints

    deep and superficial digital flexor muscle and the anterior antebrachial muscles. It passes through "split" those of the superficial digital flexor muscle on the anterior aspect of the bodies of proximal phalanges 2-5
  20. Flexor pollicis longus muscle
    • Origin: anterior aspect of radial body
    • Insertion: distal phalanx of pollex
    • Action: flex digital joints of pollex

    it acts like the "deep digital flexor" in the other digits. The belly lies lateral to the deep digital flexor muscle on the anterior aspect of the antibrachium
  21. Flexor carpi ulnaris muscle
    • Origin: humeral head, medial epicondyle of the humerus, ulnar head, olecranon and body of the ulna
    • Insertion: pisiform bone, hamulus of the hamate bone, base of the 5th metacarpal bone
    • Action: flex carpal joint, adduct manus at the carpal joint

    • most medial of the anterior antebrachial muscles.
    • 2 heads- 1 attaches to the ulnar head and the other to the humeral head
    • the body of the ulna can be used to seporate the flexor carpi ulnaris muscle from the more laterally and posteriorly located extensor carpi ulnaris muscle
  22. Pronator teres muscle
    • Origin: medial epicondyle of humerus and medial side of coronoid proces of the ulna
    • Insertion: lateral side of the middle aspect of the body of radius
    • Action: pronate the manus

    • the "round" (in transverse section) pronator muscle
    • it slants across the proximal half of the anterior aspect of the antebrachium from medial (at the elbow) to lateral
  23. Pronator quadatus muscle
    • Origin: distal, anterior aspect of the body of ulna
    • Insertion: distal, anterior aspect of body of radius
    • Action: pronate the manus

    • the "four-sided" pronator muscle
    • located near the distal end of the antebrachium deep to the other anterior antebrachial muscles
  24. Supinator muscle
    • Origin: lateral epicondyle of the humerus
    • Insertion: body of the radius
    • Action: supinate the manus

    small rotator muscle located on the anterolateral aspect of the cubital region

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