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Muscles 4th Quiz Liz
Liz's 4th Muscle Quiz (O,I,A)
| Question | Answer |
|---|---|
| Concentric Contraction | muscle SHORTENS during contraction (insertion moves toward origin) |
| Stretch | Perform actions that are opposite the muscle's action. |
| Isometric Contraction ('same length') | The muscle that is STRONGER in a given action at a given joint Active Muscle (strongest muscles) |
| Slack | Passively do the muscle action.(You do it for them) |
| Extensors | Muscles that cross a joint posteriorly (except knee, which crosses the joint anteriorly) |
| Eccentric Contraction | muscle LENGTHENS during concentration (origin & insertion move further apart) |
| Antagonist | Muscle capable of performing the OPPOSITE action to that of the agonist (& its synergists)Passive Muscle |
| Flexors | Muscles that cross the long axis of a joint anteriorly (except knee, which crosses the joint posteriorly) will most likely flex that joint. |
| Synergist | A muscle that ASSIST the agonist in a given action at a giving joint; Usually weaker than the agonist Active Muscle |
| Abductors | muscles that cross a joint laterally |
| Agonist or Prime Movers | The muscle that is STRONGER in a given action at a given joint Active Muscle (strongest muscles) |
| Adductors | muscles that cross a joint medially |
| Fixator | These muscles STABILIZE the joint during movement. |
| Rotators | muscles that cross a joint obliquely |
| Coracobrachialis Origin | Coracoid process of scapula |
| Coracobrachialis Insertion | mid-medial shaft of humerus |
| Coracobrachialis Action | SYN: flexion, adduction |
| Latissimus Dorsi Origin | T-6 spinous processes to sacrum via the thoracolumbar aponeurosis, Iliac crest and ribs 9-12 |
| Latissimus Dorsi Insertion | mid lip of the bicipital groove of humerus |
| Latissimus Dorsi Action | PM; extention, hyperextension Syn; medial rotation, adduction depress ribs during exhalation |
| Pectoralis Major Origin | Clavical Fibers: anterior, medial clavicleSternal Fibers: sternum, costal cartilage |
| Pectoralis Major Insertion | lateral lip of the bicipital groove of the humerus |
| Pectoralis Major Action | PM: adduction Syn: medial rotation, horizontal adduction, elevates ribs during inhalation Syn; flexion (clavicle fibers)Syn; extention (sternal fibers) |
| Teres Major Origin | lower third of the lateral border of the scapula |
| Teres Major Insertion | medial to the medial lip of the bicipital groove of humerus |
| Teres Major Action | Syn; extension, hyperextension, medial rotation, adduction |
| Deltoid Origin | Anterior Fibers; anterior, lateral clavicle Middle Fibers; acromion Posterior Fibers; spine of scapula (inferior surface) |
| Deltoid Insertion | deltoid tuberocity of humerus |
| Deltoid Action | All Fibers: PM; adducion (middle strongest)Ant Fibers: PM; flexion SYN: medial rotation, horizontal adduction Posterior Fibers; extension, hyperextension, lateral rotation, horizonal abduction |
| Teres Minor Origin | upper two thirds of lateral border of scapula |
| Teres Minor Insertion | Posterior greater tubercle; inferior facet/inferior to infrapinatus |
| Teres Minor Action | Syn; lateral rotation; FIXATOR OF SHOULDER JT |
| Infraspinator Origin | infraspinous fossa of scapula |
| Infraspinator Insertion | posterior greater tubercle- middle facet, inferior to supraspinatus |
| Infraspinator Action | Syn; lateral rotation; FIXATOR OF SHOULDER JT |
| Pronator Origin | medial epicondyle of humerus |
| Pronator Insertion | mid- lateral of radial shaft |
| Pronator Action | Syn; flexion, pronation |
| Supraspinatus Origin | supraspinaous fossa to scapula |
| Supraspinatus Insertion | superior facet of greater tubercle (top of humerus) |
| Supraspinatus Action | Syn; abduction, (1st 15 degrees strong)FIXATOR OF SHOULDER JT |
| Anconeous Origin | lateral epicondyle of radius |
| Anconeous Insertion | proximal, posterior ulna shaft |
| Anconeous Action | Syn; extension |
| Brachioradialis Origin | distal half of humerus (2/3") above elbow joint |
| Brachioradialis Insertion | lower lateral end of radius, just above styloid process of radius |
| Brachioradialis Action | PM:flexion exp in neutral position Syn; pronation & supination (brings forearm into neutral position) |
| Subcapularis Origin | subscapular fossa of fossa |
| Subcapularis Insertion | lessar tubercle of humerus |
| Subcapularis Action | medial rotation; FIXATOR OF SHOULDER |
| Pronator Quadratus Origin | distal, anterior ulna |
| Pronator Quadratus Insertion | distal, anterior radius |
| Pronator Quadratus Action | PM; pronation |
| Biceps Brachii Origin | Long Head; supraglenoid tubercle (runs thru shoulder jt bicipital groove)Short head; coracoid process of scapula |
| Biceps Brachii Insertion | bicipital tuberocity of radius |
| Biceps Brachii Action | Shoulder Jt: All SYN- flexion Long Head: SYN- abduction Short Head SYN- adduction Forearm: PM- Supination Elbow: PM- flexion (strong in supination position) |
| Supinator Origin | proximal, posterior ulnar shaft |
| Supinator Insertion | proximal, anterior radius; lateral epicondyle of humerus |
| Supinator Action | PM: supination |
| Brachialis Origin | distal half of anterior humerus |
| Brachialis Insertion | ulnar tuberocity of the ulnar |
| Brachialis Action | PM: flexion (strong in any position) supinated, pronated, neutral |
| Tricep Brachii Origin | Long Head: infragleniod tubercle of the scapula Lateral Head: proximal, posterior humerus Medial Head: distal half of the posterior humerus |
| Tricep Brachii Insertion | (top of) olecranon of the ulna |
| Tricep Brachii Action | Shoulder: SYN; extension, hyperextention, adductionElbow: PM- extension |
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