ÅR.2 Muskler Flashcards
(20 cards)
Deltoid
Origin
ANTERIOR: Lateral third of clavicle
MIDDLE: Acromion
POSTERIOR: spine of scapula
Insertion
Deltoid tubercle on the humerus
Nerve:
Axillary C5,6
Action:
ALL: Vertical abduction
ANTERIOR: medial rotation, flexion
POSTERIOR: lateral rotation, extension
Supraspinatus
Origin:
Medial 2/3 of supraspinous fossa
Insertion:
Superior facet of greater tubercle of humerus + shpulder joint capsule
Nerve:
Suprascapular C5,6
Action:
Stabilize humeral head. Abduction
Infraspinatus
Origin:
Medial 2/3 of infraspinous fossa
Insertion:
Middle facet of greater tubercle of humerus + shoulder joint capsule
Nerve:
Suprascapular C5,6
Action:
Stabilize humeral head. Lateral rotation
Teres minor
Origin:
Upper 2/3 of posterior latteral border of scapula
Insertion:
Inferior facet of greater tubercle of humerus + shoulder joint capsule
Nerve:
Axillary C5,6
Action:
Stabilize humeral head. Lateral rotation, weak avduction of hunerus
Subscapularis
Origin:
Subscapular fossa
Insertion:
Lesser tubercle of humerus
Nerve:
Upper & lower subscapular nerve C5,6
Action:
Stabilize humeral head. Medial rotation
Teres major
Origin:
Oval area, on dorsal surface, of inferior scapular angle
Insertion:
Medial lip of bicipital groove
Nerve:
Lower subscapular nerve C5,6,7
Action:
Extension and medial rotation of humerus
Triceps brachii
Origin:
LONG head: infraglenoid tubercle of scapula
LATTERAL head: posterior upper humerus, superior to radial groove
MEDIAL head: posterior upper humerus, inferior to radial groove
Insertion:
Olecranon process
Nerve:
Radial C6, 7, 8
Action:
Extension of shoulder and elbow
Biceps brachii
Origin:
LONG head: supraglenoid tubercle of scapula
SHORT head: coracoid process
Insertion:
Radial tuberosity
Nerve:
Musculocutaneous C5,6
Action:
Flexion of shoulder and elbow, supination of forearm
Coracobrachialis
Origin:
Coracoid process
Insertion:
Medial border of shaft og humerus
Nerve:
Musculocutaneous C5, 6, 7
Action:
Flexion and horizontal adduction of shoulder
Pectoralis minor
Origin:
Upper margins, outer surfaces of 3-5 ribs (near cartilages)
Insertion:
Coracoid process
Nerve:
Lateral + medial and pectoral nerve C5-T1
Action:
Protraction of scapula + rotate
Pectoralis major
Origin:
CLAVICULAR fibres: medial 1/2 of clavicle
STERNAL fibres: sternum. Upper 6 costal cartilages. Rib 6. External oblique aponeurosis
Insertion:
Lateral lip of bicipital groove
Nerve:
Medial and lateral pectoral nerves C5 - T1
Action:
Adduction + medial rotation of humerus
Middle trapezius
Origin:
T1 - T5 Sp’s
Insertion:
Acromion, spine of scapula
Nerve:
Spinal part of accessory nerve, sensory ventral rami C3, 4
Action:
Retraction of scapula + stabilization
Lower Trapezius
Origin:
T6 - T12 Sp’s
Insertion:
Medial spine of scapula - tubercle at its lateral apex
Nerve:
Spinal part of accessory nerve, sensory from ventral rami C3, 4
Action:
Retraction of scapula + stabillization
Brachioradialis
Origin:
Proximal 2/3 of lateral supracondylar ridge og humerus. lateral intermuscular septum
Insertion:
Lateral distal radius, proximal to styloid process
Nerve:
Radial C5, 6
Action:
Flexion of elbow (perticularly with forearm pronated)
Lattissimus dorsi
Origin:
T7 - S2 Sp’s. Thoracolumbar facia. Iliac crest. Lower 3-4 ribs. Inferior angle of scapula.
Insertion:
Bicipital groove
Nerve:
Thoracodorsal nerve C6, 7, 8
Action:
Adduction, extension, medial rotation of humerus. Aids deep inspiration and forced expiration.
Rhomboids
Origin:
MINOR: C7, T1 Sp’s
MAJOR: T2 - 5 Sp’s
Insertion:
MINOR: medial end of spine of scapula
MAJOR: medial border of scapula, between spine of scapula and inferior angle.
Nerve:
Dorsal scapular C4, 5
Action:
Scapular retraction + stabillization
Serratus anterior
Origin:
Outer surface, fleashy digitations ribs 1-9
Insertion:
Medial border of scapula
Nerve:
Long thoracic C5, 6, 7
Action:
Fixes scapular position against resistance.
Uppward rotation of scapula. Protraction of scapula.
Supinator
Origin:
Lateral epicondyle of humerus. Supinator crest of ulna. Radial collateral ligament
Insertion:
Lateral surface, proximal 1/3 radius
Nerve:
Posterior interosseous nerve C6, 7
(Branch of radial nerve)
Action:
Supination of forearm
Flexor carpi radialis
Origin:
Medial epicondyle
Insertion:
Palmar surface of the base of the 2 metacarpal, sending a slip to the 3
Nerve:
Median nerve C6, 7
Action:
Flexion and radial diviation of wrist
Pronator teres
Origin:
HUMERAL head: proximal ti medial epicondyle.
ULNAR head: medial side of coronoid process of ulna
Insertion:
Lateral surface of radial shaft
Nerve:
Median C6, 7
Action:
Pronation of forearm. Weak flexion of elbow
