Muscles Flashcards
Anterior deltoid
Action: shoulder flexion, IR
Origin: anterior lateral clavicle
Insertion: deltoid tuberosity of humerus
Nerve: axillary, C5/6
Middle deltoid
Action: abduction
Origin: acromion, spine of scapula
Insertion: deltoid tuberosity
Nerve: axillary, C5/6
Posterior deltoid
Action: extension, ER
Origin: spine of scapula
Insertion: deltoid tuberosity
Nerve: axillary, C5/6
Pectoralis major
Action: adducts, IR
Claviclar head: flexes arm
Sternal head: extends arm
Origin: clavicular- middle clavicle
Sternal- sternum
Insertion: bicipital groove of humerus
Nerve: clavicular- lateral pectoral, C5,6,7
Sternal- medial pectoral C8,T1Biceps
Action: weak shoulder flexor, flexes forearm, supinates
Origin: short head- coracoid process
Long head- Supraglenoid tubercle of scapula
Insertion: radial groove
Nerve: musculocutaneous, C5,6,7
Coracobrachialis
Action: flexes shoulder, adducts
Origin: coracoid process
Insertion: middle medial humerus
Nerve: musculocutaneous, C5,6,7
Subscapularis
Action: IR
Origin: subscapular fossa
Insertion: lesser tubercle of humerus
Nerve: subscapularis, C5,6,7
Teres major
Action: adducts, extends, IR
Origin: inferior angle of Scapula
Insertion: bicipital groove
Nerve: subscapularis, C5,6,7
Lattisimus Dorsi
Action: extends, IR, adducts
Origin: spinous processes T7-L5, inferior angle of Scapula, lower ribs
Insertion: bicipital groove
Nerve: thoracodorsal, C6,7,8
Supraspinatus
Action: Abduction
Origin: supraspinous fossa
Insertion: greater tubercle
Nerve: suprascapular C5,6
Infraspinatus
Action: ER
Origin: infraspinous fossa
Insertion: greater tubercle
Nerve: suprascapular C5,6
Teres minor
Action: ER, addiction
Origin: lateral border of scapula
Insertion: greater tubercle
Nerve: axillary C5,6
Triceps
Action: extends
Origin: long head- infraglenoid tubercle of scapula
Medial- inferior posterior humerus
Lateral- proximal posterior humerus
Insertion: long head- olecranon process
Medial- olecranon process
Lateral- olecranon process
Nerve: radial C7,8
Serratus anterior
Action: protraction, upward rotation
Origin: anterior surface of ribs 1-9
Insertion: anterior surface of medial border of scapula
Nerve: long thoracic C5-7
Pectoralis minor
Action: downward rotation, protraction
Origin: anterior ribs 3-5 (sternal end)
Insertion: coracoid process
Nerve: medial pectoral nerve C8-T1
Levator scapulae
Action: elevates scapula
Origin: transverse process of C1-4
Insertion: superior angle of scapula
Nerve: dorsal scapular nerve C5
Trapezius
Action: shoulder elevation, upward and downward rotation, retraction
Origin: Nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes of C7-T12
Insertion: lateral clavicle, acromion, spine of scapula
Nerve: spinal accessory nerve, C3,4
Rhomboids
Action: retracts
Origin: spinous processes of T2-T5
Insertion: medial border of scapula
Nerve: dorsal scapular C5
Brachialis
Action: flexes forearm
Origin: distal half of humerus
Insertion: coranoid process and ulnar tuberosity
Nerve: musculocutaneous C5,6
Brachioradialis
Action: flexes
Origin: lateral Supracondylar ridge of humerus
Insertion: radial styloid process
Nerve: radial C5,6
Pronator teres
Action: pronates and flexes
Origin: medial epicondyle of humerus
Insertion: middle lateral radius
Nerve: median C6,7
Anconeous
Action: extends
Origin: lateral epicondyle
Insertion: posterior olecranon
Nerve: radial C7,8
Flexor Carpi radialis
Action: flexes, RD
Origin: medial epicondyle
Insertion: bases of 2nd and 3rd metacarpals
Nerve: median C6,7
Palmaris longus
Action: flexes hand and wrist
Origin: medial epicondyle
Insertion: flexor retinaculum, palmar aponeurosis
Nerve: median C7,8
