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OAI's of Muscle Lab #1
Origins, Actions, Insertions
40
Anatomy
Undergraduate 1
10/13/2016

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Term
Pectoralis Major
Definition
Origin: sternal end of clavicle, sternum, 1-6 cartilage rib Insertion: greater tubercle/lateral lip of bicipital groove Action: flexes, adducts, and medially rotates humerus
Term
Pectoralis Minor
Definition
Origin: Ribs 3-5
Insertion: Coracoid process of scapular
Action: protracts, rotates scapula downward
Term
Serratus Anterior
Definition
Origin: ribs 1-8
Insertion: Medial border of scapula
Action: rotates scapula upward
Term
Subscapularis
Definition
Origin: subscapular fossa of scapula
Insertion: lesser tubercle of humerus
Actions: Chief medial rotator of humerus, adduction of humerus
Term
Coracobrachialis
Definition
Origin: coracoid process of scapula
Insertion: Medial surface of humerus shaft
Action: flexion and adduction of humerus,
Term
Biceps Brachii
Definition
Insertion: Radial tuberosity
Action: flexion of elbow
Term
Long Head of Biceps Brachii
Definition
Origin: supraglenoid tubercle
Action: Supination of forearm
Term
Short Head of Biceps Brachii
Definition
Origin: Coracoid process
Term
Brachialis
Definition
Origin: Lower humerus
Insertion: Ulna tuberosity
Action: flexion of elbow
Term
Prontator teres
Definition
Origin: Medial epicondyle of humerus by common flexor tendon (CFT)
Insertion: lateral shaft of radius
Action: Pronation of forearm, flexion of elbow
Term
Flexor carpi radialis
Definition
Origin: medial epicondyle of humerus by CFT
Insertion: bases of 2nd and 3rd metacarpals
Action: flexion, abduction of wrist
Term
Palmaris longus
Definition
Origin: medial epicondyle of humerus by CFT
Insertion: palmar aponeurosis, flexor retinaculum
Action: flexion of wrist
Term
Flexor carpi ulnaris
Definition
Origin: medial epicondyle of humerus by CFT
Insertion: Pisiform, hamate, base of 5th metacarpal
Action: flexion, adduction of wrist
Term
Flexor digitorum superficialis
Definition
Origin: medial epicondyle of humerus
Insertion: Middle phalanges of digits 2-5
Action: Flexion of middle phalanges of fingers & wrist
Term
Flexor digitorum profundus
Definition
Insertion: Distal phalanges of digits 2-5
Action: Flexion of distal phalanges of fingers & wrist
Term
Flexor pollicis longus
Definition
Action: flexion of thumb
Term
Pronator quadratus
Definition
Action: pronates forearm
Term
Brachioradialis
Definition
Origin: Lateral supracondylar ridge of humerus
Insertion: styloid process of radius
Action: flexion of elbow
Term
Extensor carpi radialis longus
Definition
Origin: lateral supracondylar ridge of humerus
Insertion: base of 2nd metacarpal
Action: Extension & abduction of wrist
Term
Extensor carpi radialis brevis
Definition
Origin: Lateral epicondyle of humerus of common extensor tendon
Insertion: Base of 3rd metacarpal
Action: extension of wrist
Term
Extensor digitorum
Definition
Origin: lateral epicondyle of humerus of common extensor tendon
Insertion: eextensor expansion of digits 2-5
Action: extension of proximal phalanges 1-4 & wrist
Term
Extensor digiti minimi
Definition
Origin: lateral epicondyle of humerus of common extensor tendon
Insertion: extensor expansion of little finger
Action: extension of proximal of little finger & wrist
Term
Extensor carpi ulnaris
Definition
Origin: lateral epicondyle of humerus of common extensor tendon
Insertion: base of 5th metacarpal
Action: extension & adduction of wrist
Term
Abductor pollicis longus
Definition
Insertion: base of 1st metacarpal
Action: abduction of 1st metacarpal of thumb & wrist
Term
Extensor pollicis brevis
Definition
Insertion: base of proximal phalanx of thumb
Action: extension of proximal phalanx of thumb & wrist abduction
Term
Extensor pollicis longus
Definition
Insertion: base of distal phalanx of thumb
Action: extension of distal phalanx of thumb & wrist abduction
Term
Extensor indicis
Definition
Insertion: extensor expansion of index finger
Action: extension of proximal phalanx of index finger & wrist
Term
Trapezius
Definition
Origin: external occipital protuberance, C7-C12 spinous processes
Insertion: lateral clavicle acromion, spine of scapula
Action: elevation, upward rotation of scapula, retraction of scapula, depression
Term
Latissimus dorsi
Definition
Origin: lower 6 thoracic spinous processes, sacrum & iliac crest, lower 3-4 ribs, inferior angle of scapula
Insertion: bicipital (intertubercular) groove of humerus
Action: extension, medial rotation & adduction of humerus
Term
Teres major
Definition
Origin: inferior angle of scapula
Insertion: crest of lesser tubercle of humerus, medial lip of bicipital groove
Action: extension, medial rotation & adduction of humerus
Term
Deltoid
Definition
Origin: (lateral) clavicle, acromion, spine of scapula
Insertion: deltoid tuberosity of humerus
Action: flexion/extension, abduction, medial/lateral rotation of humerus
Term
Rhomboid minor
Definition
Term
Rhomboid major
Definition
Insertion: medial border of scapula
Term
Levator scapulae
Definition
Action: elevation & downward rotation of scapula
Term
Supraspinatus
Definition
Origin: Supraspinous fossa of scapula
Insertion: greater tubercle of humerus
Action: abduction of humerus, stabilization of humerus
Term
Infraspintus
Definition
Origin: infraspinous fossa of scapula
Insertion: greater tubercle of humerus
Action: lateral rotation & extension of humerus
Term
Teres minor
Definition
Origin: upper 2/3 of scapula
Insertion: greater tubercle of humerus
Action: lateral rotation, extension of humerus
Term
Long head of Triceps
Definition
Origin: infraglenoid tubercle of scapula
Insertion: olecranon process of ulna
Action: extension of elbow & humerus
Term
Lateral head of Triceps
Definition
Origin: posterior humerus
Term
Medial head of Triceps
Definition
Origin: posterior humerus
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