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Muscular System: Arm (Brachium) OIA
BI 301L: Anatomy and Physiology (Portland State University)
27
Anatomy
Undergraduate 3
10/21/2011

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Cards

Term
Pectoralis major origin
Definition

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Origin: medial half of clavicle, lateral margin of sternum, costal cartilidges 1-7, aponeurosis of external oblique

Term
Pectoralis major insertion
Definition

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Insertion: lateral lip of intertuberal groove of humerus

Term
Pectoralis major action
Definition

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Action: flexes, adducts, and medially rotates humerus "hugging muscle"

Term
Latissimus dorsi origin
Definition

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Origin: vertebrae T7-L5, lower 3-4 ribs, iliac crest, thoracolumbar fascia

Term
Latissimus dorsi insertion
Definition

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Insertion: floor of intertuberlar groove of the humerus

Term
Latissimus dorsi action
Definition

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Action: extends, adducts, and medially rotates humerus "handcuff muscle"

Term
Deltoid origin
Definition

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Origin: acromion and spine of scapula, clavicle

Term
Deltoid insertion
Definition

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Insertion: deltoid tuberosity of humerus

Term
Deltoid action
Definition

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Action: flex and medially rotate humerus, abduct humerus, extend and laterally rotate humerus

Term
Supraspinatus origin
Definition

Origin: Supraspinous fossa of scapula

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Term
Supraspinatus insertion
Definition

Insertion: greater tubercle of humerus

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Term
Supraspinatus action
Definition

Action: abduction of humerus

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Term
Infraspinatus origin
Definition

Origin: infraspinous fossa of scapula

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Term
Infraspinatus insertion
Definition

Insertion: greater tubercle of humerus

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Term
Infraspinatus action
Definition

Action: rotates humerus laterally

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Term
Teres major origin
Definition

Origin: inferior angle of scapula

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Term
Teres major insertion
Definition

Insertion: medial lip of intertubercular groove of humerus

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Term
Teres major action
Definition

Action: extends and medially rotates humerus

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Term
Teres minor origin
Definition

Origin: lateral border and adjacent posterior surface of scapula

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Term
Teres minor insertion
Definition

Insertion: greater tubercle of humerus

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Term
Teres minor action
Definition

Action: rotates humerus laterally

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Term
Subscapularis origin
Definition

Origin: subscapular fossa of scapula

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Term
Subscapularis insertion
Definition

Insertion: lesser tubercle of humerus

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Term
Subscapularis action
Definition

Action: rotates humerus medially

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Term
Coracobrachialis origin
Definition

Origin: coracoid process of the scapula

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Term
Coracobrachialis insertion
Definition

Insertion: medial aspect of humeral shaft

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Term
Coracobrachialis action
Definition

Action: flexes and medially rotates humerus

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