Pectoral Region and Axilla Muscles Flashcards by Katie Lohrman | Brainscape

Q

Pectoralis Major Clavicular Head

Origin

A

-anterior surface of medial half of clavicle

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Q

Pectoralis Major

Insertion

A

-Lateral lip of intertubercular groove of humerus

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Q

Pectoralis Major

Innervation

A

Lateral and medial pectoral nerves
clavicular head (C5, C6)
sternocostal head (C7, C8, T1)

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Q

Pectoralis Major

Action

A

–Horizontally adducts and medially rotates humerus.

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Q

Pectoralis Major Sternocostal Head

Origin

A

anterior surface of sternum

- superior 6 costal cartilages

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Q

Pectoralis Major Clavicular Fibers

Action

A

-horizontally adduct humerus.

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Q

Pectoralis Major Sternocostal Fibers

Action

A

-horizontally adduct & extend humerus from a

flexed position.

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Q

Pectoralis Minor

Origin

A

-3rd to 5th ribs near their costal cartilages

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Q

Pectoralis Minor

Insertion

A

-Medial border and superior surface of coracoid process of scapula

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Q

Pectoralis Minor

Innervation

A

-Medial pectoral nerve (C8, T1)

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Q

Pectoralis Minor

Action

A

Anteriorly tilts & depresses scapula.

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Q

Subclavius

Origin

A

-Junction of 1st rib and its costal cartilage

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Q

Subclavius

Insertion

A

-Inferior surface of middle third of clavicle

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Q

Subclavius

Innervation

A

-Nerve to subclavius (C5, C6)

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Q

Subclavius

Action

A

-Stabilizes and depresses clavicle.

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Q

Serratus Anterior

Origin

A

-External and lateral surface of 1st – 8th ribs

Q

Serratus Anterior

Insertion

A

-Anterior surface of medial border of scapula

Q

Serratus Anterior

Innervation

A

-Long thoracic nerve (C5, C6, C7)

Q

Serratus Anterior

Action

A

Upwardly rotates & abducts scapula.

- Stabilizes scapula on thoracic wall.

Q

Coracobrachialis

Origin

A

-Coracoid process of scapula

Q

Coracobrachialis

Insertion

A

-Middle third of medial surface of humerus

Q

Coracobrachialis

Innervation

A

-Musculocutaneous nerve (C5, C6, C7)

Q

Coracobrachialis

Action

A

Flexes & adducts humerus.

- Resists dislocation of glenohumeral joint.