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Trunk Muscles > Chest Muscles > Flashcards

Chest Muscles Flashcards

1
Q

Pectoralis Major

A

Origin:
Clavicular head: medial half of clavicle. Sternocostal head: anterior surface of sternum, Superior six costal cartilages, and aponeurosis of external oblique muscle

Insertion:
Lateral lip of intertubercular sulcus of humerus

Function:
Flexes, adducts & medially rotates humerus

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2
Q

Pectoralis Minor

A

Origin:
3rd to 5th ribs near their costal cartilages

Insertion:
Coracoid process of scapula

Function:
Draws scapula forward & downward

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3
Q

Serratus Anterior

A

Origin:
Lateral surface of ribs 1-8 (or 9)

Insertion:
Anterior surface of medial border of the scapula

Function:
Protracts & stabilizes scapula, Assists in upward rotation

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4
Q

Subclavius

A

Origin:
Junction of 1st rib & Costal cartilage

Insertion:
Groove on the inferior surface of clavicle

Function:
Stabilizes & depresses clavicle

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5
Q

Intercostals (External, Internal, Innermost)

A

Origin:
Inferior border of the rib above

Insertion:
Superior border of the rib below

Function:
External: elevate ribs, expand thoracic cavity for inspiration. Internal & Innermost: depress ribs, diminish thoracic cavity for expiration

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6
Q

Origin:
Clavicular head: medial half of clavicle. Sternocostal head: anterior surface of sternum, Superior six costal cartilages, and aponeurosis of external oblique muscle

Insertion:
Lateral lip of intertubercular sulcus of humerus

Function:
Flexes, adducts & medially rotates humerus

A

Pectoralis Major

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7
Q

Origin:
3rd to 5th ribs near their costal cartilages

Insertion:
Coracoid process of scapula

Function:
Draws scapula forward & downward

A

Pectoralis Minor

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8
Q

Origin:
Lateral surface of ribs 1-8 (or 9)

Insertion:
Anterior surface of medial border of the scapula

Function:
Protracts & stabilizes scapula, Assists in upward rotation

A

Serratus Anterior

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9
Q

Origin:
Junction of 1st rib & Costal cartilage

Insertion:
Groove on the inferior surface of clavicle

Function:
Stabilizes & depresses clavicle

A

Subclavius

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10
Q

Origin:
Inferior border of the rib above

Insertion:
Superior border of the rib below

Function:
External: elevate ribs, expand thoracic cavity for inspiration. Internal & Innermost: depress ribs, diminish thoracic cavity for expiration

A

Intercostals (External, Internal, Innermost)

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Trunk Muscles (3 decks)

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