Pectoral Region Flashcards

1
Q

What nerve innervates the pectoralis major muscle?

A

Lateral and medial pectoral nerves (c5, C6)

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2
Q

What is the action of the pectoralis major muscle?

A

Adducts and medially rotates humerus, draws scapular anteriorly and inferiorly

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3
Q

What is the blood supply to the pectoralis major?

A

Pectoral and deltoid branch of the thoracoacromial artery

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4
Q

What is the nerve supply of the pectoralis minor?

A

Medial pectoral nerve (C8, T1)

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5
Q

What is the action of the pectoralis minor?

A

Draws scapula inferiorly and anteriorly against thoracic wall

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6
Q

What is the blood supply to the pectoralis minor?

A

Pectoral and deltoid branches of the thoracoacromial artery

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7
Q

What is the nerve supply to the subclavius?

A

Nerve to subclavius (c5, c6)

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8
Q

What is the action of the subclavius?

A

Anchors and depresses the clavicle

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9
Q

What is the blood supply to the subclavius?

A

Clavicular branch of the thoracoacromial artery

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10
Q

What is the nerve supply of the serratus anterior?

A

Long thoracic nerve (c5, C6, C7)

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11
Q

What is the action of the serratus anterior?

A

Protracts scapula, rotates scapula (allows abduction of glenohumeral past 90 degrees)

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12
Q

If there is damage to the long thoracic nerve what happens and why?

A

‘Winged scapula’ upon full extension (arms out in front of you)

Because the serratus anterior muscle is paralysed and cannot rotate scapula

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