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Gross Anatomy 2 > Pectoral Region > Flashcards

Pectoral Region Flashcards

1
Q

What is the origin of pec major?

A

Clavicular head: medial 1/3 of clavicle
Sternal head: from costal margin of sternum and 2nd to 6th costal cartilages

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2
Q

What is insertion of pec major?

A

Lateral lip of intertubercular sulcus (bicipital groove)

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3
Q

What innervates pec major?

A

Medial and lateral pectoral nerves

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4
Q

Spinal level of pec major?

A

C6/7/8

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5
Q

Action of pec major?

A

Adduction. Think bowling, flex an extended arm and extend a flexed arm. Medial rotation.

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6
Q

Origin and insertion of pec minor?

A

Origin: Ribs 2-5
Insertion: Coracoid process of scapula

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7
Q

What innervates pec minor?

A

Medial and lateral pectoral nerves.

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8
Q

Spinal level of pec minor?

A

C7

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9
Q

Action of pec minor?

A

Protract scapula and elevate ribs. Aids in breathing when we put our hands on top of our head such as after running.

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10
Q

Origin and insertion of subclavius?

A

Origin: superior surface of first rib near costocartilage junction
Insertion: middle 1/3 of clavicle

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11
Q

What innervates subclavius?

A

Nerve to subclavius.

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12
Q

Spinal levels of subclavius?

A

C5/6

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13
Q

Action of subclavius?

A

Depress clavicle.

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14
Q

Origin and insertion of serratus anterior?

A

Origin: upper 9 ribs
Insertion: ventral aspect of medial border of scap

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15
Q

What innervates serratus anterior?

A

Long thoracic nerve

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16
Q

What is spinal level of serratus anterior?

A

C6

17
Q

What action does serratus anterior perform?

A

Protracts the scapula.
Upward rotation of glenoid fossa.

18
Q

What commonly gets injured due to winging of the scapula?

A

Long thoracic nerve.

19
Q

Main lymph drainage sites in pectoral region?

A

Central Axillary lymph nodes.
Parasternal lymph nodes.

20
Q

What separates deltoid and pectoralis major muscles?

A

Cephalic vein.

21
Q

Supraclavicular nerve dermatomes?

A

C3/4

22
Q

Upper lateral brachial cutaneous nerve dermatome?

A

C5

23
Q

Intercostobrachial nerve dermatome?

A

T2

24
Q

Medial branch cutaneous nerve dermatomes?

A

T1

25
Q

Lower lateral brachial cutaneous nerve dermatome?

A

C5/6

26
Q

Posterior antebrachial cuteanous nerve dermatome?

A

C6/7

Gross Anatomy 2 (11 decks)

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