Muscles of the Thorax and Abdomen: Muscles of the Thoracic Wall Flashcards

1
Q

Pectoralis Major Proximal Attachment

A

Clavicular head: Medial end of the clavicle

Sternocostal head: Anterior sternum and costal cartilages of the first 6 ribs

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2
Q

Pectoralis Major Distal Attachment

A

Lateral lip of the intertubercular groove of the humerus

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3
Q

Pectoralis Major Innervation

A

Medial and lateral pectoral nerves [C5,C6,C7,*C8,T1]

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4
Q

Pectoralis Major Action

A
All fibers:
Medially rotate the shoulder
Adduct the shoulder
Clavicular head:
-Flexes the shoulder
-Horizontally adducts the shoulder
Sternocostal head:
-Extends the shoulder
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5
Q

Pectoralis Minor Proximal Attachment

A

Ribs 3-5

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6
Q

Pectoralis Minor Distal Attachment

A

Coracoid process of the scapula

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7
Q

Pectoralis Minor Innervation

A

Medial pectoral [C8,T1]

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8
Q

Pectoralis Minor Action

A

Tilts the scapula anteriorly
Depresses the shoulder girdle
Assists with:
-Elevation of ribs during forced inhalation

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9
Q

Subclavius Proximal Attachment

A

Junction of the 1st rib and 1st costal cartilage

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10
Q

Subclavius Distal Attachment

A

Inferior surface of the middle of the clavicle

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11
Q

Subclavius Innervation

A

Nerve to subclavius [*C5,C6]

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12
Q

Subclavius Action

A

Depresses the clavicle

Stabilizes the sternoclavicular joint

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13
Q

External Intercostal Proximal Attachment

A

Inferior border of the ribs above

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14
Q

External Intercostal Distal Attachment

A

Superior border of the ribs below

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15
Q

External Intercostal Innervation

A

Intercostal nerves T1-T11

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16
Q

External Intercostal Action

A

Elevates ribs to assist with inhalation

17
Q

Internal Intercostal Proximal Attachment

A

Inferior border of the ribs above

18
Q

Internal Intercostal Distal Attachment

A

Superior border of the ribs below

19
Q

Internal Intercostal Innervation

A

Intercostal nerves T1-T11

20
Q

Internal Intercostal Action

A

Depresses ribs to assist with exhalation

21
Q

Innermost Intercostal Proximal Attachment

A

Inferior border of the ribs above

22
Q

Innermost Intercostal Distal Attachment

A

Superior border of the ribs below

23
Q

Innermost Intercostal Innervation

A

Intercostal nerves T1-T11

24
Q

Innermost Intercostal Action

A

Probably depresses ribs to assist with exhalation

25
Q

Transversus Thoracis Proximal Attachment

A

Inner surface of the sternum

26
Q

Transversus Thoracis Distal Attachment

A

Inner surfaces of costal cartilages 2-6

27
Q

Transversus Thoracis Innervation

A

Intercostal nerves 2-6

28
Q

Transversus Thoracis Action

A

Depresses ribs to assist with exhalation

29
Q

Diaphragm Proximal Attachment

A

Xiphoid process, costal margins, fascia over the quadratus lumborum and psoas major mm., and vertebral bodies L1-L3

30
Q

Diaphragm Distal Attachment

A

Central tendon of the diaphragm

31
Q

Diaphragm Innervation

A

Phrenic nerve (C3-C5)

32
Q

Diaphragm Action

A

Draws the central tendon downward during inspiration