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Muscles O,I&A's > Muscles of Thorax > Flashcards

Muscles of Thorax Flashcards

1
Q

Origin of the Diaphragm

A

Xphoid process
Costal Margin
Fascia over quadratus lumborum and psoas major
Vertebral bodies of L1-L3
Lateral & medial arcuate ligaments

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2
Q

Insertion of Diaphragm

A

Central tendon of diaphragm

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3
Q

Action of Diaphragm

A

Pushes abdominal viscera inferiorly increasing the volume of thoracic cavity (inhalation)

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4
Q

Origin of External Intercostals

A

Lower border of a rib within an intercostal space

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5
Q

Insertion of External Intercostals

A

Upper border of rib below, coursing downward and medially

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6
Q

Action of External Intercostals

A

Keeps the intercostal space from blowing out or sucking in during respiration

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7
Q

Origin of Innermost Intercostals

A

Upper border of a rib

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8
Q

Insertion of Innermost Intercostals

A

Fibers course up and medially to insert on the inferior margin of the rib above

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9
Q

Action of Innermost Intercostals

A

Keep the intercostal space from blowing out or sucking in during respiration

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10
Q

Origin of Internal Intercostals

A

Upper border of rib above

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11
Q

Action of Internal Intercostals

A

Keep the intercostal space from blowing out or sucking in during respiration

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12
Q

Insertion of Internal Intercostals

A

Lower border of rib above, coursing up and medially

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13
Q

Origin of Levatores Costarum

A

TVP’s of C7-T11

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14
Q

Insertion of Levatores Costarum

A

Rib below its origin, medial to the angle

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15
Q

Action of Levatores Costarum

A

Elevates rib

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16
Q

Origin of Serratus Posterior Inferior

A

Thoracolumnar fascia, SPs of T11-12

17
Q

Insertion of Serratus Posterior Inferior

A

Ribs 9-12, latearl to the angles

18
Q

Action of Serratus Posterior Inferior

A

Pulls down lower ribs

19
Q

Origin of Serratus Posterior Superior

A

Nuchal ligament, Sp’s pf C7-T3

20
Q

Insertion of Serratus Posterior Superior

A

Ribs 1-4, lateral to the angles

21
Q

Action of Serratus Posterior Superior

A

Elevates the upper ribs

22
Q

Origin of Subcostalis

A

Angles of ribs

23
Q

Insertion of Subcostalis

A

Angle of a rib 2-3 ribs above origin

24
Q

Action of Subcostalis

A

Compresses the intercostal space

25
Q

Origin of Transversus Thoracis

A

Posterior surface of the sternum

26
Q

Insertion of Transversus Thoracis

A

Inner surface of costal cartilage 2-6

27
Q

Action of Transversus Thoracis

A

Compresses the thorax for forced expiration

Muscles O,I&A's (13 decks)

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