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The muscles of the thoracic cage Flashcards

1
Q

how many muscles make up the thoracic cage?

A

There are five muscles that make up the thoracic cage

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2
Q

what are the muscles that make up the thoracic cage?

A

intercostals (external, internal and innermost),
subcostals,
transversus thoracis

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3
Q

what do the muscles of the thoracic cage act to do?

A

change the volume of the thoracic cavity during respiration

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4
Q

what other muscles are there aside from the ones that make up the thoracic cage?

A

There are some other muscles that do not comprise the thoracic wall, but do attach to it

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5
Q

what are the muscles that attach to the thoracic wall?

A

pectoralis major, minor
serratus anterior
scalene muscles

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6
Q

which muscles lie in the intercostal spaces between ribs?

A

The intercostal muscles lie in the intercostal spaces between ribs

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7
Q

how are the intercostal muscles arranged?

A

into 3 layers:
External Intercostals
Internal Intercostals
Innermost Intercostals

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8
Q

how many pairs of external intercostal muscles are there?

A

There are 11 pairs of external intercostal muscles

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9
Q

where do the external intercostal muscles travel?

A

They run inferoanteriorly from the rib above to the rib below

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10
Q

what are the external intercostal muscles continuous with?

A

continuous with the external oblique of the abdomen

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11
Q

what does the external intercostal muscle originate?

A

at the lower border of the rib

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12
Q

where does the external intercostal muscle insert into?

A

inserting into the superior border of the rib below

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13
Q

what is the action of the external intercostal muscle?

A

Elevates the ribs, increasing the thoracic volume

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14
Q

what is the innervation of the external intercostal muscle?

A

Intercostal nerves (T1-T11)

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15
Q

where do the internal intercostal muscles lie?

A

These flat muscles lie deep to the external intercostals

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16
Q

where do the internal intercostal muscles run?

A

Like the external intercostals, they run from the rib above to the one below, but in an opposite direction (inferoposteriorly)

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17
Q

what is the internal intercostal muscle continuous with?

A

They are continuous with the internal oblique muscle of the abdominal wall

18
Q

what is the origin of the internal intercostal muscle?

A

Originate at the lower border of the rib
Actions: The interosseous part reduces the thoracic volume by depressing the ribcage, and the interchondral part elevates the ribs.
Innervation: Intercostal nerves (T1-T11)

19
Q

where does the internal intercostal muscle insert into?

A

inserting into the superior border of the rib below

20
Q

what are the 2 parts of the internal intercostal muscle?

A

interosseous and interchondral

21
Q

what is the action of the interosseous part of the internal intercostal muscle?

A

reduces the thoracic volume by depressing the ribcage

22
Q

what is the action of the interchondral part of the internal intercostal muscle?

A

elevates the ribs

23
Q

where do the innermost intercostal muscles lie? what are they similar in structure to?

A

These muscles are the deepest of the intercostal muscles, and are similar in structure to the internal intercostals

24
Q

what are innermost intercostal muscles separated from the internal intercostals by?

A

They are separated from the internal intercostals by the intercostal neurovascular bundle

25
Q

where are intercostal neurovascular bundle found?

A

in the most lateral portion of the intercostal spaces

26
Q

where do the innermost intercostal muscles originate from?

A

Originate at the lower border of the rib

27
Q

where do the innermost intercostal muscles insert into?

A

superior border of the rib below

28
Q

what are the different sections of the innermost intercostal muscles?

A

interosseous part and interchondral part

29
Q

what is the action of the interosseous part of the innermost intercostal muscles?

A

reduces the thoracic volume by depressing the ribcage

30
Q

what is the action of the interosseous part of the innermost intercostal muscles?

A

elevates the ribs

31
Q

what is the nerve innervation of the innermost intercostal muscles?

A

Intercostal nerves (T1-T11)

32
Q

what are the muscles of the thoracic cage continuous with? where?

A

These muscles of the thoracic cage are continuous with transversus abdominis inferiorly

33
Q

where does the transversus abdominis originate from? attach?

A

From the posterior surface of the inferior sternum to the internal surface of costal cartilages 2-6

34
Q

what is the action of the transversus abdominis?

A

Weakly depress the ribs

35
Q

what is the innervation of the transversus abdominis?

A

Intercostal nerves (T1-T11)

36
Q

where are the subcostal muscles found?

A

in the inferior portion of the thoracic wall. The direction of the fibres parallels that of the innermost intercostal

37
Q

what do the subcostal muscles consist of?

A

They comprise of thin slips of muscle, which run from the internal surface of one rib, to second and third ribs below

38
Q

what do the direction of the fibres of subcostal muscle run?

A

The direction of the fibres parallels that of the innermost intercostal

39
Q

what is the attachment of the subcostal muscle? origin and insertion

A

These originate from the inferior surface of the lower ribs, near the angle of the rib. They then attach to the superior border of the rib 2 or 3 below

40
Q

what is the action of the subcostal muscle?

A

Share the action of the internal intercostals

41
Q

what innervates the subcostal muscle?

A

Intercostal nerves

Resp (24 decks)

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