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Theory Exam 4 > Chapter 24 Thoracic Wall > Flashcards

Chapter 24 Thoracic Wall Flashcards

1
Q

What are the origins, insertions, actions, and innervations of the external intercostal muscles?

A
  • Origins: Lower margin of the rib above
  • Insertions: Upper margin of the rib below
  • Actions: Elevation of the ribs during inspiration
  • Innervations: Intercostal nerves T1 to T6
    Thoracoabdominal nerves T7 to T11
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2
Q

What are the origins, insertions, actions, and innervations of the internal intercostal muscles?

A
  • Origins: Upper margin of the rib below; costal cartilage
  • Insertion: Lower margin of the rib above; costal cartilage
  • Actions: Depression of the ribs during expiration
  • Innervations: Intercostal nerves T1 to T6
    Thoracoabdominal nerves T7 to T11
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3
Q

How do the fibers of the external and internal intercostal muscles course?

A
  • External intercostal muscles: course MEDIALLY and INFERIORLY
  • Internal intercostal muscles: course MEDIALLY and SUPERIORLY
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4
Q

Where can the external and internal intercostal muscles be found?

A
  • External intercostal muscles: POSTERIOR to the tubercle of the rib & ANTERIOR to the costochondral junction
  • Internal intercostal muscles: ANTERIOR to the sternum & POSTERIOR to the angle of the rib
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5
Q

What is the neurovascular plane?

A

The area between the internal intercostal muscles and the innermost intercostal muscles

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6
Q

What is contained in that neurovascular plane?

A

Intercostal vein, artery, nerve

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7
Q

What bone structure do the contents in the neurovascular plane sit within?

A

Costal groove on the LOWER surface of the rib

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8
Q

Where can the external intercostal membrane be found?

A

At the costochondral junction

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9
Q

What are the parts of the sternum?

A
  • Manubrium
  • Jugular notch
  • Body
  • Sternal angle
  • Xiphoid process
  • Epigastric fossa
  • Xiphisternal joint
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10
Q

Where is each part of the sternum located?

A
  • Manubrium: superior to the sternum
  • Jugular notch: superior the manubrium
  • Body: middle of the sternum
  • Sternal angle: between the manubrium and the body of the sternum
  • Xiphoid process: inferior portion of the sternum
  • Epigastric fossa: anterior to the xiphoid process
  • Xiphisternal joint: between the xiphoid process and the body
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11
Q

What are the parts of the rib?

A
  • Head
  • Neck
  • Tubercle
  • Body
  • Angle
  • Anterior end
  • Costal groove
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12
Q

Where is each part of the rib located?

A
  • Head: articulates with the bodies of the thoracic vertebrae
  • Neck: lateral to the head
  • Tubercle: lateral to the neck
  • Body: shaft of rib
  • Angle: where the curve is sharpest
  • Anterior end: articulates with the costal cartilage
  • Costal groove: inferior to the body
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13
Q

What are true ribs?

A

The first seven ribs (1-7)

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14
Q

What are false ribs?

A

The last five ribs (8-12)

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15
Q

What are floating ribs?

A

Costal cartilages that end with muscle with no anterior articulation (11 and 12)

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16
Q

What is the costal margin?

A

lower margin of the thoracic wall

17
Q

What is the costal margin formed by?

A

Costal cartilages of ribs 7, 8, 9, and 10

18
Q

What are the boundaries of the superior thoracic aperture?

A

The upper border of the sternum and the first ribs

19
Q

What are the boundaries of the inferior thoracic aperture?

A

Closed by the diaphragm

20
Q

What is the origin, insertion, action and innervation of the diaphragm?

A
  • Origin: Periphery posterior to the xiphoid process; lower 6 ribs; posterior abdominal wall
  • Insertion: Central tendon
  • Action: Inspiration
  • Innervation: Phrenic nerve
21
Q

What is the infrasternal angle?

A

Angle formed by the intersection of the COSTAL MARGINS at the XIPHISTERNAL JOINT

22
Q

What is the name for T12?

A

Subcostal nerve

23
Q

How does an intercostal nerve course?

A

BELOW THE NECK of the rib that numerically corresponds to it

24
Q

What does the lateral cutaneous branch pierce?

A

• Internal intercostal
• External intercostal
• Serratus anterior

25
Q

Where is the serratus anterior found?

A

Majority of the thorax (ribs 1-8)

Theory Exam 4 (7 decks)

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