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Flashcards in Thorax Deck (14)
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1

What are the three types of ribs

True (1-7)

False (8-10)

Floating (11-12)

2

Explain the parts of a typical rib (3-9)

Head
Neck
Tubercle
Body
Costal grove

3

Describe the first rib

Broad
Shortest
Most sharply curved
Contributes to the roof more then the wall of the thoracic cavity
Two groves that are separated by the scalene tubercle

4

Describe the 10-12 ribs

Only have facets on their heads
11 and 12 are short and have no necks or tubercles

5

What are characteristic features of thoracic vertebrae

Bilateral superior and inferior costal facets (demifacets) on their body's for articulating with the heads of ribs

Costal facets on the transverse process for articulating with the tubercles of ribs

Long inferiority slanting spinous processes that overlap the IV disc and vertebra

6

Muscles of the thoracic wall

External intercostal
Internal intercostal
Innermost intercostal
Transverse thoracis
Subcostal
Levatores costarum
Serratus posterior superior
Serratus posterior inferior

7

External intercostal

Superior = inferior border of ribs

Inferior = superior border of ribs below

Innervation = intercostal nerve

Main action = during forced inspiration elevate ribs

8

Internal intercostal

Superior - inferior border of ribs

Inferior - superior border of ribs below

Innervation - intercostal nerve

Main action - during forced respiration interosseus part depresses ribs interchondral part elevates ribs

9

Transversus thoracis

Superior - posterior surface of lower sternum

Inferior - internal surface of costal cartilages 2-6

Innervation - intercostal nerve

Main action - weakly depresses ribs

10

Subcostal

Superior - internal surface of lower ribs near their angles

Inferior - superior borders of 2 or 3 ribs below

Innervation - intercostal nerve

Main action - act in some manner as internal intercostal muscles

11

Levatores costarum

Superior - transverse process of c7-t11

Inferior - subjacent ribs between tubercle and angle

Innervation - posterior rami of c8-t11

Main action - elevate ribs

12

Serratus posterior superior

Superior - nuchal ligament spinous process of c7-t3

Inferior - superior borders of 2-4 ribs

Innervation - 2-5 intercostal nerves

Main action - elevate ribs

13

Serratus posterior inferior

Superior - inferior borders of 8-12 ribs near their angles

Inferior - spinous process of t11-L2

Innervation - 9-11 intercostal nerves subcostal (t12)

Main action - depress ribs

14

Mediastinum

Covered on each side of the pleura and contains the thoracic viscera and structures except the lungs
Extends from the superior thoracic aperture to the diaphragm inferiorly and from the sternum and costal cartilages
Highly mobile region because it consists primarily of hollow visceral structures