Anatomy of the thorax Flashcards Preview

SEM2 ANATOMY > Anatomy of the thorax > Flashcards

Flashcards in Anatomy of the thorax Deck (89)
Loading flashcards...
1

What is the name given to ribs 1-7? What do they articulate with?

True ribs
Sternum

2

The term 'false ribs' refer to what ribs? What do they articulate with?

8-10
Articulate with sternum indirectly via costal cartilage

3

What is the name given to ribs 11-12? Why?

Floating ribs
No articulation with the sternum

4

What ribs are defined structurally as 'typical ribs'? How many articular facets does a typical rib have?

Ribs 3-9
2 articular facets

5

The costotransverse joins is the name given to the articulation between which two structures?

Tubercle of rib and transverse costal facet of thoracic vertebrae

6

Describe the structures that make up the costovertebral joint...

Articulation between the two articular facets on the head of the rib, and the superior and inferior demifacets on the thoracic vertebral body

7

Costotranverse and costovertebral joints are both what type of joints?

Plane synovial joints

8

What ribs can be structurally classified as atypical?

Ribs 1,2, 10, 11 and 12

9

What are the defining features of rib 1? (4 defining features)

-Short and wide
-Only one articular facet
-Superior surface has two grooves in which subclavian
vessels sit
-Tubercle in-between the two grooves is attachment site
for scalene muscle

10

What are the defining features of rib 2?

Roughed tubercle on superior surface is where serratus anterior attaches

11

What are the defining features of rib 10?

Only 1 articular facet

12

What are the defining features of ribs 11 and 12? (2 features)

-Only 1 articular facet
-No neck

13

What type of cartilage is costal cartilage?

Hyaline type II

14

How many thoracic vertebra are there?

12

15

What are the defining features of thoracic vertebra? (3 features)

-Heart shaped vertebral body
-2 demifacets on vertebral body that articulate with ribs
-Transverse costal facets found on transverse processes
of T1-T10

16

In total, how many articulating surfaces is present on each vertebra?

4

17

What are the borders of the superior thoracic aperture/thoracic inlet?

A - sternal manubrium
P - T1
Lateral - medial margins of 1st rib

18

What are the borders of the inferior throacic aperture/thoracic outlet?

A - costal margin
P - T10
Lateral - ribs 11 and 12

19

What are the 4 thoracic cage muscles?

External intercostals
Internal intercostals
Innermost intercostals
Transversus thoracis

20

What are the 5 accessory muscles of breathing?

Pectoralis major
Pectoralis minor
Scalene
Serratus anterior
Sternocleidomastoid

21

What are the 4 muscles of expiration?

Rectus abdominus
Transverse abdominus
Internal oblique
External oblique

22

EXTERNAL INTERCOSTAL

O - Inferior border of superior rib
I - Superior border of inferior rib
A - Elevates rib, increasing thoracic volume
In - T1-11 intercostal nerves

23

The external IC muscle contracts during which phase of breathing?

Inspiration

24

In what direction do the fibres of the external IC muscle run?

Antero-inferiorly

25

What muscle is continuous with the fibres of the external IC muscle?

External oblique

26

INTERNAL INTERCOSTAL

O - Inferior border of superior rib
I - Superior border of inferior rib
A - Depresses rib, decreasing thoracic volume
In - T1-11 intercostal nerves

27

In which direction do the fibres of the internal IC muscle run?

Infero-posteriorly

28

Internal IC muscle contracts during which phase of breathing?

Expiration

29

What muscle is continuous with the fibres of the internal IC muscle?

Internal oblique

30

INNERMOST INTERCOSTAL

O - Inferior border of superior rib
I - Superior border of inferior rib
A - Depresses rib, decreasing thoracic volume
In - T1-11 intercostal nerves