The thoracic Wall (Lec 6)

Question 1

number of ribs

Answer 1

12

Question 2

the thoracic cage is bounded by _ ?

Answer 2

by the thoracic
vertebrae, ribs, and sternum

Question 3

the thoracic cage is made by what

Answer 3

cartilage and bones
(Osteo-cartilaginous structure)

Question 4

the thoracic cage encloses what

Answer 4

the thorax and
thoracic viscera

Question 5

the thoracic wall is walled of by_?

Answer 5

by muscles and
connective tissues, with a few
key passageways

Question 6

number of true ribs

Answer 6

(1-7) = 7

Question 7

number of false ribs

Answer 7

(8-10) = 3

Question 8

number of floating ribs

Answer 8

(11-12) = 2

Question 9

insertion of the true ribs

Answer 9

Direct
insertion to sternum
via costal cartilage

Question 10

insertion of the false ribs

Answer 10

ndirect insertion
on sternum via
costal margin

Question 11

insertion of the floating ribs

Answer 11

No
insertion on sternum

Question 12

types of ribs

Answer 12

• true ribs
• false ribs
• floating ribs

Question 13

articulations of a typical rib

Answer 13

1)Head of the rib (posterior; vertebrae)
2) Tubercle of the rib (posterior; vertebrae)
3) Tip of costal cartilage (anterior; sternum)

Question 14

number of articulations of a rib

Answer 14

3

Question 15

posterior joints of the thoracic cage

Answer 15

• Costotransverse Joint
• Costovertebral Joint

Question 16

Costotransverse Joint

Answer 16

(rib @ TP) = Tubercle of the rib articulates
with costal facet on TP of same numbered vertebra

Question 17

Costovertebral Joint

Answer 17

(rib @ VB) = Head of the rib articulates
with two demi-facets: (1) the VB of same numbered vertebra,
and (2) the (inferior) demi-facet of the VB above

Question 18

atypical ribs

Answer 18

1, 10, 11, 12

Question 19

characteristics of the rib 1

Answer 19

• Short, flat and horizontally oriented
• Anterior and posterior grooves for
subclavian vein and artery respectively
• Costovertebral Jt.: Articulates with VB
of own level only (no facet on C7)

Question 20

characteristics of the rib 10

Answer 20

Costovertebral Jt.: Articulates with VB
of own level only

Question 21

characteristics of the rib 11-12

Answer 21

• Costovertebral Jt.: Articulates with VB
  of own level only
• No tubercles or necks
  • Short (floating)

Question 22

How many facets there are on the sternum

Answer 22

the true ribs = 7

Question 23

level of the jugular notch

Answer 23

T2

Question 24

level of the manubriosternal joint

Answer 24

T4/T5

Question 25

level of the xiphisternal joint

Answer 25

T9

Question 26

where’s the costochondral joint

Answer 26

between the costal cartilage and the ribs

Question 27

classification of the costochondral joint

Answer 27

solid, synchondrosis joint

Question 28

where’s the sternocostal joint

Answer 28

between the costal cartilage and the ribs

Question 29

name of the sternocostal joint on the #1 rib

Answer 29

synchrondrosis

Question 30

classification of the sternocostal

Answer 30

synovial, plane/gidling

Question 31

where’s the interchondral joint

Answer 31

between costal cartilage of ribs 6-10 (variable b/w 6 and 7)

Question 32

classification of the interchondral joint

Answer 32

uniquely synovial

Question 33

pump-handle movement

Answer 33

Volume of the
thoracic cavity
changes in an
anterior to
posterior axis

Question 34

Bucket-Handle
Movement

Answer 34

Lateral (side-to-
side) changes in
thoracic cavity
volume

Question 35

is the movement of the thoracic cage is smaller superiorly or inferiorly

Answer 35

Smaller
movement
superiorly,
larger
movement
inferiorly

Question 36

where’s happen the pump-handle movement

Answer 36

Costotransverse/
vertebral
joints for ribs ~1-6

Question 37

where’s happen the bucket-handle movement

Answer 37

Costotransverse, costovertebral, and
sternocostal joints (6, 7) for ~ribs 6-12

Question 38

fiber orientation of the external intercostal muscles

Answer 38

from origin to
insertion, anterior and inferior

Question 39

function of the external intercostal muscles

Answer 39

Elevates ribs; forceful inspiration

Question 40

fiber orientation of the internal intercostal muscles

Answer 40

from origin to
insertion, posterior and inferior

Question 41

function of the internal intercostal muscles

Answer 41

Depresses ribs; forceful expiration

Question 42

fiber orientation of the innermost intercostal muscles

Answer 42

posterior, inferior (like
internal intercostals)

Question 43

function of the innermost intercostal muscles

Answer 43

Depresses ribs;
forceful expiration

Question 44

function of the transverses thoracis

Answer 44

Depresses ribs; forceful
expiration

Question 45

where’s the transverses thoracis

Answer 45

Sternum body & xiphoid
process to ribs 2-6

Question 46

dermatome

Answer 46

Area/region of
skin innervated by a single spinal nerve

Question 47

where happened the Shingles (Varicella zoster virus)

Answer 47

infection likely
at level of T5

Question 48

pain or rash

Answer 48

pathology
associated with one nerve root

Question 49

where are the thoracic dermatomes

Answer 49

• T4 – Nipple
• T6 – Skin over xiphoid process
• T10 – Umbilicus

Question 50

Venous drainage

Answer 50

paired a/v for p.i.c., a.i.c., internal
thoracic, but posterior drainage differs

Question 51

Clinical significance of
neurovascular bundle location:

Answer 51

Insertion of a
chest tube

Question 52

hoe the thoracic cavity changes volume

Answer 52

in a superior to
inferior axis