Lecture 34 - bony thorax and thoracic wall

Question 1

line coursing down medial portion of sternum

Answer 1

midsternal line

Question 2

line coursing down anterior thorax, which forms a perpendicular relationship with the midpoint of the clavicle

Answer 2

midclavicular line

Question 3

line down midaxillary region

Answer 3

midaxillary line

Question 4

line coursing down anterior and posterior axillary folds

Answer 4

anterior and posterior axillary lines

Question 5

a line down either side of the posterior thorax just lateral to the transverse processes of the thoracic vertebrae

Answer 5

paravertebral line

Question 6

boundaries of the thorax

Answer 6

12 pairs of ribs with intercostal spaces and costal cartilages, sternum, 12 thoracic vertebrae, superior thoracic inlet, inferior thoracic inlet

Question 7

3 parts of the sternum

Answer 7

manubrium, body, xiphoid process

Question 8

parts of manubrium

Answer 8

suprasternal notch, clavicular notches, notch/facet for first rib

Question 9

the body of the sternum articulates with the manubrium at the

Answer 9

sternal angle of louis (manubriosternal joint)

Question 10

the body of the sternum accommodates the costal cartilage of the

Answer 10

2nd rib

Question 11

the body of the sternum has articular facets that accommodate the costal cartilages of

Answer 11

ribs 3-6 (rib 7 is a demifacet arrangement)

Question 12

the xiphoid process articulates with the body of the sternum at the

Answer 12

xiphisternal joint

Question 13

true ribs & meaning

Answer 13

ribs 1-7

attach directly to sternum

Question 14

false ribs & meaning

Answer 14

ribs 8-10

attach to rib 7

Question 15

floating ribs

Answer 15

ribs 11-12

Question 16

typical ribs

Answer 16

ribs 3-9

Question 17

what do typical ribs have

Answer 17

head, neck tubercle (with articular facet), angle, shaft with costal groove

Question 18

atypical ribs

Answer 18

1, 2, 10-12

Question 19

1st rib differences

Answer 19

no costal groove, no angle

Question 20

2nd rib differences

Answer 20

flattened, angle is closer

Question 21

10th rib differences

Answer 21

no articular facet on the tubercle

Question 22

11 and 12th rib differences

Answer 22

no tubercle, 12th has no costal groove

Question 23

joints formed by the heads of the ribs with the vertebral body demifacets; synovial (gliding) joints

Answer 23

vertebrocostal joints

Question 24

joints formed by the articulation of the tubercular facet on the rib with the corresponding vertebral transverse process; synovial (gliding) joints

Answer 24

transversocostal joints

Question 25

articulations between the ribs and the sternum; cartilaginous (minimal movement)

Answer 25

sternocostal (chondrosternal) joints

Question 26

the intercostal nerves supply the

Answer 26

intercostal muscles

Question 27

lie below the 12th ribs, help supply innervation to the abdominal mx

Answer 27

2 subcostal nerves

Question 28

pairs of posterior intercostal arteries

Answer 28

11

Question 29

the lower 9 pairs of posterior intercostal arteries arise from the

Answer 29

thoracic aorta (the lower 5 are from musculophrenic br.)

Question 30

the upper 2 arteries arise from the

Answer 30

costocervical trunk (br. of subclavian artery)

Question 31

the posterior intercostal arteries form anastomoses with

Answer 31

anterior intercostal arteries

Question 32

intercostal muscles

Answer 32

external intercostal muscles, internal intercostal muscles, and innermost intercostals

Question 33

function of external intercostals

Answer 33

inspiration

Question 34

function of internal and innermost intercostals

Answer 34

forced exhalation

Question 35

external intercostals attach to the ___ via the ___

Answer 35

sternum, external intercostal membrane

Question 36

internal intercostals attach to the ___ via the ___

Answer 36

vertebrae, internal intercostal membrane

Question 37

begins as transverse thoracic and continues to spine as innermost intercostal membrane

Answer 37

innermost intercostals