LECTURE 3 bony thorax, pectoral girdle, thoracic cage Flashcards Preview

anatomy lecture exam 1 > LECTURE 3 bony thorax, pectoral girdle, thoracic cage > Flashcards

Flashcards in LECTURE 3 bony thorax, pectoral girdle, thoracic cage Deck (25):
1

axial skeleton

skull (cranial and facial bones), vertebrae, ribs, sternum

2

appendicular skeleton

bones of upper and lower limbs, girdle bones (scapula, clavicle, pelvis)

3

the bony thorax

sternum, ribs, 2 clavicle, 2 scapula, vertebrae

4

pectoral girdle

scapula and clavicle on each side, attaches upper extremity to axial skeleton, holds upper extremity away from skeleton for mobility

5

mobile articulations of pectoral girdle

acromioclavicular, sternoclavicular

6

borders of thoracic cage

thoracic vertebrae posteriorly; ribs posteriorly, anteriorly, and laterally; sternum, ribs and costal cartilages anteriorly

7

functions of thoracic cage

forms protective cage around heart, lungs, and other organs; mobile for respiration; muscle attachment

8

parts of sternum

manubrium, body (gladiolus), xiphoid process

9

features of manibrium

jugular (sternal) notch, sternal angle - 2nd rib

10

articulations of manibrium

costal cartilages of ribs 1-2

11

feature of body of sternum

xiphosternal joint

12

articulations of body of sternum

costal cartilages of ribs 2-7

13

features of xiphoid process

hyaline cartilage prenatally, eventually becomes bone (40 years); muscle attachment

14

pairs of ribs

12 pairs total, ribs 1-7 true ribs, ribs 8-12 false ribs, ribs 2-9 typical ribs, ribs 1, 10-12 atypical ribs

15

true ribs

ribs 1-7, each has its own costal cartilage for attachment to sternum

16

false ribs

ribs 8-10, have more than one costal cartilage for attachment to sternum (indirect)

17

floating ribs

ribs 11-12, have no attachment to sternum

18

typical ribs

ribs 2-9, attach to 2 thoracic vertebrae at 3 sets of facets (S, I and transverse costal facets)

19

atypical ribs

ribs 1, 10-12, attach at only a single costal facet on each side of 1 thoracic vertebra, 11-12 also do not articulate with a transverse costal facet

20

rib anatomy (typical ribs)

head, neck, tubercle, angle, shaft/body, subcostal groove

21

typical rib articulation

dorsal attachment to thoracic vertebrae, head of rib -> 2 costal facets (superior costal facet, inferior costal facet of vertebra above it, intervertebral disc), tubercle of rib -> transverse costal facet

22

exterior intercostal muscles

origin: inferior border of rib above; insertion: superior border of rib below; fibers run oblique (down and forward); aid in inspiration (elevate ribcage, increase dimension)

23

internal intercostal muscles

origin: superior border of rib below; insertion: inferior border of rib above; fibers run at right angles to external intercostals; aid in expiration (depress ribcage, decrease dimensions)

24

innermost intercostal muscles

subcostals, transversus thoracis; attachments similar to internal intercostals, attach ribs; small, variable, function unclear

25

neurovascular bundle of intercostal muscles

intercostal VAN supplies intercostal muscles in intercostal space; sit in subcostal groove (protected); between internal intercostal and innermost intercostal layers