Thoracic Wall chp 23/mediastinum chp 24 Flashcards Preview

Anatomoy 3 > Thoracic Wall chp 23/mediastinum chp 24 > Flashcards

Flashcards in Thoracic Wall chp 23/mediastinum chp 24 Deck (31):
1

Sternum (breast bone)

Flat bone, anterior midline of thorax. Consists of manubrium, body, xiphoid process

2

Manubrium

Superior sternum, jugular notch, articulates w first 2 costal cartilage and clavicles

3

Body

middle sternum, long, narrow, thin, articulates w cc of ribs 2-7, has sternal angle (imp landmark for counting ribs)

4

Xiphoid process

small, variable, inferior sternum, has epigastric fossa - pit of stomach - ant. Has xiphisternal joint

5

Ribs (costae)

12 pairs, flat, course ant/inf - head to body, neck, tubercle to transverse process, body, angle, anterior end articulates w costal cartilage

6

Costal groove

Inf shaft of rib, VAN (sup to inf)

7

True/False/Floating

1-7 / 8-12 / 11-12

8

Costal margin / infrasternal angle

cc of 7 - 10 / intersection of costal margin at xiphisternal joint

9

Superior / inferior thoracic aperature

upper border of sternum and first ribs, great vessels and visceral ascend and descend btw thorax and neck / diaphragm, IVC, esophagus and aorta

10

External intercostal muscles

11, inf to sup, external intercostal membrane at costochondral jxn Elevation = Inspiration
Intercostal (T1-T6) and thoracoabdominal (T7-T11)

11

Internal intercostal muscles

sup to inf - internal intercostal membrane at intercostal spaces
Expiration
Intercostal (T1-T6) and thoracoabdominal (T7-T11)

12

Innermost intercostal muscles

11, same O, I, and N as internal, separated by internal vessels and nerves by neurovascular plane

13

Thoracic nerves

12, traverse intervertebral foramen, divide into ventral and dorsal rami

14

Dorsal rami

post, into medial and lateral branches

15

Ventral rami

largest, forward into intercostal spaces,
T1 - T6 = intercostal nerves (proper)
T7 - T11 = Thoracoabdominal nerves
T12 = subcostal nerve

16

Intercostal nerve course

below neck of numerical rib, in neurovascular plane, in costal groove VAN, lateral cutaneous branch (serratus ant into ant/post supplies skin of chest wall) and anterior cutaneous branch (pectoralis to skin of front of chest)

17

Mediastinum

interpleural space - space btw right/left pleura - all organs of thorax except lungs
extends ant from sternum to post vertebral column
extends from thoracic inlet sup to diaphragm inf

18

Pleura

thin serous membrane in thoracic cavity in left/right side - double layer = inner mesothelium, outer connective tissue

19

Visceral pleura

Covers lungs except hilus, dips into fissures btw lobes, few nerves, blood supply via bronchial arteries from des thoracic aorta

20

Parietal pleura

lining of thoracic wall, diaphragm, and mediastinum, rich nerve and vessel supply, derived from post intercostal and internal thoracic arteries.

21

4 subdivisions of parietal pleura

Costal parietal pleura = sternum, ribs, intercostal muscles
Cupolar (cervical) parietal pleura = over apex of lungs, up to neck of first rib
Diaphragmatic p p = upper surface of diaphragm
Mediastinal p p = forms lateral boundaries of mediastinum

22

Recesses

where 2 parts of P P join - not occupied by lung =
costomediastinal recess - jxn of costal and mediastinal, ant border of lung fills during strenuous breathing
Costodiaphragmatic recess - jxn of costal and diaphragmatic, inf border of lung fills during strenuous breathing

23

Pleural Cavity

space btw parietal and visceral pleura
capillary thickness, thin film of fluid, negative pressure (keeps visceral pleura (lungs) by parietal pleura (thoracic chest wall and diaphragm)). So if diaphragm moves, so does lung = breathing

24

Atelectasis

Collapse of lung

25

Pneumothorax

air in pleural cavity

26

Anterior Mediastinum

Loose connective tissue, thymus

27

Superior Mediastinum

thymus, great vessels, trachea, esophagus, thoracic duct, vagus, phrenic, azygos vein

28

Middle Mediastinum

heart, great vessels, pericardium, phrenic

29

Posterior Mediastinum

thoracic aorta, esophagus, thoracic duct, vagus, azygos vein

30

Diaphragm

forms the inf boundary of thorax
O: periphery post to xiphoid process, lower 6 ribs, post abd wall
I: Central tendon
N: Phrenic nerve
A: Inspiration

31

Openings of Diaphragm

T8 - IVC
T10 - Esophagus, Vagus
T12 - Aorta