Sternum and Ribs

Question 1

Thoracic wall components

Answer 1

thoracic vert, intervertebral discs, ribs, sternum.

Question 2

Sternum

Answer 2

3 parts - superior manubrium, narrow longitudinal body, small inferior xiphoid process.

Question 3

Manubrium

Answer 3

Forms part of bony framework of neck and thorax. Superior surface has jugular (supersternal) notch. On both sides are oval fossa for clavicular articulation. Inferior to these fossa are facets for attachment of costal cartilage. Demifacet at bottom

Question 4

Body of sternum

Answer 4

Flat - anterior surface is marked w/transverse ridge. Ribs 3-6.

Question 5

Xiphoid process

Answer 5

Shares facet for rib 7 with body.

Question 6

Ribs

Answer 6

12 pairs - only costal cartilage of upper 7 ribs articulate with sternum. Remaining 5 pairs are false ribs. Costal cartilage of 8-10 articulate anteriorly with above cart. 11, 12 are floating. Intercostal spaces are filled with intercostal muscles.

Question 7

Rib anat

Answer 7

Curved shaft. Head, neck, tuburcle (posterior part). Two facets that articulate with vertebrae. Medial articular facet for transverse process of associate vertebrae.

Question 8

Atypical ribs

Answer 8

Rib 1 - flat in horizontal plane. Head articulates only with body of T1. Superior surface has scalene tuburcle. Rib 11 and 12 have no tuburcles or necks. Relatively short, little curve, pointed anteriorly.

Question 9

Articulation

Answer 9

Head of rib and body of vertebrae.

Tuburcle of the rib and the transverse process.