Anatomy #18 [thoracic bones]

We have ______ of ribs which attached posteriorly to _______

12 pairs, thoracic vertebrae

head of rib has __ facets for articulation with ________ and that of vertebrae immediately above

2, numerically corresponding vertebral body

posterior to Scalene tubercle is ______ where _______ cross the rib and lie in contact with bone

Subclavian groove, subclavian artery & lower trunk of brachial plexus

Tubercle of rib is ______ at junction of neck with shaft

a prominence on outer surface of rib

Cartilages of 11th and 12th ribs end in ____

abdominal musculature

Sternal angle (________ ) formed by articulation of _________

angle of Louis, manubrium with sternal body,

Costal cartilages are ______ connecting _______ to lateral edge of sternum and _______ to cartilage immediately above

bars of hyaline cartilage, upper 7 ribs, 8th, 9th, 10th ribs

Why atypical 1st rib is clinically important?

because of its close relationship to lower nerves of brachial plexus & main vessels to arm (subclavian artery and vein)

Xiphisternal join lies opposite to _____

body of T9

Thoracic cage is _____, has ______ superiorly and _______ inferiorly

cone-shaped, narrow inlet, broad outlet

Neck of rib is _____ between ____

constricted portion, head and tubercle

anterior end of each rib attached to _____

corresponding costal cartilages

8th, 9th and 10th ribs attached anteriorly to ___ and to 7th ribs by means of ______

each other, their costal cartilages & small synovial joints

Costal cartilages contribute to ____ and ______ of thoracic wall

elasticity, mobility

chest cage is _____ from front to back

flattened

1st rib is ___ and has ____ (a tubercle on its inner border) for insertion of _____

flattened from above downward, Scalene tubercle, scalenus anterior muscle

11th and 12ribs have no anterior attachment and referred as ________

floating ribs

a rib has ____, ___, ____, _____ and ___

head, neck, tubercle, shaft, angle

function of cage is to participate _______ and _______

in breathing, protect thoracic viscera (heart, lungs) and upper abdominal viscera (liver, spleen, stomach)

Sternal angle lies opposite to _____

intervertebral disc between T4 and T5

shaft or body is ______ and twisted on its long axis

long and thin

typical rib is ________ having ______ superior border and _________ inferior border

long, twisted, flat bone rounded, smooth, sharp, thin

On each sides of sternal body are notches for articulation with _________ and _____

lower part of 2nd costal cartilage, 3rd-7th costal cartilages

3 parts of sternum?

manubrium sterni, sternal body, xiphoid process

Sternal body articulates with _______ above by means of _____, and below with ______ at _________

manubrium, fibrocartilaginous joint (manubriosternal joint), xiphoid process, xiphisternal joint

Sternum lies in ___

midline of anterior chest wall

Inferior border of typic ribs ______ and forms _____ which accomodates intercostal vessels and nerves

overhang, costal groove

No _____ or ______ attached to xiphoid process

ribs, cartilages

Angle of ribs is where _______

shaft bends sharply forward

Upper 7 pairs of ribs attached anteriorly to ______ by their costal cartilages

sternum

Thorax (chest) has in its walls a bony and cartilaginous cage formed by ?

sternum, costal cartilages, ribs, bodies of thoracic vertebrae

Anterior to Scalene tubercle, _____ crosses rib

subclavian vein

In old age, costal cartilages lose its flexibility as a result of ________

superficial calcification

2nd to 7th costal cartilages articulate with sternum at ________

synovial joints

Xiphoid process is ______ part of sternum and is a _________ at its proximal end in adult life

the lowest and smallest, thin plate of hyaline cartilage that becomes ossified

Tubercle has facet for articulation with _____

transverse process of numerically corresponding vertebrae

Sternal angle can be recognised by the presence of ________ which lies at ___ (point from which all CC and ribs are counted)

transverse ridge on anterior aspect of sternum, level of 2nd CC

Manubrium is ____ and articulates with _____ and ________ on each sides

upper part of sternum, clavicles, costal cartilages of C1 and upper part of C2