Thoracic Cage

Question 1

Thoracic cage protects

Answer 1

Chief organs of circulation and respiration

Question 2

Formation of thoracic cage

Answer 2

Anterior-sternum
Posterior-12 thoracic vertebrae and intervertebral disc in bw
Each side-ribs and their cartilage

Question 3

Inlet of thorax

Answer 3

Kidney shaped
Anteroposterior diameter less than transverse diameter

Question 4

Boundaries of inlet

Answer 4

Anterior-upper border of manubrium of sternum
Posterior-1st thoracic vertebrae
On each side-1st rib and its cartilage

Question 5

Outlet

Answer 5

Broad end of thorax surrounds the user part of abdominal cavity separated by/excluding diaphragm

Question 6

Costal margi formed by

Answer 6

Cartilage of 7-10 ribs and 11-12 ribs

Question 7

Boundaries of outlet

Answer 7

Anterior-infrasternal angle bw the 2costal margins
Posterior-12th thoracic vertebrae on each side

Question 8

Ribs

Answer 8

12 pairs
Greater part of thoracic skeleton
Flat,ribbon like,bony arches,one below another
Gap bw adjacent intercostal spaces

Question 9

Classification

Answer 9

True or verteberosternal-1 to 7(cartilage to sterum
False or vertebrochondral-8 to 10(joins to higher cartilage next to them
Floating or vertebral-11th and 12th(free anterior ends
Typical-3 to9
Atypical-1,2,10,11,12

Question 10

Typical ribs

Answer 10

Anterior end-concave depression
Shaft-flattened(inner and outer)
Posterior end-head ,neck and tubercle

Question 11

First rib

Answer 11

Shortest,broadest,most curved
Shaft flattened
Anterior end - larger and thicker
Articulate with 1st costal cartilage
Small,round head

Question 12

Sternum

Answer 12

Flat bone
Forming anterior median part of thoracic skeleton
T shaped vertical bone
Dagger or short sword

Question 13

Parts of sternum

Answer 13

Manubrium-upper
Body
Xiphoid process-lowest tapering part

Leng-15 -17cm

Question 14

Manubrium

Answer 14

Quadrilateral
Thickest and strongest part
2 surfaces-anterior and Posterior
4 borders -superior ,inferior, 2 lateral

Question 15

Superior and inferior border of manubrium

Answer 15

Superior
Thick,round,concave
Suprasternal
and clavicular notch(articulate with medial end of clavicle to form sternoclavicular)

Inferior
2nd cartilaginous joint with body of sternum

Question 16

Body of sternum

Answer 16

Longer,narrower and thinner than manubrium
Lateral borders form synovial joints with 2nd 6th costal cartilage and upper half of 7th costal cartilage
upper end articulate with manubrium
Lower end with xiphisternum

Question 17

Xiphoid process

Answer 17

Smallest part
Varies greatly in size and shape
May show foramen

Question 18

Vertebral column

Answer 18

Main part of axial skeleton
33 bones(intervertebral disc bw)

Question 19

Function s of vertebral column

Answer 19

Support the body weight
Locomotion
Protection of nerve cordsandnerve roots
Transmit the body weight to ground

Question 20

33vertebrae

Answer 20

C7 T12 L5 S5 C4
Cervical
Thoracic
Lumbar
Sacral-fused to form saccrum
Coccygeal-fused- coocyx

Question 21

Length of thespine

Answer 21

Males-28inches
Females-24 inches

Question 22

Contribution of the length of vertebrae

Answer 22

Vertebrae 4/5
Intervertebral disc1/5