THORAX

Question 1

types of ribs

Answer 1

1. true (vertebrosternal) 1st-7th
2. false (vertebrochondral) 8th-10th
3. floating (free) 11th-12

Question 2

parts of a typical rib (3rd-9th)

Answer 2

1. Head: superior & inferior articular facets
2. Neck
3. Tubercle: articulates with transverse process of vertebra
4. Body: angle, costal groove

Question 3

Atypical ribs

Answer 3

1. 1st: nearly horizontal
2. 2nd: difference in attachment of serrates anterior & posterior scalene muscles
3. 10th-12th: only 1 facet

Question 4

bones of the sternum

Answer 4

1. manubrium
2. sternal body
3. xiphoid process

Question 5

Joints of the Thoracic Wall

Answer 5

1. intervertebral
2. costovertebral joints (articulate w/ head of ribs)
3. costotransverse joints (articulate w/tubercle of ribs)
4. sternocostal joint (sternum & cartilage)
5. sternoclavicular joint (sternum & clavicle)
6. costochondral joint (rib & cartilage)
7. intercondral joint (cartilage & cartilage)
8. manubriosternal joint (manubrium & sternal)
9. xiphisternal (xiphoid process & sternum)

Question 6

Muscles of Thoracic Wall

Answer 6

1. external intercostal
2. internal intercostal
3. subcostal
4. levatores costarum
5. serrates posterior superior
6. serrates posterior inferior