Antomy - Ribcage

Question 1

what is the structure of the rib cage

4

Answer 1

It is composed of 12 pairs of ribs with their costal cartilages and the sternum.
Sternum :
-the manubrium
-body
-xiphoid process.

Question 2

what is the first rib?
typical rib?
floating rib?
(3)

Answer 2

1) First rib-The first rib is the most tightly curved of all the ribs. It’s also the broadest of the ribs=Atypical
There are more Atypical ribs =>1,2,10,11,12
2) Typical rib=The typical rib consists of a head, neck and body:
3) Floating rib=The last two false ribs (11–12) are also called floating ribs (vertebral ribs). These are short ribs that do not attach to the sternum at all.

Question 3

Features of thoracic vertebrae

4

Answer 3

The ribs are attached to T1–T12 thoracic vertebrae -
The ribs are numbered 1–12 in accordance with the thoracic vertebrae.
True ribs(1-7)
False ribs (8-12)
floating ribs(11-12)

Question 4

features of clavicle and sternum

2

Answer 4

clavicle = collar bone
1) Acromial end (lateral, flattened) Articulates with acromion process of scapula (acromioclavicular joint)

2) Sternal end (medial, rounded) - Articulates with sternum
(sternoclavicular joint)

Question 5

Joints of the sternum

4

Answer 5

1) Sternoclavicular (synovial)
Manubrium & Clavicle
2)Manubrio-sternal (symphysis) = Manubrium & body
3)Xiphisternal (symphysis ) Body and Xiphoid process
4)Sternocostal (aka sternochondral)
-1st costal cartilage & manubrium (fibrous joint)
-2-7th costal cartilage & sternum (synovial)= interchondral ligament

Question 6

structure of intervertebral discs

4

Answer 6

-Hyaline cartilage endplate
-Nuculus pulposus => gelatinous, absorbs compressive force , 70% water
-Annulus Fibrosus : Fibrous layers, resists distension of nucleus
The compression squeeze water out of disc—->disc is 10% shorter & spine is flexible in evening

When we get older , we age: disc dries out !

Question 7

Describe and identify the points of articulation between thoracic vertebrae
(4)
2 joints

Answer 7

Z-joints : Zygapophyseal joints: facet synovial joints between superior & inferior articular processes of adjacent vertebrae .

Intervertebral joints: symphyses between adjacent vertebrae (from C2-S1), the fibrocartilage disc helps absorb shock, bear weight and contributes to 1⁄4 of the height of the spine

Question 8

joints of rib/ verterbrae
Chondral = cartilage
Costal = rib
(3)

Answer 8

1) Costovertebral/Joint of head of rib” (synovial)
Head of rib & vertebral body
2) Costotransverse (synovial) Tubercle of rib & vertebral transverse process
3)Costochondral (cartilaginous, no movement) Rib & costal cartilage