Radiographic Anatomy
Skeletal System
Bony Thorax & shoulder Girdle
Educational Objectives
By the end of this lecture you should be able to:

Identify the anatomical parts of bony thorax on diagrams and
radiographs.

Identify the different joints of bony thorax and classify their
type of movement.
State the surface land marks of bony thorax and explain its
importance in radiographic positioning
Explain how to hang radiographs of bony thorax on the view
box
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
References
1. Text book of radiographic positioning and related anatomy; by
Kenneth L.Bontrager,6th edition.
2. Introduction to Human Anatomy and Physiology: by Eldra
Pearl Solomon:W.B.Saunders Company
3. Handbook of Anatomy and physiology for Students of Medical
Radiation Technology: Mallett.M:Jaspar
Websites
http://www6.district125.k12.il.us/science/anatomy/
http://www.innerbody.com/htm/body.html
http://www.e-radiography.net/
http://www.getbodysmart.com/index.htm
4
Outlines ( Bony Thorax)
■ Sternum: anterior
■ Thoracic vertebrae: posterior
■ Ribs (12 pairs) : connecting
Bony Thorax ( Sternum)
Flat bone with three divisions
• Manubrium:
• Upper portion
• 2 inches
• Indentations (jugular, clavicular, costal)
• Body:
•
Middle portion
• 5 inches
• Costal notches
• Xiphoid process:
• Lower portion
• Small
• Vary in size and shape
Bony Thorax ( RIBS)
1. Vertebral end: posterior
• Head: articulate with body of Thoracic vertebra
• Neck:
• Tubercle: articulate with Trans.Process.1
2
2. Shaft: lateral  forward  downward
• Costal Angle:
• Costal groove: artery, vein, nerve
3. Sternal end: anterior
• 3 to 5 inches lower than vertebral end

The rib cage is part of the axial skeleton
and assist in breathing as well as protect
internal organs.
3
Bony Thorax ( RIBS)



The rib cage is part of
the axial skeleton
Assist in
Breathing
Protect internal organs.
Bony Thorax ( RIBS)
Elongated, flattened, and twisted bones
Sternum
Sternum Sternal end
Ribs
Costal Cartilage
Head
Body
Vertebra
Costal Cartilage
Angle
Vertebral end
Bony Thorax ( RIBS)
Sternum
Sternum Sternal end
Ribs
Costal Cartilage
Head
Body
Vertebra
Vertebra
Angle
Vertebral end
Bony Thorax ( RIBS)
1. Ribs
2. Clavicle
3. Sternum
superimposed over
heart and Vertebrae
1
2
2
3
Shoulder Girdle( Clavicles & Scapulae)



The pectoral girdle- consist of
the scapula and clavicle, attaches
upper limbs to axial skeleton,
and provides attachment sites
for muscles
A. Clavicles-also called the
collarbone, they are long bones.
B. Scapulae-also called
shoulder-blades, they are flat
bones with three borders.
Scapula
Clavicle
Shoulder Girdle

Shoulder or Pectoral
Girdle


Clavicle- attaches to
sternum and scapula
Scapula



Acromion Processes
Coracoid processes
Glenoid cavity- holds
humeral head
Shoulder Joint




The glenohumeral joint
Articulation between the
humeral head and the Glenoid
fossa of the scapula
The glenohumeral joint is a balland-socket joint that allows for
the arm to move in a circular
rotation as well as movement of
the arm towards and away from
the body.
The acromio clavicular joint
Articulation between the lateral
end of the clavicle and the
Acromion process of the scapula
A.C Joint
glenohumeral
joint
Shoulder Joint
Shoulder Joint
Shoulder Joint
1. Clavicle
2. Acromioclavicular joint
3. Acromion
4. Greater tubercle of humerus
5. Head of humerus
6. Lesser tubercle of humerus
7. Surgical neck of humerus
8. Coracoid process
9. Glenoid fossa
10. Shoulder joint
11. Lateral border of scapula
AP Shoulder
THANK
YOU