Podcast
Questions and Answers
What are true ribs?
What are true ribs?
How many pairs of ribs form the walls of the bony thorax?
How many pairs of ribs form the walls of the bony thorax?
Floating ribs attach directly to the sternum.
Floating ribs attach directly to the sternum.
False
What bones make up the shoulder girdle?
What bones make up the shoulder girdle?
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The clavicle helps prevent shoulder dislocation.
The clavicle helps prevent shoulder dislocation.
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What is the number of bones in the appendicular skeleton?
What is the number of bones in the appendicular skeleton?
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What is the glenoid cavity?
What is the glenoid cavity?
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What is the primary bone in the arm?
What is the primary bone in the arm?
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The shoulder girdle is heavily reinforced by ligaments to prevent dislocation.
The shoulder girdle is heavily reinforced by ligaments to prevent dislocation.
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Which of the following is NOT a process of the scapula?
Which of the following is NOT a process of the scapula?
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Study Notes
Ribs
- Twelve pairs of ribs form the thoracic cage walls
- Ribs articulate with the vertebrae posteriorly
- Ribs curve downward and anteriorly
- True ribs (first seven): attach directly to the sternum via costal cartilage
- False ribs (next five): attach indirectly to the sternum or not at all
- Floating ribs (last two pairs): lack sternal attachments
Sternum
- The sternum is a flat bone in the center of the chest
- The true ribs attach to the sternum via costal cartilages
Scapulae (Shoulder Blades)
- Paired, triangular-shaped bones
- Not directly connected to the axial skeleton
- Held in place by trunk muscles
- Superior, medial (vertebral), and lateral (axillary) borders and angles
- Glenoid cavity: shallow socket for humerus head
- Acromion: enlarged lateral end of the scapular spine
- Coracoid process: beak-like projection projecting over the shoulder
Clavicles (Collarbones)
- Slender, doubly curved bones
- Medially attached to the sternum (sternal end)
- Laterally attached to the scapula
- Acts as a brace to hold the arm away from the thorax, preventing dislocation
Appendicular Skeleton
- Composed of bones of the limbs and girdles (shoulder and pelvic)
- 126 bones in total
Bones of the Upper Limbs
- Thirty separate bones make up the upper limb skeleton
- Includes the arm, forearm, and hand
Humerus
- Single bone in the arm
- Typical long bone
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Description
Dive into the intricacies of the thoracic cage and shoulder girdle in this anatomy quiz. Explore the structure and function of ribs, sternum, scapulae, and clavicles. Perfect for students studying human anatomy and physiology.
