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Questions and Answers
What is the shape of the scaphoid bone?
What is the shape of the scaphoid bone?
- Hooklike
- Moon shaped
- Pyramidal shaped
- Boat shaped (correct)
What is the second carpal bone?
What is the second carpal bone?
lunate
What feature characterizes the triquetrum bone?
What feature characterizes the triquetrum bone?
It has 3 articular surfaces and a pyramidal shape.
Which carpal bone is described as pea shaped?
Which carpal bone is described as pea shaped?
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What is the shape of the trapezium bone?
What is the shape of the trapezium bone?
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Which carpal bone is the smallest in the distal row?
Which carpal bone is the smallest in the distal row?
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Which carpal bone is the largest?
Which carpal bone is the largest?
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What unique feature does the hamate bone have?
What unique feature does the hamate bone have?
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Study Notes
Carpal Bones Overview
- The human wrist contains eight carpal bones, crucial for wrist flexibility and movement.
Proximal Row of Carpal Bones
-
Scaphoid:
- Boat-shaped, largest bone in the proximal row.
- Articulates with the radius, helping in wrist stability.
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Lunate:
- Moon-shaped, second carpal bone.
- Also articulates with the radius, contributing to wrist joint formation.
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Triquetrum:
- Possesses three articular surfaces and has a pyramidal shape.
- Connects with the pisiform bone on its proximal side.
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Pisiform:
- Pea-shaped and the smallest carpal bone.
- Located proximal to the triqutrum, aiding finger movement.
Distal Row of Carpal Bones
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Trapezium:
- Four-sided, irregularly shaped bone located distally.
- Plays a key role in forming the base of the thumb.
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Trapezoid:
- Also a four-sided bone but the smallest in the distal row.
- Functions in connecting the hand and wrist.
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Capitate:
- Largest of all carpal bones.
- Fits into a concavity created by the scaphoid and lunate bones, playing a critical role in wrist articulation.
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Hamate:
- Last bone in the distal row, characterized by a hook-like process.
- Provides support for the structure of the hand and attachment points for ligaments.
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