Questions and Answers
Which carpal bone is located on the palmar surface of the triquetrum?
What is the correct order of the distal row of carpal bones from lateral to medial?
Which bone is NOT part of the proximal row of carpal bones?
What unique feature does the hamate bone possess?
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Which of the following correctly identifies the bones in the proximal row from lateral to medial?
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What type of bones are the carpal bones classified as?
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Which of the following bones is found in the distal row of carpal bones?
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Which part of the wrist is medial to the radial styloid process?
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What is the function of sesamoid bones?
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Which type of bone is responsible for protecting the spinal cord?
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Which of the following bones has a hooked process on its palmar side?
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Study Notes
Overview of the Wrist
- The wrist is a short anatomical region connecting the forearm and hand.
- It consists of eight carpal bones, organized into two rows of four bones each.
Proximal Row of Carpal Bones
- Comprises four bones arranged from lateral to medial:
- Scaphoid: Located towards the thumb side; commonly fractured.
- Lunate: Shaped like a crescent; articulates with the radius.
- Triquetrum: Pyramid-shaped; situated beneath the pisiform bone.
- Pisiform: A sesamoid bone located on the palmar surface of the triquetrum; aids in wrist movement.
Distal Row of Carpal Bones
- Contains four bones, arranged laterally to medially:
- Trapezium: Supports the base of the thumb; involved in Thumb opposition.
- Trapezoid: Smallest bone in the distal row; articulates with the second metacarpal.
- Capitate: Largest carpal bone; central in the wrist, articulating with the third metacarpal.
- Hamate: Recognizable by its hooked process on the palmar side, known as the hook of the hamate; can be prone to injuries during activities using the hands.
Wrist Anatomy
- The wrist connects the forearm and hand, composed of eight carpal bones.
- Carpal bones are arranged in two rows of four: proximal and distal.
Proximal Row of Carpal Bones
- Scaphoid: Located laterally; one of the most commonly fractured wrist bones.
- Lunate: Centrally positioned; articulates with the radius.
- Triquetrum: Located medial to the lunate; involved in wrist movement.
- Pisiform: A small bone on the palmar surface of the triquetrum; serves as an attachment point for tendons.
Distal Row of Carpal Bones
- Trapezium: Located laterally; articulates with the thumb (first metacarpal).
- Trapezoid: Second bone in the distal row; contributes to the structure of the hand.
- Capitate: Largest carpal bone; centrally located in the wrist.
- Hamate: Has a hooked process on its palmar side, known as the hook of the hamate; supports the ulnar nerve.
Classification of Bones
- Flat Bones: Protect internal organs; examples include nasal bones and ribs.
- Long Bones: Longer than wide; support weight and facilitate movement; examples include femur and humerus.
- Short Bones: Provide stability with limited movement; examples are carpal and tarsal bones.
- Irregular Bones: Complex shapes that protect internal structures; include the vertebrae and pelvic bones.
- Sesamoid Bones: Embedded in tendons; protect tendons from wear and stress; example includes the patella.
Distal Features of the Wrist
- Ulnar Notch: Medial concavity on the distal end of the radius that accommodates the head of the ulna.
- Radial Styloid Process: Extends from the lateral aspect of the wrist; can be palpated.
- Dorsal Tubercle: Projects from the back of the distal radius; acts as a pulley for tendon function.
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Description
Explore the complex anatomy of the wrist, including its structure and individual carpal bones. This quiz outlines the proximal and distal rows of carpal bones, detailing their locations and functions. Perfect for students studying human anatomy or health sciences.
