The Ulna Anatomy Quiz

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Questions and Answers

How many carpal bones are there in the wrist?

  • 10
  • 8 (correct)
  • 12
  • 6

Each metacarpal bone is associated with a specific digit of the hand.

True (A)

What is the primary function of sesamoid bones?

To alleviate stress on muscles or tendons.

The __________ are the bones of the fingers.

<p>phalanges</p> Signup and view all the answers

Match the following metacarpals with their associated digits:

<p>First metacarpal = Thumb Second metacarpal = Index finger Third metacarpal = Middle finger Fourth metacarpal = Ring finger Fifth metacarpal = Little finger</p> Signup and view all the answers

What is the primary function of the ulna in the forearm?

<p>To act as the stabilizing bone (A)</p> Signup and view all the answers

The head of the ulna is located at the distal end of the bone.

<p>False (B)</p> Signup and view all the answers

What large muscle attaches to the olecranon of the ulna?

<p>Triceps</p> Signup and view all the answers

The ulna articulates with the ________ of the radius to form the distal radio-ulnar joint.

<p>ulnar notch</p> Signup and view all the answers

Which structure is NOT found at the proximal end of the ulna?

<p>Head of the radius (A)</p> Signup and view all the answers

Match the following terms with their functions related to the radius and ulna:

<p>Olecranon = Insertion point for triceps Head of radius = Articulates with the elbow joint Ulnar styloid process = Distal projection of the ulna Radial tuberosity = Attachment site for biceps brachii</p> Signup and view all the answers

Fractures of the distal radius are less common than fractures of the ulna.

<p>False (B)</p> Signup and view all the answers

What is the anatomical position of the ulna in relation to the radius?

<p>Medial side</p> Signup and view all the answers

Flashcards

Carpal Bones

Wrist bones connecting radius/ulna to metacarpals. They are arranged in two rows.

Metacarpal Bones

Five bones forming the middle part of the hand, each paired with a finger.

Phalanges

Finger bones; thumb has 2, other fingers have 3.

Sesamoid Bones

Small bones embedded in tendons near joints; act like pulleys.

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Proximal Row of Carpal Bones

The carpal bones closest to the forearm (radius and ulna) - scaphoid, lunate, triquetrum, and pisiform.

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Ulna

One of two forearm bones that forms the antebrachium, alongside the radius. It's on the medial side of the forearm.

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Olecranon

A bony process on the proximal ulna, serving as an attachment point for the triceps muscle.

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Radius

One of two forearm bones, lying laterally to the ulna, responsible for movement with the rotational pivot around the ulna.

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Radial Head

A disc-shaped structure on the proximal end of the radius that aids in elbow and proximal radio-ulnar joint articulation.

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Ulnar Notch

A concavity on the medial side of the distal radius that articulates with the ulna's head.

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Distal Radius

The lower part of the radius, which articulates with carpal bones (wrist bones) to form the wrist joint.

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Forearm bones

The ulna and radius, together, form the antebrachium (forearm).

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Interosseous membrane

Connective tissue that connects the radius and ulna along their shafts.

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Study Notes

The Ulna

  • The ulna is one of two long forearm bones, forming the antebrachium, spanning from the elbow to the wrist on the medial side of the forearm in anatomical position.
  • The ulna acts as a stabilizing bone, while the radius pivots to produce movement.
  • The proximal end includes the olecranon process (tip), crucial for the triceps insertion, and the coronoid process. It also has a trochlear notch (semilunar notch) and a radial notch.

The Proximal Ulna

  • The proximal end of the ulna articulates with the humerus' trochlea, sometimes called the head of the ulna.
  • Key components include the olecranon, a bony projection that forms part of the trochlear notch.
  • Also the coronoid process and the radial notch positioned on the lateral surface of the trochlear notch.

The Shaft and Distal Ulna

  • The shaft is the long middle portion, attaching to the interosseous membrane, which connects the radius and ulna.
  • The distal end forms a rounded head with a distal projection, the ulnar styloid process.
  • The distal head articulates with the ulnar notch of the radius to create the distal radio-ulnar joint.

The Radius

  • The radius is the other long bone of the forearm, positioned laterally beside the ulna.
  • It pivots around the ulna for movement at the proximal and distal radio-ulnar joints.

The Proximal Radius

  • The proximal end of the radius articulates at the elbow and proximal radioulnar joints.
  • The head of the radius is a disc-shaped structure with a concave surface on top.
  • The neck of the radius is just below the radial head, and the radial tuberosity is connected to the biceps brachii muscle.
  • The shaft expands in diameter distally.

The Distal Radius

  • The distal radial shaft forms a rectangular end.
  • The styloid process extends distally on the lateral side, connecting with the ulnar notch.
  • The distal radius connects with the scaphoid and lunate carpal bones, forming the wrist joint.

The Carpal Bones

  • Eight carpal bones form two rows (proximal and distal).
  • The scaphoid and lunate bones in the proximal row form the wrist joint.

The Metacarpal Bones

  • Five bones form the middle section of the hand, corresponding to the fingers.
  • Each metacarpal bone consists of a base, shaft, and head.
  • They each connect to a corresponding finger with the medial and lateral sides of each metacarpal allowing muscle attachment.

The Phalanges

  • These are the bones of the fingers.
  • The thumb has a proximal and distal phalanx, while other fingers have proximal, middle, and distal phalanges.

Sesamoid Bones

  • Small bones embedded within tendons near joints function as pulleys, reducing stress on the muscle or tendon.

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