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Human Anatomy (kin) > Forearm (Ulna and Radius) > Flashcards

Forearm (Ulna and Radius) Flashcards

1
Q

Is the ulna located laterally or medially in the body?

A

Medial

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2
Q

The Coronoid process articulates with what part of the humerus?

A

Trochlea of the humerus

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3
Q

The Ulnar tuberosity is the attachment pint for which muscle?

A

Brachialis

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4
Q

What is the “elbow” that can be palpated?

A

olecranon process

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5
Q

What is the stabilizing bone of the forearm?

A

Ulna

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6
Q

Which side of the distal end of the ulna is the styloid process located?

A

Medial

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7
Q

Which bone reaches the wrist ONLY?

A

Radius

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8
Q

Does the radius have anything to do with the elbow joint?

A

No.

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9
Q

Describe the shape of the Ulna.

A

Larger towards the humerus, tapers downward to the wrist but does not touch the wrist joint.

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10
Q

What separates the 2 process of the ulna?

A

trochlear notch

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11
Q

What are the 2 processes of the proximal end of the ulna?

A

olecranon process and coronoid process

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12
Q

What is bursitis? How is it caused?

A

inflammation of the bursal sac, direct trauma or repetitive friction

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13
Q

What 2 structure lie between the elbow and the skin?

A

olecranon bursa and triceps tendon

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14
Q

Describe the shape of the radius.

A

Skinny proximally and enlarged distally.

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15
Q

The Ulnohumeral joint (elbow) is what type of joint?

A

Synovial Hinge (uniaxial)

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16
Q

How and why is there a carrying angle? How big is the carrying angle?

A

The trochlea is larger/thicker medially therefore the distal arm migrates laterally to accommodate the width of the hips. Usually the carrying angle is 15 degrees.

17
Q

Is the radiohumeral joint part of the elbow?

A

no

18
Q

Where does the radius articulate with the humerus?

A

Capitulum of the humerus

19
Q

The medial collateral ligament of the elbow extends from where to where?

A

Medial epicondyle of the humerus to the top of the ulna

20
Q

Which collateral ligament restricts a valgus stress?

A

Medial Lateral Collateral ligament (MCL)

21
Q

A valgus force comes from which direction?

A

from lateral side pushing medially

22
Q

Which collateral ligament extends from the lateral epicondyle to the annular ligament?

A

Lateral Collateral Ligament (LCL)

23
Q

A Varus stress is restricted by which collateral ligament?

A

Lateral. (LCL)

24
Q

A Varus force runs from which direction?

A

From the medial side and pushes laterally

25
Q

What type of joint is the proximal radioulnar joint?

A

pivot joint

26
Q

What is the annular ligament composed of?

A

ring of hyaline cartilage

27
Q

What does the annular ligament do?

A

Holds the radial head into the radial notch and allows free rotation of the radius along its longitudinal axis

28
Q

What is the intermediate radioulnar joint?

A

Interosseus Membrane

29
Q

In which direction does the Interossues membrane run?

A

Inferiorly and medially

30
Q

Structurally what type of joint is the intermediate radioulnar joint?

A

Fibrous (for stability)

31
Q

What articulation forms the distal radioulnar joint?

A

Ulnar notch of the radius and the distal end of the ulna.

32
Q

Which radioulnar joint allows for the radius to cross over the ulna in pronation/supination?

A

Distal radioulnar joint

33
Q

What are the 3 radioulnar joint?

A
  • Proximal
  • Intermediate /Interosseus
  • Distal
34
Q

What is the structural classification of the intermediate radioulnar joint?

a) synovial
b) cartilaginous
c) fibrous
d) diarthroses
e) Synarthrosis

A

c) fibrous

35
Q

In full elbow extension, what bony landmark makes contact with the radial fossa of the humerus?

a) olecranon process
b) trochlea
c) Capitulum
d) trochlear notch
e) radial head

A

e) radial head

Human Anatomy (kin) (14 decks)

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