Week 4 - Elbow Joint Flashcards

1
Q

Define the elbow joint

A

Hinge joint

Formed by:

  • Trochlea + capitulum of humerus
  • Trochlear notch of ulna
  • Head of radius.
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2
Q

What are the anatomical components of the elbow joint

A

Articular capsule

Ulnar collateral ligament

Radial collateral ligament

Anular ligament of the radius

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3
Q

What movements occur at the elbow joint

A

Flexion + extension

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4
Q

Describe the anterior part of the articular capsule of the elbow joint

A

From radial + coronoid fossae of humerus

To coronoid process of the ulna + the anular ligament of the radius.

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5
Q

Where does the posterior part of the articular capsule of the elbow joint extend from and to?

A

Extends from:

  • Capitulum
  • Olecranon fossa
  • Lateral epicondyle of humerus

Extends to:

  • Anular ligament of radius
  • Olecranon of ulna
  • Ulna posterior to radial notch.
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6
Q

Describe the look of the ulnar collateral ligament

A

Thick + triangular ligament

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7
Q

Describe location of the ulnar collateral ligament

A

Extends from:

  • Medial epicondyle of humerus

Extends to:

  • Coronoid process
  • Olecranon of ulna.

Part of this deepens the socket for the trochlea of the humerus.

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8
Q

Describe the look of the radial collateral ligament

A

Strong + triangular ligament

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9
Q

Describe location of the radial collateral ligament

A

Extends from the lateral epicondyle of the humerus to the anular ligament of the radius + radial notch of the ulna.

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10
Q

Anular ligament of the radius

A

Strong band encircling head of radius holding it in radial notch of the ulna.

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11
Q

What muscles of the arm FLEX the radius + ulna?

A

Biceps brachii

Brachialis muscles

Brachioradialis muscles

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12
Q

What muscles of the arm EXTEND the radius + ulna?

A

Triceps brachii

Anconeus

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13
Q

Origin for biceps brachii muscle

A

LONG HEAD originates from tubercle above glenoid cavity of scapula.

SHORT HEAD originates from coracoid process of scapula.

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14
Q

Insertion point for biceps brachii muscle

A

Radial tuberosity of radius + bicipital aponeurosis

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15
Q

What actions does the biceps brachii allow?

A

Flexion of forearm at elbow joint

Supinates forearm at radionulnar joint

Flexion of arm at shoulder joint

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16
Q

Origin for brachialis muscle

A

Distal, anterior surface of humerus.

17
Q

Insertion for brachialis muscle

A

Ulnar tuberosity + coronoid process of ulna.

18
Q

Action of brachialis muscle

A

Flexes forearm at elbow joint

19
Q

Origin for brachioradialis

A

Lateral border of distal end of humerus

20
Q

Insertion for brachioradialis

A

Superior to styloid process of radius

21
Q

Actions of brachioradialis muscle

A

Flexion of forearm at elbow joint

Supination + pronation of forearm at radioulnar joints to neutral position.

22
Q

Origin for triceps brachii

A

LONG HEAD originates from infraglenoid tubercle (projection inferior to glenoid cavity of scapula).

LATERAL HEAD originates from lateral + posterior surface of humerus.

MEDIAL HEAD originates from entire posterior surface of humerus.

23
Q

Insertion for triceps brachii

A

Olecranon of ulna

24
Q

Action of the triceps brachii

A

Extension of forearm at elbow joint

Extension of arm at shoulder joint

25
Origin for anconeus
Lateral epicondyle of humerus.
26
Insertion for anconeus
Olecranon + superior portion of shaft of ulna.
27
Action for anconeus muscle
Extension of forearm at elbow joint
28
Origin for pronator teres
Medial epicondyle of humerus + coronoid process of ulna.
29
Insertion for pronator teres
Midlateral surface of radius
30
Action for pronator teres
Pronation of forearm at radioulnar joints Weakly flexes forearms at elbow joint.
31
Origin for pronator quadratus
Distal portion of shaft of ulna
32
Insertion for pronator quadratus
Distal portion of shaft of radius.
33
Action of pronator quadratus
Pronation of forearm at radioulnar joints.
34
Origin for supinator muscle
Lateral epicondyle of humerus + supinator crest.
35
Insertion for supinator muscle
Lateral surface of proximal 1/3rd of radius.
36
Action of supinator muscle
Supination of forearm at radioulnar joints.