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KIN 3350 Lecture 8 Elbow/Forearm I
Kinetic Anatomy
36
Anatomy
Undergraduate 4
10/03/2016

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Cards

Term
The elbow complex consist of what 2 items?
Definition
Elbow joint (hinge) and the radioulnar joint (pivot)
Term
What are the 3 bones of the elbow complex?
Definition
Humerus, ulna, radius
Term
Name the 4 joints comprising the elbow complex.
Definition
Radiohumeral joint, ulnohumeral joint, proximal radioulnar joint, distal radioulnar joint.
Term
At the radiohumeral joint, where does the surface where head of radius rotates during forearm flexion/extension?
Definition
Capitulum.
Term
At the radiohumeral joint, which part of the humerus accepts head of radius?
Definition
the Radial fossa
Term
At the radiohumeral joint, where is the attachment for biceps, just below radial neck?
Definition
Radial tuberosity
Term
At the ulnohumeral joint, which part of the ulna does humerus articulate?
Definition
Trochlea notch
Term
At the ulnohumeral joint, which part of the humerus accepts the coronoid process of ulna?
Definition
Coronoid fossa
Term
At the ulnohumeral joint, which part of the humerus accepts olecranon process of ulna?
Definition
Olecranon fossa.
Term
At the radioulnar joint, because it's a pivot joint, which bone moves around which bone?
Definition
Radius moves around ulna
Term
At radioulnar joint, proximal end, the head of radius moves at where?
Definition
radio notch of ulna
Term

At radioulnar joint, distal end, ulnar moves at which part of the radius?

 

Definition
Ulnar notch of radius
Term
Interosseous membrane is a ligmentous band of connective tissue spanning radisus and ulna gap. what are it's 4 functions?
Definition
Distributes pressure between the two bones. Shock absorber, place for muscular attachment, prevents radius-ulna seperation.
Term
What is the 2 functions of the capsular ligament of the elbow?
Definition
Surrounds all 3 articulations at elbow and laterally fuses with the collateral ligament.
Term
What are the 3 distinct parts of teh collateral ligaments?
Definition
Anterior band, posterior band, transverse or oblique band.
Term
the ulnar or medial collateral ligament spans which joint?
Definition
ulnohumeral joint
Term
What is the function of the transverse or oblique band of the collateral ligament?
Definition
Stablize against valgus stress.
Term
What is the function of the oblique cord of the radius and ulna?
Definition
To assists interosseous membrane to prevent ulna-radial separation.
Term
Which tendon is harvested for ulnar collateral ligament reconstruction?
Definition
contralateral or ipsilateral forearm (i.e. palmaris longis), patella tendon, or cadeveric tendon graft.
Term
What type of surgery is the most significant developments in orthopedic and sports medicine for overhand athletes?
Definition
Ulnar collateral liament reconstruction.
Term
What are 2 special test for collateral ligament stability?
Definition
the elbow valgus and varus stress test.
Term
What are 2 positive test for the elbow valgus stress test?
Definition

-Gaping on medial aspect.

-Indicates sprained medial collateral ligaments and possible joint instability.

Term

What are 2 positive test for the elbow varus stress test?

 

Definition

"Gaping" on lateral aspect

Indicates sprained lateral collateral ligaments and possible joint instability.

Term
Of the elbow joint, which ligament connects inferior border of lateral epicondyle to the annular ligament?
Definition
Radial or lateral collateral ligament
Term
What is the function of annular ligament of the elbow joint?
Definition
Holds head of radius in the radial notch of the ulna.
Term
At the elbow joint, which ligament connects lateral epicondyle to ulna?
Definition
Lateral ulnar collateral ligament
Term
What is the function of the lateral ulnar collateral ligament?
Definition
Stabilize against varus stress
Term
At the elbow joint, what is the muscles responsible for flexion?
Definition
Biceps brachii, brachialis, brachioradialis
Term
Biceps brachii: Origin, Insertion, Action, Reversed origin-insertion action, nerve?
Definition

Origin: Long Head-supraglenoid tubercle through labrum, short heard - coracoid process

Insertion: Radial tuberosity and bicipital aponeurosis

Action: Flexes and supinates forearm at the elbow.

Reversed origin-insertion action: Both heads flex arm at shoulder

Nerve: Musculotaneous

Term

Brachialis: Origin, Insertion, Action, Reversed origin-insertion action, nerve?

 

 

Definition

Origin: Middle anterior shaft of humerus

Insertion: Ulnar tuberosity and coronoid process of ulna

Action: Flexion of elbow

Nerve: Musculotaneous (Additional branch from radial nerve)

Term
Brachioradialis: Origin, Insertion, Action, nerve?
Definition

Origin: Proximal lateral supracondylar ridge of humerus

Insertion: Radial syloid process

Action: Elbow flexor, pronates and supinates to mid-position

Nerve: Radial

 

Term
At the elbow joint, what are the muscles responsible for extension.
Definition
Triceps brachii, anconeus
Term

Triceps brachii: Origin, Insertion, Action, nerve?

 

Definition

Origin: Long head-infraglenoid tubercle, lateral head-proximal 1/3 of posterolateral aspect of humerus, medial head-distal 2/3 posterolateral humerus

Insertion: Olecranon process of ulna

Action: All heads extend elbow. Long Head extends, horizontally abducts, and adducts shoulder

Nerve: Radial

Term
Anconeus: Origin, Insertion, Action, nerve?
Definition

Origin: Posterior lateral epicondyle.

Insertion: Lateral olecranon process

Action: Extension

Nerve: Radial

Term
At the radioulnar joing, which muscles is responsible for supination?
Definition
Bicep brachii, supinator, brachioradialis (to neutral)
Term
At the radioulnar joint, which muscles is responsible for pronation?
Definition
Pronator teres, pronator quadratus, brachioradialis (to neutral)
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