Humeroulnar, Proximal Radioulnar Joints

Question 1

All muscles that act about the elbow flex and extend the joint originate either on the…

Answer 1

Humerus or Scapula

Question 2

The insertion point for all these muscles is either…

Answer 2

Radius or Ulna

Question 3

Biarticular muscles originate on the _____ and insert on either the ____ or ____.

Answer 3

Scapula
radius
ulna

Question 4

What muscle is considered a multiarticular muscle?

Answer 4

Biceps Brachii

Question 5

The elbow is designed for what?

Answer 5

Change the distance of the hand from the body.

Question 6

The forearm is designed to…

Answer 6

It pivot and rotate to change the orientation of the arm.

Question 7

The wrist is designed to do…

Answer 7

wrist flexion, extension, and deviation BUT does not rotate.

Question 8

Which epicondyle is larger? And where are they located?

Answer 8

Medial is larger

Located at distal end of humerus

Question 9

What are the important landmarks of the distal humerus?

Answer 9

1. Medial and lateral epicondyles
2. Trochlea-articulates with trochlear notch of ulna(forms humeroulnar jt)
3. Coronoid Fossa (accepts coronoid process of ulna during flexion)
4. Olecranon Fossa (accepts olecranon proces during flexion)
5. Capitulum (articulates with radial head)
6. Lateral & Medial Condyloid Ridge

Question 10

Important landmarks of the Proximal Ulna?

Answer 10

Coronoid Process
Trochlear Notch
Olecranon Process

Question 11

Important Landmarks on the Proximal Radius?

Answer 11

Radial Head

Radial Tuberosity

Question 12

What joint is the Humeroulnar joint?

Answer 12

Hinge joint (ginglymus)

Question 13

What joint is the Radioulnar joint?

Answer 13

Pivot joint (trochiod)

Question 14

Annular Ligament

Answer 14

Holds the radial head in place during pro/sup

Question 15

Movement of the _____ _____ is a _____ motion that allows the radius to rotate around the ulna thereby producing radioulnar/forearm _____ and _____.

Answer 15

radial head, pivot, pronation, subornation

Question 16

Name the flexors of the Elbow

Answer 16

Biceps Brachii
Brachialis
Brachioradialis

Question 17

Biceps Brachii Long Head

Answer 17

O: supraglenoid tubercle of scapula (tendon comes up through the inter tubercular grove/bicipital groove)
I: radial tuberosity
A: Flexion at shoulder/elbow, supination at radioulnar joint
WR - barbell arm curls, preacher curls, hammer curls

Question 18

Brachialis

Answer 18

Only true pure flexor of elbow & lies beneath the biceps brachii.
O: distal half of the anterior aspect humerus.
I: coronoid process of the ulna
A: flexion at elbow
WR - Best worked with spider curls & reverse barbell curls

Question 19

Biceps Brachii Short Head

Answer 19

O: coracoid process of scapula
I: radial tuberosity
A: Flexion at elbow & supination at radioulnar joint
WR - Barbell arm curls, preacher curls, hammer curls

Question 20

Flexion at the elbow is definitely more forceful when the forearm is fully…

Answer 20

Supinated

Question 21

Brachioradialis

Answer 21

O: lateral condyloid ridge
I: styloid process of the distal radius
A: flexion at elbow; pronation/supination to a neutral position (thumbs forward)
WR - Hammer Curls

Question 22

What are the extensors of the elbow

Answer 22

Triceps Brachii

Anconeus

Question 23

Triceps Brachii Long Head

Answer 23

O: infraglenoid tubercle
I: Olecranon process
A: Exension at the elbow and extension/hyperextension at the shoulder
WR - Push downs, supine dumbbell triceps extensions, close grip bench press

Question 24

Triceps Brachii Lateral Head

Answer 24

O: superior half of the posterior humerus
I: olecranon process
A: extension at the elbow
WR - Push downs, supine dumbbell triceps extensions, close grip bench press

Question 25

Anconeus

Answer 25

O: Posterior surface of the lateral condyle of the humerus I: olecranon process A - Extension at the elbow; ALSO, pulls the synovial membrane of the elbow joint out of the way of the advantage olecranon process as extension occurs. WR - Push downs, seated dumbbell triceps extension, close grip bench press

Question 26

Triceps Brachii Medial Head

Answer 26

O: Distal two thirds of the posterior humerus I: Olecranon process A: Extension at the elbow WR - Push downs, supine dumbbell triceps extension, close grip bench press

Question 27

Muscles that act about the proximal Radioulnar Joint

Answer 27

Supinator, Pronator Teres, & Pronator Quadratus

Question 28

Supinator

Answer 28

O: Posterior aspect of the lateral condyloid ridge & neighboring part of the Ulna I: Lateral side of the proximal third of the radius A: Supinate forearm/Radioulnar Joint

Question 29

Pronator Teres

Answer 29

O: Medial aspect of the medial condyloid ridge & medial proximal ulna I: Lateral aspect of the middle third of the Radius A: Pronate the forearm/Radioulnar Joint & Some flexion of the elbow

Question 30

Pronator Quadratus

Answer 30

O: Anterior surface of the distal fourth of the Ulna I: Anterior surface of the distal fourth of the Radius A: Pronation of the forearm/Radioulnar Joint(especially when the elbow is extended)