Humeroulnar, Proximal Radioulnar Joints Flashcards
All muscles that act about the elbow flex and extend the joint originate either on the…
Humerus or Scapula
The insertion point for all these muscles is either…
Radius or Ulna
Biarticular muscles originate on the _____ and insert on either the ____ or ____.
Scapula
radius
ulna
What muscle is considered a multiarticular muscle?
Biceps Brachii
The elbow is designed for what?
Change the distance of the hand from the body.
The forearm is designed to…
It pivot and rotate to change the orientation of the arm.
The wrist is designed to do…
wrist flexion, extension, and deviation BUT does not rotate.
Which epicondyle is larger? And where are they located?
Medial is larger
Located at distal end of humerus
What are the important landmarks of the distal humerus?
- Medial and lateral epicondyles
- Trochlea-articulates with trochlear notch of ulna(forms humeroulnar jt)
- Coronoid Fossa (accepts coronoid process of ulna during flexion)
- Olecranon Fossa (accepts olecranon proces during flexion)
- Capitulum (articulates with radial head)
- Lateral & Medial Condyloid Ridge
Important landmarks of the Proximal Ulna?
Coronoid Process
Trochlear Notch
Olecranon Process
Important Landmarks on the Proximal Radius?
Radial Head
Radial Tuberosity
What joint is the Humeroulnar joint?
Hinge joint (ginglymus)
What joint is the Radioulnar joint?
Pivot joint (trochiod)
Annular Ligament
Holds the radial head in place during pro/sup
Movement of the _____ _____ is a _____ motion that allows the radius to rotate around the ulna thereby producing radioulnar/forearm _____ and _____.
radial head, pivot, pronation, subornation
Name the flexors of the Elbow
Biceps Brachii
Brachialis
Brachioradialis
Biceps Brachii Long Head
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
Brachialis
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
Biceps Brachii Short Head
O: coracoid process of scapula
I: radial tuberosity
A: Flexion at elbow & supination at radioulnar joint
WR - Barbell arm curls, preacher curls, hammer curls
Flexion at the elbow is definitely more forceful when the forearm is fully…
Supinated
Brachioradialis
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
What are the extensors of the elbow
Triceps Brachii
Anconeus
Triceps Brachii Long Head
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
Triceps Brachii Lateral Head
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
Anconeus
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
Triceps Brachii Medial Head
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
Muscles that act about the proximal Radioulnar Joint
Supinator, Pronator Teres, & Pronator Quadratus
Supinator
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
Pronator Teres
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
Pronator Quadratus
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)
