Joints- Elbow Flashcards
What type of joint is the elbow joint?
Hinge
What makes up the elbow joint?
Trochlea and capitulum or the humerus, trochle notch of ulna and head of radius
What surrounds the elbow joint?
- Articular capsule = hyaline cartilage
- Fat pads
- Synovial bursae = sacs lined by synovial membrane, filled with synovial fluid
Movements at the elbow joint
Flexion and extension
What 3 smaller joints is the elbow joint made up of
Humeroulnar= between the trochlea of humerus and trochlear notch of ulna
Humeroradial= captulum of humerus and radial head
Radio-ulnar joint= proximal- located near the elbow. It is articulation between the head of the radius and the radial notch of the ulna.
distal- located near the wrist. It is an articulation between the ulnar notch of the radius and the ulnar head.
Ulnar collateral ligament
Extends from the medial epicondyle of the humerus to the coronoid process and olecranon of the ulna
- deepens the socket for the trochlea of the humerus
Radial collateral ligament
Extends from the lateral epicondyle of the humerus to the anular ligament of the radius and the radial notch of the ulna
Surrounding muscles: Brachialis
O= distal half of anterior surface of humerus
I= Coronoid process of the ulna; tuberosity of ulna
N= Musculocutaneous nerve (C5, C6) radial nerve (C7)
B= Brachial artery
A= Strong flexion of forearm at the elbow joint
Surrounding muscles: Biceps brachii (two heads)
O= short head: apex of coracoid process of the scapula
long head: supraglenoid tubercle of the scapula
I= radial tuberosity
N= musculocutaneous nerve (C5-C6)
B: Brachial artery
A= flexion and supination of forearm
Surrounding muscles: Brachioradialis
O= lateral supracondylar ridge of humerus
I= styloid process of radius
N= radial nerve (C5,C6)
B= radial artery
A= elbow joint: forearm flexion
Annular ligament
Reinforces the joint as it holds the ulna and radius together at proximal articulation.
- It surrounds the radial head and attaches onto the radial notch of ulna
