other radius and ulnar connections

what connects the radius and ulna that is not part of the elbow complex

distal radial joint and the interosseous membrane

distal radioulnar joint type

pivot synovial

distal radioulnar joint articulations

head of the ulna with the ulnar notch of the radius

triangular ligament

articular disc made of fibrocartilage

spans from the ulnar notch of the radius and moves medially to attach to the lateral aspect of the styloid process

reinforcing ligaments of the distal radioulnar joint

triangular ligament, anterior and posterior radioulnar ligaments

function of triangular ligament

binds ulna and radius together at the distal point

allows a fulcrum of motion to allow the pivoting motion to occur

anterior and posterior radioulnar ligaments

extrinsic ligaments help strengthen the fibrous layer of the joint capsule

distal radioulnar joint muscles

pronator quadratus- holds the bones together at the distal end

movement of the distal radioulnar joint

pronation- the distal radius moves anteriorly and medially crossing the bones

interosseous membrane joint type

syndesmosis fibrous amphiarthrotic joint

interosseous membrane articulations

shaft of the ulna with shaft of the radius

at what joints does pronation and supination occur

proximal radioulnar joint and distal radioulnar joint

prime movers of pronation

pronator teres and pronator quadratus

synergists of pronation

flexor carpi radialis

palmaris longus (if you have it)

brachioradialis

what nerve is knocked out if there is no pronation

median nerve

prime movers of supination and nerves

supinator - deepr radial nerve (C7,C8)

biceps brachii - musculocutaneous (C5,C6)

synergists of supination

extensor pollicis longus

extensor carpi radialis longus

why are there two nerves for supination

if one gets knocked out, supination can still occur because it is an important motion for feeding