The Elbow and Radioulnar Joints Anatomy and Physiology of Human Movement 420:050

The Elbow and Radioulnar Joints Usually grouped together due to close anatomical relationship Elbow joint movements may be clearly distinguished from those of the radioulnar joints Often grouped together due to proximity Entirely different Structurally = 2, functionally = 1 Elbow joint distal attachment: Ulna Radioulnar joint distal attachment: Radius

Objectives Bones, bony landmarks and joints Muscles Movements

The Elbow and Radioulnar Joints Elbow Joint Diarthrodial uniaxial hinge joint Plane? Axis? Movements? Articulation? Bony Stops?

Radioulnar Joint Radioulnar Joint Diarthrodial uniaxial pivot joint From Seeley RR, Stephens TD, Tate P: Anatomy & physiology, ed 7, New York, 2006, McGraw-Hill; Shier D, Butler J, Lewis R: hole’s human anatomy & physiology, ed 9, New York, 2002, McGraw-Hill. Radioulnar Joint Diarthrodial uniaxial pivot joint Plane? Axis? Movements? Articulations?

Objectives Bones, bony landmarks and joint Muscles Movements

Biceps Brachii

Brachialis

Brachioradialis

Triceps Brachii

Anconeus

Pronator Teres

Pronator Quadratus

Supinator

Objectives Bones, bony landmarks and joint Muscles Movements

Movements Flexion: Extension: Movement of forearm to shoulder by bending the elbow to decrease its angle Extension Extension: Movement of forearm away from shoulder by straightening the elbow to increase its angle

Movements Pronation Supination Internal rotary movement of radius on ulna that results in hand moving from palm-up to palm-down position Supination External rotary movement of radius on ulna that results in hand moving from palm-down to palm-up position

FLEXION Superior movement of the forearm in the sagittal plane

FLEXION

FLEXION Biceps brachii Brachialis Brachioradialis Pronator teres

EXTENSION Inferior movement of the foremarm in the sagittal plane

EXTENSION

EXTENSION Triceps Long head also extends the shoulder Anconeus

PRONATION Internal rotary movement of the palm to the down position

Pronator Quadratus

PRONATION Supinated position

PRONATION Brachioradialis Pronator teres Pronator quadratus

SUPINATION External rotary movement of the palm to the up position

Supinator

SUPINATION Supinated position

SUPINATION Pronated position

SUPINATION Biceps brachii Brachioradialis Supinator