Human Physiology

Erb’s Paralysis (The region of the upper trunk of brachial plexus is called Erb’s Point.)

What is Erb’s Point ?

The region of the upper trunk of brachial plexus is called Erb’s Point.

Six nerves meet here : –

1.C5 Root

2.C6 Root

3.Suprascapular Nerve

4.Nerve to Subclavius

5.Anterior Division

6.Posterior Division

Introduction

Erb’s paralysis is caused due to injury of Upper trunk where Erb’s point is located.

Injury is caused due to Undue separation of head from the shoulder.

1.At the time of Birth

2.Fall on shoulder

3.During Anaesthesia

Muscles Paralysed

Mainly – 1.Biceps

2.Deltoid

3.Brachialis

4.Brachioradialis

Partially

1.Supraspinatus

2.Infraspinatus

3.Supinator

Deformity

Arm : Hangs by the side, it is adducted and medially rotated.

Forearm : Extended and pronated. The deformity is known as Police Man’s Tip Hand Or Porter’s Tip Hand.

Nerve roots involved are – Mainly C5 and partly C6

Disability

The Following movements are lost :-

1.Abduction and lateral rotation of arm(Shoulder)

2.Flexion and supination of forarm.

3.Biceps and supinator jerks are lost.

4.Sensations are lost over a small area over the lower part of deltoid.