Brachial Plexus

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What is the lateral limit of the axillary inlet?

The anterior axillary skin fold

The upper part of the serratus anterior muscle

The tip of the coracoid process (correct)

The clavicle

What muscle forms the inferior margin of the posterior axillary wall?

Pectoralis major

Latissimus dorsi (correct)

Serratus anterior

Teres major

Which of the following is NOT a brachial plexus injury?

Carpal tunnel syndrome (correct)

Brachial plexus neuroma

Wrist drop

Brachial plexus root avulsion

What is the anatomical basis for wrist drop?

Injury to the radial nerve Signup and view all the answers

Which of the following is NOT a component of the brachial plexus?

Branches Signup and view all the answers

Which of the following is the best way to diagnose a brachial plexus injury?

All of the above Signup and view all the answers

Which nerve is responsible for innervating all muscles on the posterior and lateral sides of the upper limb?

Radial nerve Signup and view all the answers

Where does the brachial plexus begin?

In the neck Signup and view all the answers

What do the dorsal divisions of the trunks form?

Posterior cord Signup and view all the answers

Which trunk is a continuation of C7 in the brachial plexus?

Middle trunk Signup and view all the answers

What is the lateral boundary of the axilla?

Humerus Signup and view all the answers

Where do the ventral divisions recombine to form the lateral and medial cords?

Behind the axillary artery Signup and view all the answers

What is the characteristic posture resulting from an injury to the lower trunk or the 1st thoracic nerve?

Claw hand Signup and view all the answers

Which nerve injury is similar to an injury to the lower trunk or the 1st thoracic nerve in its effects on the hand?

Ulnar nerve injury Signup and view all the answers

What is the clinical manifestation of a posterior cord injury involving the radial nerve?

Wrist drop Signup and view all the answers

What is the condition referred to as 'Saturday night palsy' caused by?

Falling asleep or passing out with the arm draped over the back of a chair, applying weight to the axillary region Signup and view all the answers

Which of the following can cause a posterior cord injury?

Both A and B Signup and view all the answers

What type of sensory loss is associated with an injury to the lower trunk or the 1st thoracic nerve?

Loss of sensation over the medial side of the upper limb Signup and view all the answers

Which of the following muscles would be affected in an upper plexus injury (Erb's palsy)?

Infraspinatus and Teres minor Signup and view all the answers

What is the characteristic posture of the arm and forearm in an upper plexus injury (Erb's palsy)?

Arm rotated medially and forearm pronated Signup and view all the answers

Which of the following nerves would be affected in a lower plexus injury (Klumpke's paralysis)?

Ulnar nerve Signup and view all the answers

Which of the following statements is true regarding brachial plexus injuries?

Sensory loss and muscle weakness occur distal to the site of injury Signup and view all the answers

Which of the following is the most common cause of an upper plexus injury (Erb's palsy)?

Sudden forced separation of the head from the shoulder Signup and view all the answers

Which of the following is NOT a characteristic feature of a lower plexus injury (Klumpke's paralysis)?

Affects the flexor digitorum profundus and flexor pollicis longus muscles Signup and view all the answers