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Brachial Plexus Anatomy

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Questions and Answers

Which nerve originates from the upper trunk of the brachial plexus?

Dorsal scapular nerve

Long thoracic nerve

Suprascapular nerve

Nerve to subclavius (correct)

What is the site of the posterior group of axillary lymph nodes?

At the apex of the axilla along the medial side of axillary vein

On the posterior wall in front of the subscapularis muscle (correct)

On the lateral wall along the axillary vein

On the anterior wall along the lower border of the pectoralis minor

Which nerve is a branch of the lateral cord of the brachial plexus?

Upper subscapular nerve

Lateral pectoral nerve (correct)

Medial cutaneous nerve of the forearm

Radial nerve

What is the function of the long thoracic nerve?

Innervates the serratus anterior muscle Signup and view all the answers

Which of the following nerves is a branch of the posterior cord of the brachial plexus?

Thoracodorsal nerve Signup and view all the answers

What is the apical group of axillary lymph nodes located?

At the apex of the axilla along the medial side of axillary vein Signup and view all the answers

What is the direction of the apex of the Axilla?

Upwards towards the root of the neck Signup and view all the answers

What muscle originates from the outer surface of the upper 8 ribs?

Serratus anterior Signup and view all the answers

What is the function of the lower 5 digitations of the Serratus anterior muscle?

Abduction of the arm above 90° Signup and view all the answers

What is the nerve supply of the Serratus anterior muscle?

Long thoracic nerve Signup and view all the answers

What is the composition of the lower trunk of the brachial plexus?

The union of the 8th cervical and the 1st thoracic root Signup and view all the answers

How many divisions do each of the trunks of the brachial plexus divide into?

2 Signup and view all the answers

What is the name of the canal bounded by the posterior surface of the clavicle, superior border of the scapula, and outer border of the 1st rib?

Cervicoaxillary canal Signup and view all the answers

What is the result of paralysis of the Serratus anterior muscle?

Winged scapula Signup and view all the answers

What is the derivative of the posterior cord of the brachial plexus?

The union of the posterior division of the upper, middle, and lower trunks Signup and view all the answers

What is the location of the roots of the brachial plexus?

In the neck Signup and view all the answers

What is the number of cervical nerves that contribute to the formation of the brachial plexus?

5 Signup and view all the answers