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Questions and Answers
Which nerve originates from the posterior cord and supplies teres minor and posterior deltoid?
Through which space does the axillary nerve pass posteriorly at the lower border of subscapularis?
Which nerve descends from the lower border of pectoralis minor, lateral to the axillary artery?
Which nerve penetrates the medial intermuscular septum and enters the posterior compartment to continue descent anterior to the medial head of triceps?
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Which nerve divides into anterior and posterior branches after passing around the surgical neck of humerus?
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Which nerve originates from the medial cord and passes anterior to the triceps as far as the insertion of coracobrachialis?
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Through which space does the musculocutaneous nerve pass after piercing coracobrachialis and descending diagonally between biceps and brachialis?
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Which nerve supplies the teres minor and posterior deltoid after dividing into anterior and posterior branches?
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Which nerve descends laterally posterior to the axillary artery and anterior to the subscapularis, passing posteriorly at the lower border of subscapularis, before dividing into anterior and posterior branches?
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Which nerve penetrates the deep fascia lateral to flexor carpi ulnaris and proximal to flexor retinaculum before passing anterior to flexor retinaculum and lateral to pisiform?
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Through which space does the median nerve pass as it descends between the two heads of pronator teres?
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Which nerve passes through the carpal tunnel before dividing into medial and lateral branches?
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Which nerve descends obliquely towards the lateral humerus along the spiral groove?
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Which nerve enters the anterior compartment via the lateral intermuscular septum to lie between brachialis and brachioradialis?
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Which nerve ends in a flattened expansion on the interosseous membrane after descending between deep and superficial groups of extensors?
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Study Notes
Axillary Nerve
- Originates from the posterior cord of the brachial plexus.
- Supplies teres minor and posterior deltoid muscles.
- Passes through the surgical neck of the humerus, dividing into anterior and posterior branches.
Musculocutaneous Nerve
- Descends from the lower border of pectoralis minor, lateral to the axillary artery.
- Pierces coracobrachialis and descends diagonally between biceps and brachialis.
- Enters the anterior compartment via the lateral intermuscular septum, positioned between brachialis and brachioradialis.
Median Nerve
- Passes through the carpal tunnel and divides into medial and lateral branches.
- Descends between the two heads of pronator teres, navigating through the space formed by muscle.
Radial Nerve
- Descends obliquely towards the lateral humerus along the spiral groove.
- Ends in a flattened expansion on the interosseous membrane after traversing between deep and superficial groups of extensors.
Ulnar Nerve
- Penetrates the deep fascia lateral to flexor carpi ulnaris, proximal to flexor retinaculum.
- Passes anterior to the flexor retinaculum and lateral to the pisiform bone.
Summary of Key Nerves
- The axillary nerve is essential for shoulder function, innervating key muscles.
- Musculocutaneous nerve plays a vital role in elbow flexion and forearm sensation.
- Median nerve involvement is crucial for wrist and hand function.
- Radial nerve is important for arm and forearm extension.
- Ulnar nerve is key for hand grip and fine motor skills.
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Description
Test your knowledge of the origin, course, and branches of the axillary nerve as it relates to the shoulder anatomy and function.
