ANAT30007 Lecture Notes - Lecture 14: Thenar Eminence, Ulnar Nerve, Axillary Nerve
20 May 2018
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Lumbricals take origin from FDP tendons, share nerve supply of tendon they arise from -
medial two lumbricals supplied by ulnar nerve, lateral two supplied by median nerve
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Supplies all muscles in anterior forearm except FCU and medial part of FDP; supplies thenar
muscles (of thenar eminence - sometimes shared with ulnar nerve)
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Cutaneous distribution: lateral 3.5 fingers + adjacent palm, nail beds, variable dorsal fingers
(never dorsum of hand)
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Palmar (cutaneous) branch goes over flexor retinaculum, supplies skin of palm (not affected in
carpal tunnel syndrome)
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Branches of posterior cord, radial and axillary nerves, exit axilla through posterior wall
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Axillary nerve exits above teres major, radial nerve exits below it
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Radial Nerve in Arm and Nerves of Posterior Shoulder
Locomotor Page 7
Emerges through axilla wall below subscapularis/shoulder joint, above teres major, below
teres minor (vulnerable in antero-inferior dislocation of shoulder joint)
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Supplies teres minor, deltoid
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Cutaneous distribution: skin over deltoid
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Axillary nerve (C5,6)
Branch of posterior cord with contribution from all ventral rami
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Emerges beneath teres major, spirals in humeral groove with profunda brachii artery
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Supplies triceps, 13 posterior forearm muscles
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Gives branches off early/before structure it supplies - fracture of shaft of humerus at spiral
groove damages radial nerve, often triceps is spared
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In the forearm it gives off all motor fibres in the deep branch that goes through supinator
(supplies all muscles of extensor compartment), becoming the posterior interosseous nerve
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Passes anterior to lateral epicondyle, deep to brachioradialis, descends lateral forearm with
radial artery
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Radial nerve (C5-T1)
Locomotor Page 8
Document Summary
Supplies all muscles in anterior forearm except fcu and medial part of fdp; supplies thenar muscles (of thenar eminence - sometimes shared with ulnar nerve) Lumbricals take origin from fdp tendons, share nerve supply of tendon they arise from - medial two lumbricals supplied by ulnar nerve, lateral two supplied by median nerve. Cutaneous distribution: lateral 3. 5 fingers + adjacent palm, nail beds, variable dorsal fingers (never dorsum of hand) Palmar (cutaneous) branch goes over flexor retinaculum, supplies skin of palm (not affected in carpal tunnel syndrome) Radial nerve in arm and nerves of posterior shoulder. Branches of posterior cord, radial and axillary nerves, exit axilla through posterior wall. Axillary nerve exits above teres major, radial nerve exits below it. Emerges through axilla wall below subscapularis/shoulder joint, above teres major, below teres minor (vulnerable in antero-inferior dislocation of shoulder joint) Branch of posterior cord with contribution from all ventral rami.
