The Brachial Plexus Explained
The Brachial Plexus
Structure of the Human Body
Major components--Robert Taylor drinks cold beer
Key branches of axillary artery
Details on branches from the roots, trunks, and cords
branches by using the interactive images
What is the Brachial Plexus?
ROBERT TAYLOR DRINKS COLD BEER (axillary nerve not included in drawing)
Major branches of the axillary artery
Computer enhanced radiographic image of the axillary artery
BRANCHES ORIGINATING FROM THE ROOTS
BRANCHES ORIGINATING FROM THE TRUNKS
BRANCHES OF THE LATERAL CORD
BRANCHES FROM THE MEDIAL CORD
BRANCH FORMED BY THE UNION OF THE LATERAL AND MEDIAL CORDS
Union of lateral and medial heads of the median nerve to form the MEDIAL NERVE
Branches formed by the posterior cord
Major injuries of the brachial plexus and terminal branches
Images of injuries
More images of nerve lesions; Note that the true ulnar claw as seen in the first and second pictures is caused by a distal ulnar lesion which paralyzes the medial two lumbricals and may cause thenar wasting due to loss of adductor pollicis. The "pope's blessing" or "Benedictine" sign looks the same but is only visible upon an active attempt to make a fist. It is due to a median nerve injury which paralyzes the lateral 2 lumbricals and weakens the flexor digitorum superficialis and deep. A total claw is visible in the infant's hand and is a result of Klumpke's palsy--damage to the lower roots affects the ulnar, median, and radial nerves--affecting all lumbricals and weakening extension of the digits.A sudden jerking of a child's arm or falling from a tree and grabbing a limb can cause it. Erb's palsy is a result of upper root damage and affects the suprascapular, musculocutaneous, and axillary nerves. The deltoid, brachialis, biceps, supraspinatus, and infraspinatus muscles may be affected contributing to the "waiter's tip" sign. Dystocia can cause both Klumpke's and Erb's palsies.
Nice pictures of various parts of the brachial plexus (dissected and photographed by Lauren Fetty)
A dermatome is a sensory band served by one dorsal root. Named cutaneous nerves may come from several dorsal roots and innervate a larger patch of skin.
Good mnemonic for remembering root contribution to marmu (musculocutaneous, axillary, radial, median, and ulnar nerves)
Three musketeers assassinated 5 rats, 5 mice, and 2 unicorns
Link to Lumen Learn'em brachial plexus.
Robert Taylor went home------The end