Brachial Plexus Flashcards
Lateral Cord gives off which nerves?
Lateral pectoral nerve
Musculocutaneous nerve
Lateral head of median nerve
Ulnar nerve (lateral head SOMETIMES)
Posterior cord gives off which nerves?
Upper subscapular Lower subscapular thoracodorsal Radial Axillary
The medial cord gives off which nerves?
Medial pectoral Medial brachial cutaneous Medial antebrachial cutaneous Ulnar Medial head of median nerve
The musculocutaneous nerve innervates which muscles?
Muscles of the anterior compartment (pre-axial muscles) of the arm and then becomes cutaneous to receive sensory input from the lateral part of the antebrachium
The lateral head of the median nerve innervates what?
Nothing in the arm, but instead innervates muscles in the forearm/hand.
The radial nerve innervates what?
muscles of the posterior compartments (post-axial muscles) of the arm and forearm. receives sensory input from these regions as well as the dorsolateral surface of the hand.
Axillary Nerve innervates what?
innervates the deltoid and teres minor muscles. it also receives sensory input from the deltoid region of the arm.
The ulnar nerve innervates what?
Nothing in the arm, instead passes through to gain access to forearm and/or hand
The medial head of median nerve innervates what?
Nothing in the arm instead passes through to innervate the forearm and/or hand
Describe Erb-Duchenne paralysis
Birth injury due to excessive pulling or traction of the arm during delivery
Results in stretching or tearing of the upper trunk
How does Erb-Duchenne paralysis present?
arm medially rotated, shoulder adducted, elbow extended, and forearm pronated.
What nerves are involved in Erb-Duchenne paralysis?
axillary, dorsal scapular, subscapular, long thoracic, and musculocutaneous
Why would someone with Erb-Duchenne paralysis lose shoulder roundness?
Atrophy of deltoid
Why would someone with Erb-Duchenne paralysis have winging in their scapula?
due to paralysis of rhomboids and serratus anterior, because of damage to dorsal scapular and long thoracic nerves respectively
People with Erb-Duchenne paralysis lose abduction and partial loss of ______ due to the paralysis of ______
Lateral rotation
Teres Major
