Brachial Plexus Flashcards
What nerve roots contribute to the axillary nerve?
C5, C6
What nerve roots contribute to the musculocutaneous nerve?
C5, C6, C7
What nerve roots contribute to the radial nerve?
C5, C6, C7, C8
What nerve roots contribute to the median nerve?
C6, C7, C8, T1
What nerve roots contribute to the ulnar nerve?
C8, T1
In an axillary nerve lesion, where is sensation altered?
Lateral arm
In a musculocutaneous nerve lesion, where is sensation altered?
Lateral forearm
In a radial nerve lesion, where is sensation altered?
Dorsum of hand over first dorsal interosseous and anatomic snuffbox.
In a median nerve lesion, where is sensation altered?
Lateral 3.5 digits, lateral palm
In an ulnar nerve lesion, where is sensation altered?
Medial 1.5 digits, medial palm
In an axillary nerve lesion, where is motor weakness present?
Abduction at shoulder
In a musculocutaneous nerve lesion, where is motor weakness present?
Flexion of forearm, supination
In a radial nerve lesion, where is motor weakness present?
Wrist extension, metacarpophalangeal extension, supination.
In a median nerve lesion, where is motor weakness present?
Wrist flexion, finger flexion, pronation, thumb opposition.
In an ulnar nerve lesion, where is motor weakness present?
Wrist flexion, finger spreading, thumb adduction, finger extension.
What is a common sign of a radial nerve lesion?
Wrist drop
What is a common sign of a median nerve lesion?
Ape hand, hand of benediction, ulnar deviation at wrist
What is a common sign of an ulnar nerve lesion?
Claw hand, radial deviation at wrist
What are common causes of an axillary nerve lesion?
Surgical neck fracture of humerus; dislocated humerus
What are common causes of a musculocutaneous nerve lesion?
Rarely lesioned
What are common causes of a radial nerve lesion?
Saturday night palsy, midshaft fracture of the humerus, subluxation of the radius, dislocated humerus
What are common causes of a median nerve lesion?
Carpal tunnel compression, supracondylar fracture of the humerus, pronator teres syndrome
What are common causes of an ulnar nerve lesion?
Fracture of medial epicondyle of humerus, fracture of hook of the hamate, fracture of clavicle
