UL Concept E Flashcards
Name the 5 segments of brachial plexus from proximal to distal
Roots Trunks Divisions Cords Terminal branches
Which vertebral nerves do brachial plexus stem from?
C5-T1
C5, C6, C7, C8, T1
What are terminal branches?
*Named nerves traveling to and from upper limb structures
Which trunk is from C5+C6?
Superior trunk
Which trunk is from C8+T1?
Inferior trunk
Which trunk is a continuation of C7?
Middle trunk
What muscles do the axillary nerve innervate?
Deltoid
Teres minor
If axillary nerve is damaged, what is the result?
Decreased ability to abduct the arm
Overall weakness in shoulder movement
Cutaneous innervation of axillary nerve is?
Superolateral arm superficial to deltoid muscle
What is the origin of axillary nerve?
Posterior cord
What is the path of axillary nerve?
Passes posterior to surgical neck of humerus
What does radial nerve innervate?
All posterior compartments of arm and forearm
Cutaneous innervation of radial nerve?
Areas of posterior arm, posterior forearm, posterior hand & lateral 3.5 digits (except distal tips)
What is the origin of radial nerve?
Posterior cord
Path of radial nerve?
Passes posterior to the humerus within radial groove
Injury of radial nerve causes?
Decreased ability to perform extension at elbow wrist and digits
Musculocutaneous nerve innervates?
ALL anterior arm
Musculocutaneous nerve innervates all of the anterior arm, but it’s cutaneous innervation is to…
The lateral forearm
What is the origin of musculocutaneous nerve?
Lateral cord
What is the path of musculocutaneous nerve?
Pierces coracobrachialis muscle
Courses deep to biceps brachii muscle
Damage to musculocutaneous m. causes?
Decreased ability to flex at elbow and supinate at elbow
Median nerve innervates anterior forearm. But what does it NOT innervate?
Flexor carpi ulnaris
Medial 1/2 of flexor digitorum profundus m.
Medial nerve innervates anterior forearm (except FCU & 1/2 FDP) AND what muscles of the hand?
Thenar (moves thumb)
What does median nerve cutaneously innervate?
Lateral 3.5 digits and associated palm
Posterior tips of same fingers
Origin of median nerve?
Lateral and medial cords
What is the path of median nerve?
Passes through cuboidal fossa
Passes through carpal tunnel at wrist
Injury of median nerve?
Carpal tunnel syndrome
Weakness in hand grip & opposition of thumb
Abnormal sensation in lateral 3.5 digits
