Brachial Plexus - Part 4 Flashcards
The inferior subscapular nerve contains fibers from what?
C5 and C6
The inferior subscapular nerve supplies what muscles?
Subscapularis (a rotator cuff)
Teres major
What are the two terminal branches coming off of the posterior cord?
axillary nerve
Radial nerve
The axillary nerve contains fibers from what?
C5 and C6
The axillary nerve travels in the axilla then travels _______ around the ___________ of the ______.
Posteriorly
Surgical neck
humerus
The axillary nerve supplies what two muscles?
Deltoid Teres minor ( a rotator cuff)
What sensory branch is given off of the axillary nerve at the same level that the branch to the teres minor is given off? (it then goes to deltoid)
Superior lateral cutaneous nerve of the arm
The superior lateral cutaneous nerve of the arm supplies what?
Skin over the lateral shoulder and upper arm
The radial nerve contains fibers from what?
C5-C8, and sometimes T1
The radial nerve supplies all the muscles in which compartment of the arm?
posterior
From the medial bicipital sulcus, the radial nerve spiral around to what?
Posterior of humerus
The radial nerve passes into the forearm on the _____ side of the _____ after traveling between what two muscles?
Anterior
Elbow
Brachialis and brachioradialis
In the forearm, the radial nerve divides into what?
Superficial and deep branch
The superficial branch of the radialis follows what muscle to the distal 3rd of the forearm?
brachioradialis
The superficial branch of the radialis travels between what to the posterior surface of the hand?
Brachioradialis and radius
The deep branch of the radial nerve penetrates what muscle?
supinator
The deep branch of the radial nerve gives off branches to supply what?
Posterior forearm muscles
The deep branch of the radial nerve terminates as what nerve?
Posterior interosseous nerve
What nerve off of the radial nerve branches off in the upper arm?
Posterior cutaneous nerve of the arm
The posterior cutaneous nerve of the arms supplies what?
Posterior side of upper arm
This nerve branches off the radial nerve in the middle arm?
Inferior lateral cutaneous nerve of the arm
The muscular branches of the radial nerve given off in the arm will supply what?
All three heads of the triceps brachii
anconeus
The posterior cutaneous nerve of the forearm is given off by the radial nerve where?
In the upper arm
The posterior cutaneous nerve of the forearm supplies what?
Narrow area of kin on the lateral side of the posterior forearm
Branches given off the radial nerve at the level of the epicondyle supply what muscles?
brachioradialis
Extension carpi radialis longus
The superficial branch of the radial nerve given off in the forearm travels to the hand and gives off what nerves?
Dorsal digital nerves
The dorsal digital nerves supply what?
Sensory to:
Radial side of the posterior hand
Extensor side of thumb
Extensor side of the proximal phalanges of digits 2 and 3
Lateral half of the extensor side of the ring finger
The superficial branch of the radial nerve also gives off the ___________ ulnar nerve
Communicating branch with the ulnar nerve
The deep branch of the radial nerve continues as what nerve?
Posterior interosseous nerve
The posterior interosseous nerve (off the deep branch of radial nerve) gives off branches to supply which muscles?
Extensor carpi radialis brevis supinator Extensor digitorum Extensor digiti Minami Extensor carpi ulnaris Abductor pollicis longus Extensor pollicis brevis and longus Extensor indicis
Does the posterior interosseous nerve (radial) supply intrinsic hand muscles?
NO
The radial nerve sends articular branches to what?
Shoulder and wrist joints
What reflexes test radial nerve?
Triceps and brachoiradialis
What can happen with a damaged radial nerve?
Wrist drop
What is wrist drop?
Unable to hold wrist in extension
What is a supraclavicular brachial plexus injury? An infraclavicular one?
Erb-Duchenne
Klumpke
What nerve roots are especially important in Erb-Duchenne?
C5 and C6
Which nerves are especially important in Klumpke (Dejerine -Klumpke’s)?
C8 and T1
Erb-Duchenne will atrophy which muscles?
Biceps brachii, brachialis, deltoid
What happens in Erb-Duchenne?
Traction of shoulder (shoulder pulled down)
What happens in Klumpke?
Traction (like falling and catch self in a tree)
What else may someone with Klumpke demonstrate? Why?
Horner’s syndrome (ptosis, mitosis - dry eye)
Because of T1
What is the MC cause of Erb-Duchenne and Klumpke’s?
Birth trauma
Both Erb-Duchenne and Klumpke’s are both types of what?
palsy
