Nerves of the Upper limb Flashcards
Note the 2 components of the nervous system
CNS
Peripheral
define afferent direction
Information encoded in nerve fibers is either transmitted into the CNS
define efferent direction
transmitted from the CNS to the periphery
define plexus
a braid, a coming together of more than one spinal nerve level of input
define dermatomes
Supply areas of skin and act to carry sensory information back to CNS from skin
define myotomes
A group of muscles that is innervated by the motor fibers that stem from a specific nerve root is called a myotome.
identify the 5 terminal branches
Axillary, Musculocutaneous, Radial , Medial , Ulnar
axillary nerve innervation
Teres minor, Deltoid Muscle - anterior
Musculocutaneousnerves innervation
Biceps, brachialis, coracobrachialis - anterior
radial nerves innervation
Triceps brachii, extensors of the forearm - Posterior
medial nerve innervation
PQ, PT, FDS and FPL, thenar muscles and Lateral 2 lumbricals - anterior
ulnar nerve innervation
FCU, FDP, hypothenar all interossei, adductor pollisicis 0 anterior and intrinsic muscles
axillary injury impact
deltoid and teres minor muscles will be affected, rendering the patient unable to abduct the affected limb beyond 15 degrees.
Musculocutaneousinjury impact
Flexor at the shoulder + elbow are weakened but still performed
Supination is weakened but still performed.
radial injury impact
unable to extend at the forearm, wrist and fingers
loss of sensation over the lateral and posterior arm, posterior forearm, and dorsal surface of the lateral three and a half digits
medial injury impact
impact the flexor muscles of the forearm and hand, as well as those muscles responsible for flexion, abduction, opposition, and extension of the thumb.
ulnar injury impact
damage at the elbow muscle paralysis may cause claw hand= Due to atrophy of the hypothenar compartment and interossei with resultant muscle imbalance
name the nerve
Ulna
name the nerve
medial
name the nerve
radial
name the nerve
musculocutaneous
name the nerve
axillary
Label the diagram below to show the sensory distribution of radial, ulnar, and
median nerves.
blue = medial
yellow = ulnar
red = radial
