NERVES Flashcards
Mixed nerves
Motor and sensory nerves
Motor nerves
axons with only motor neurons
sensory nerves
axons with only sensory neurons
how many spinal nerves?
31 pairs
almost all are mixed
how many cranial nerves?
12 pairs
Spinal nerve
Anterior root
Posterior root
Posterior root ganglion
Spinal nerve
Sensory info
Travels into spinal cord POSTERIOR root
Motor info
travels out from spinal cord ANTERIOR root
Posterior horn
interneurons and sensory nerves
Lateral horn
autonomic motor neurons
Nerve plexuses
Brachial
Lumbar
Sacral
plexus
intertwine to create a network of nerves
Bracial Plexus
Radial nerve
Median nerve
Ulnar nerve
Ulnar nerve
Motor:
hand muscles, a few finger flexors
Sensory:
skin on 1/2 of hand
temperature, pain, touch sensations start there then travel ulnar nerve to spinal cord and then to brain
Median nerve
Motor:
forearm. pronation, wrist flexors, finger flexors, thumb movers
Sensory:
some of the hand. mainly fingers