Chapter 14: Spinal Nerves Flashcards
how many pairs of spinal nerves
31
how many cervical nerve pairs
8
how many thoracic nerve pairs
12
how many lumbar nerve pairs
5
how many sacral nerve pairs
5
how many coccygeal nerve pairs
1
these are formed by merging two nerve roots together
spinal nerves
this contains motor axons from the ventral and lateral horn
ventral root
these contain sensory axons that enter into the dorsal horn
dorsal root
sensory is located in
dorsal root
motor is located in
ventral root
these contain cell bodies of the sensory neurons
dorsal root ganglia
define mixed nerve
contains motor and sensory axons
where do spinal nerves flow out
intervertebral foramen between adjacent vertebraes
The spinal nerves split into two
rami
what are the two rami of the spinal nerves
dorsal rami and ventral rami
what does the dorsal rami do
hold the motor and sensory nerves for the posterior trunk and back
what does the ventral rami do
hold motor and sensory information for the anterior and lateral trunk and extremities
these carry autonomic impulses to and from ganglion
rami communicants
these are bundles of axon fascicles with connective tissue covering
peripheral nerves
this connective tissue covers the individual axon
endoneurium
this connective tissue covers the fasicles of the nerve
perineurium
this connective tissue covers the whole nerve
epineurium
define plexus
ventral rami in the cervical, lumbar, and sacral spinal nerves that connect to make a network
define the intercostal nerves
connection of ventral rami of thoracic spinal nerves
this is where axons from a ventral rami will split and join with axons from other adjacent ventral rami
plexus
what are plexus named for
their general region and their pathway
name the four plexuses
cervical, brachial, lumbar, and sacral
name the nerve in the cervical plexus
phrenic nerve
the nerves of the cervial plexus
C1-C4
where does the cervical plexus supply nerves to?
skin and muscles of neck
the nerves of the phrenic nerve
C3-C5 (help you stay alive)
these motor nerves of the phrenic nerve innervate at the
diaphram
what spinal n erves make the brachial plexus
C5-T1
where do the brachial plexus supply nerves to?
skin and muscles of upper extremities
name some nerves of the brachial plexus
musculocutaneous nerve, median, ulnar, axillary, and radial nerve
the motor nerves of the musculocutaneous nerve influence what part of the body
anterior upper arm
the sensory nerves of the musculocutaneous nerve influence what part of the body
lateral forearm
the motor nerves of the medial nerve influence what part of the body
anterior forearm and anterior and lateral hand
the sensory nerves of the medial nerve influence what part of the body
the anterior and lateral hand
the motor nerves of the ulnar nerve influence what part of the body
anterior forearm and anterior hand
the sensory nerves of the ulnar nerve influence what part of the body
medial, posterior, and anterior hand
the motor nerves of the axillary nerve influences what part of the body
deltoid and teres minor
the sensory nerves of the axillary nerve influence what part of the body
shoulder
the motor nerves of the radial nerve influece what part of the body
posterior arm, posterior forearm, posterior hand
the sensory nerves of the radial nerve influence what part of the body
posterior arm, posterior forearm, posterior and lateral hand
where is the lumbar plexus
L1-L4
the lumbar plexus supplies nerves to what area of the body
pelvic girdle and lower extremities
name two nerves of the lumbar plexus
femoral nerve and obturator nerve
the motor nerve of the femoral nerve influences what part of the body
anterior hip and thigh
the sensory nerves of the femoral nerve influence what area of the body
anterior thigh, medial lower leg, medial foot
the motor nerves of the obturator nerve influence what area of the body
medial thigh
the sensory nerves of the obturator nerve influence what area of teh body
medial thigh
what nerves for the spinal nerves
L4-S4
the sacral plexus supplies muscles to what part of the body
muscles and skin of lower extremities
the sciatic nerve split into what other nerves
tibial and common fibular
the common fibular nerve splits into what two nerves
superficial and deep fibular nerve
The sciatic Nerve is specifically just ______ functions of the ______
motor of posterior thigh
the motor nerves of the tibial nerve influence this part of the body
posterior lower leg
the sensory nerves of the tibial nerve influence this part of the body
posterior lower leg and plantar surface
the motor nerves of the superficial fibular nerves influence what part of the body
lateral lower leg
the sensory nerves of the superficial fibular nerve influence what part of the body
lateral lower leg
the motor nerves of the deep fibular nerve influence this part of the body
anterior lower leg
the sensory nerves of the deep fibular nerve influence this part of the body
anterior lower leg and dorsal surface of the foot
what is the pathway of nerve impulses that produce reflexes
reflex arc
name the parts of the reflex arc
sensory receptor, sensory neuron, inegrating center, motor neuron, and effector
what is the effector
response to impulse
what is the motor neuron
carrys the impulse from the CNS to affector
what is the sensory neuron
carrys the impulse from the receptor to CNS
what responds to stimuli in the reflex arc
sensory receptor
