Spinal Nerves Lecture
segments of skin innervated by a single spinal nerve are called _____
dermatomes
roots are organized by _____
function
rami are organized by _____
location
spinal nerves are _____ than cranial nerves
longer
the anterior rami of L1-L4 spinal nerves are part of the _____ _____
lumbar plexus
the femoral nerve is part of the _____ _____
lumbar plexus
the obturator nerve is part of the _____ _____
lumbar plexus
the radial nerve is motor to
posterior arm and forearm
the radial nerve is sensory to
posterior arm, forearm, hand
the tibial nerve is sensory to
posterior leg and sole of foot
the tibial nerve is motor to
posterior thigh and leg and sole of foot
the ulnar nerve is motor to
medial half of flexor digitorum profundus, flexor carpi ulnaris, hypothenar, lumbricals 4 and 5, and interossei
the ulnar nerve is sensory to
medial hand
the obturator nerve is motor to
medial thigh
the obturator nerve is sensory to
medial thigh
an anterior root contains axons from _____ neurons
motor
the brachial plexus nerves include MARMU which stand for
musculocutaneous, axillary, radial, median, ulnar
spinal nerves split into two main branches called _____
rami
the anterior primary ramus innervates everything from the _____ _____
neck inferiorly
a structure you see with the naked eye is called a _____
nerve
a network of converging or diverging axons is a _____ _____
nerve plexus
the anterior primary ramus forms _____ _____
nerve plexuses
axons wrapped in connective tissue layers are called _____
nerves
each spinal nerve is formed from an anterior and posterior _____
root
the anterior rami of L4-S4 spinal nerves are part of the _____ _____
sacral plexus
the common fibular nerve is part of the _____ _____
sacral plexus
the sciatic nerve is part of the _____ _____
sacral plexus
the tibial nerve is part of the _____ _____
sacral plexus
the _____ _____ splits into the tibial nerve and common fibular nerve
sciatic nerve
a posterior root contains axons from _____ neurons
sensory
in the posterior root ganglion there are cell bodies of _____ neurons
sensory
dermatomes create a _____ _____ of the body
sensory map
all brachial plexus nerves have both _____ and _____ components
sensory, motor
each nerve in the lumbar plexus has both _____ and _____ components
sensory, motor
each nerve in the sacral plexus has both _____ and _____ components
sensory, motor
chickenpox virus latent in posterior root ganglia that reactivates along dermatome is called _____
shingles
the cervical plexus sensory innervates the
skin of neck, ear, and shoulders
posterior primary ramus are _____ than anterior primary ramus
smaller
a spinal nerve comes directly off the _____ _____
spinal cord
when an anterior and posterior root unite, they form a _____ _____
spinal nerve
the femoral nerve is sensory to
anterior and inferomedial thigh and medial leg and foot
the common fibular nerve is motor to
anterior and lateral leg and dorsum of foot
the common fibular nerve is sensory to
anterior and lateral leg and dorsum of foot
the median nerve is motor to
anterior forearm, thenar, and lumbricals 2 and 3
the cervical plexus motor innervates the
anterior neck
nerve plexuses are usually formed from _____ _____ _____
anterior primary rami
the femoral nerve is motor to
anterior thigh
the posterior primary ramus innervates deep _____ muscles and _____ of _____
back, skin, back
the anterior rami of C5-T1 spinal nerves are the _____ _____
brachial plexus
anterior rami of C1-C4 spinal nerves is the _____ _____
cervical plexus
the phrenic nerve is part of the _____ _____
cervical plexus
the musculocutaneous nerve is motor to
coracobrachialis, biceps brachii, and brachialis
the axillary nerve is motor to
deltoid and teres minor
there are _____ lumbar spinal nerves
5
there are _____ sacral spinal nerves
5
there are _____ coccygeal spinal nerves
1
there are _____ thoracic spinal nerves
12
there are _____ pairs of spinal nerves
31
there are _____ cervical spinal nerves
8
the phrenic nerve controls
C3, C4, C5
spinal nerves are part of the _____
PNS
the sacral plexus innervates the
butt, pelvic structures, and lower limb
the phrenic nerve supplies the
diaphragm
C3, C4, C5 keeps the _____ _____
diaphragm alive
the lumbar plexus innervates the
inferior abdominal wall and lower limb
the musculocutaneous nerve is sensory to
lateral forearm
the median nerve is sensory to
lateral palm of hand
the axillary nerve is sensory to
lateral shoulder
the brachial plexus primarily innervates the
upper limb