Module 7 Flashcards
(20 cards)
This neural circuit spreads information from one neuron to several, or from one pool to several pools.
Divergent
The ventral root of a spinal nerve contains:
axons of motor neurons
The outward projections from the central gray matter of the spinal cord toward the outer surface of the cord are called:
horns
The reflex that causes relaxation and prevents a muscle from exerting too much tension is the ________ reflex.
golgi tendon
In an adult, the conus medullaris is found at about
L1
What is the correct order of meninges from superficial to deep?
Dura mater, arachnoid mater, pia mater
What is the correct order of meninges from deep to superficial?
Pia mater, arachnoid mater, Dura mater
In this neural circuit several neurons synapse on a single postsynaptic neuron.
convergence
The white matter of the spinal cord is mainly:
myelinated axons
The dorsal root ganglia mainly contain
cell bodies of sensory neurons
Which of the following is TRUE about spinal cord structure?
Gray matter inside, white mater outside of the dorsal root.
In a withdrawal reflex, a painful stimulus causes flexor muscles to contract while inhibitory interneurons cause extensor muscles in the same limb to relax
reciprocal inhibition
In which direction(s) do action potentials propagate in spinal nerves?
both towards and away from the root
The receptor in the patellar reflex is the ____________, and it causes the muscle to _____________:
muscle spindle, contract
In which direction(s) do action potentials propagate in ventral nerve roots?
away from the cord
You step on a sharp tack and a reflex occurs which causes you to withdraw your foot from the tack and at the same time straighten your uninjured leg to support the transfer of weight. What do we call this response?
crossed extensor reflex
In which direction(s) do action potentials propagate in dorsal nerve roots?
towards the cord
Bill contracts a viral disease that destroys cells in the posterior gray horns in his spinal cord. As a result, which of the following would you expect?
loss of sensation in his torso
If the dorsal root of the spinal cord was severed
sensory input would be blocked
Your right arm is found on the ______________ side of the body when compared to the left leg.
Group of answer choices
colateral
