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In the spinal cord, white matter is separated into ascending and descending tracts organized as
The complex, interwoven network formed by contributions from the ventral rami neighboring spinal nerves is termed
The layer of connective tissue that surrounds individual axons within a peripheral nerve is termed the
Neurons in which dendritic and axonal processes are continuous and the soma lies off to one side are called
At the normal resting potential of a typical neuron, its Na-K ion exchange pump transports
sodium and potassium
Samples of the CSF for diagnostic purposes are normally obtained by placing the tip of a needle in the
subarachnoid space in the lumbar portion
The all-or-nothing principle states that
a given stimulus either triggers a typical action potential or none at all
Which of the following types of nerve fiber possesses the fastest speed of impulse propagation
When a second EPSP arrives at a single synapse before the effects of the first have disappeared, what occurs?
The _____ is a strand of fibrous tissue that provides longitudinal support as a component of the coccygeal ligament
Axons crossing from one side of the spinal cord to the other within the gray matter are found in the
Mary is in an automobile accident and suffers a spinal cord injury. She has lost feeling in the lower body. Her doctor tells her that swelling is compressing a portion of her spinal cord. Which part of her cord is likely to be compresses?
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?
The ventral rami form four major plexuses, including all of the following except the
1. cervical plexus 2. brachial plexus 3 lumbar plexus 4. sacral plexus
As the _______ nerve approaches the knee, it divides into two branches, the fibular nerve and the tibial nerve
The part of the peripheral nervous system that carries sensory information to the CNS is designated
afferent division of the PNS carries impulses inward to central organs, and the nerves that conduct impulses from periphery to brain/spinal cord
Functions of astrocytes include all of the following except
1. maintain blood/brain barrier 2 create 3D framework for CNS 3 repair damaged neural tissue
The following are the main steps in the generations of an action potential. The proper sequence of these event
1 depolarization of threshold 2 activation of Na channels and rapid depolarization 3 inactivation of Na and activation of K channels 4 closing of K channels
Which of the following is not a function of the neuroglia
1. separate and protect neurons, supportive framework for neural tissue, act as phagocyte, help regulate the composition of the interstitial fluid
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