Exp. 18 Flashcards
The soma forms a cone shaped __________ as it projects to form an axon.
Axon hillock
Are small distal branches of an axon
Telodendria
Either schwann cells or extension of _________ can form myelin sheaths
Myelin
Gaps between segments pf a myelin sheath are called ?
Nodes of ranvier
A group of myelinated fibers may form a region of nerve tissue called ?
White matter
The _______ neuron connects an afferent neuron to an efferent neuron
Interneuron
A junction between two neurons or between a neuron and an effector is called ?
Synapse
Bundle of parallel neurons encased in fibrous connective tissue is called ? (In the PNS)
Nerve
Bundle of parallel neurons in the CNS is called ?
Tracts
A muscle or gland that is regulated by a nerve input is termed ?
Effector
An action potential traveling down a myelinated axon travels __________ (faster/slower) than in an unmyelinated axon
Faster
Unmyelinated nerve tissue is called ?
Gray matter
In infants, the ________ response is normal when testing the plantar reflex but abnormal in adults
Babinski response
When testing the plantar reflex to adults, extension of toes may indicate damage of the ________ somewhere along the reflex arc
Myelin
In the _______ reflex, a muscle contracts when the load increases
Stretch
The center of the patellar reflex is is the ?
Spinal cord
A stretch reflex involving the biceps brachii muscle causes ________ of the elbow if the biceps muscle is streched
Flexion
In the triceps reflex demonstration, the triceps muscle was the effector, and one or more ________ were the receptors
Stretch receptor
If the Achilles (calcaneal) tendon is tapped, one would expect rhe ankle to ______
Plantar reflex
When suddenly illuminated with penlight, the pupil of the eye normally _______
Constricts
Components of reflex arc in order in which nerve signals pass through them
Receptor Sensory neuron Association neuron Motor neuron Effector
2 major divisions of nervous system
CNS- includes the brain and spinal cord
PNS- includes all the nerves
Cell type that conducts impulses
Neurons or action potentials
Supports the neurons
Neuroglia
Neurons can be ?
Unipolar- one projectiln
Bipolar- two projections
Multipolar- many projections
Enlarged area filled with cytoplasm and containing nucleus
Soma
Soma forms a cone shaped projection called ?
Axon hillock
The axon may be wrapped w/ a series of neuroglial cells called ?
Schwann cells
Inner layers of shwann cells are filled with _______
Fatty white substance called myelin
Segmented sheath of schwann cells is called?
Myelin sheath
Gaps between shwann cells is called
Nodes of ranvier
Axon is called ?
White fiber or myelinated fiber
Group of white fibers together is called ?
White matter
Unmyelinated matter or?
Gray matter
Multipolar neurons have many projections from the soma called?
Dendrites- sensitive to stimuli
Bump on the dendrite is called ?
Gemmule
Mediated by a two neuron arc CENTERED in the spinal cord
Patellar reflex or knee jerk reflex
Damage or diseased motor neurons in the CNS
Hyperflexia or exaggerated response
Degeneration of nerve pathways and other factors
Hypoflexia or inhibited response
