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Nervous System 1
from nervous system 1 power point
32
Anatomy
Graduate
09/10/2011

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Cards

Term
What are multipolar neurons?
Definition
motor (efferent) nerves that convey neural impluses from the CNS to distant effector organs (muscles, glands)
Term
What are pseudouniplar neurons?
Definition
sensory (afferent) nerves that convey neural impulses from sensory receptors (in skin, muscles, eyes, ears, and organs) to the CNS
Term
structural divisions of nervous system
Definition
central and peripheral nervous systems
Term
functional divisions of nervous sytem
Definition
somatic (voluntary) and autonomic (involuntary) nervous systems
Term
describe gray matter in spinal cord
Definition
H shaped, has high density of nerve cell bodies
Term
How are the H regions of gray matter in the spinal cord subdivided?
Definition
dorsal horns and ventral horns
Term
what is the white matter in the spinal cord?
Definition
bundles of nerve axons (tracts)
Term
what does the PNS consist of?
Definition
ALL neural tissues outside of the CNS
Term
what is a ganglion?
Definition
collection of nerve cell bodies in the PNS
Term
what are peripheral nerves?
Definition
bundle of nerve axons in the PNS
Term
how are peripheral nerves classified?
Definition
as spinal nerves or cranial nerves
Term
how many pairs of spinal nerves are there and how are they divided?
Definition
31: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal
Term
what are rootlets?
Definition
little things that come out of spinal cord and converge to form roots
Term
spinal roots converge to form what?
Definition
spinal nerve
Term
spinal nerve divides to form what?
Definition
rami
Term
are spinal nerves peripheral or central nerves?
Definition
peripheral
Term
what do dorsal rami do?
Definition
convey nerve fibers to and from the intrinsic back muscles, the skin of the back, and the facet joints of the vertebral column
Term
what do ventral rami do?
Definition
convey nerve fibers to and from the anterior and lateral regions of the trunk/torso, the arms and legs
Term
peripheral nerves of the somatic nervous system carry which types of nerves?
Definition
somatic motor (GSE) and general sensory (GSA)
Term
what is the acronym for somatic motor nerves?
Definition
GSE
Term
what type of neurons are somatic motor nerves?
Definition
multipolar neurons
Term
what do somatic motor nerves (GSE) do?
Definition
convey impulses from the CNS to skeletal (voluntary) muscles
Term
what is the acronym for somatic motor nerves?
Definition
GSA
Term
what do general sensory nerves do?
Definition
convey sensations from the body to the CNS
Term
what sensations do general sensory nerves convey?
Definition
pain, temperature, touch, proprioception
Term
what type of neurons are general sensory nerves?
Definition
pseudounipolar neurons
Term
where do cell bodies of somatic motor nerves (GSE) reside?
Definition
ventral horn
Term
how do the axons of somatic motor nerves (GSE) exit the spinal cord?
Definition
via the ventral root to innervate skeletal muscle
Term
where do the axons of the general sensory nerves (GSAs) reside?
Definition
dorsal horn of the spinal cord
Term
how do the axons of the general sensory nerves (GSA) project into the dorsal horn?
Definition
through the dorsal root
Term
where do the cell bodies of the general sensory nerves reside?
Definition
dorsal root ganglion
Term
somatic nervous system does NOT provide sensory and motor innervation to which body parts?
Definition
viscera in the body cavities, smooth and cardiac muscle, glands
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