Nervous System General Concepts Flashcards
The CNS is usually described as consisting of what structures?
- Cerebral hemisphere consisting of the cerebrum and diencephalon,
- the Brain stem consisting of the midbrain, pons and medulla,
- the Cerebellum
- the Spinal cord.
Peripheral Nervous System (PNS) consists of what and where is it located?
Spinal and Cranial Nerves
PNS located outside the skull and vertebral column
where are Spinal nerves are derived from?
spinal cord segments
What cranial nerves are derived from the brain stem? what nerve is derived from the upper spinal cord? Key Concept!!!
while cranial nerve III to X and XII
3,10,12
CN XI (11)
what cranial nerves are associated with the cerebral hemisphere?
Cranial nerves I and II
how many pairs of spinal nerves?
31 pair of spinal nerves
-8 cervical nerves, 12 thoracic nerves, 5, lumbar, 5 sacral, 1 coccygeal
how many pairs of cranial nerves?
12 pair of cranial nerves
A collection of nerve cell bodies (or in some cases, a single nerve cell body) located outside the CNS
Ganglia
Autonomic (motor) ganglia are associated with both
spinal and cranial nerves.
Sensory nerve fibers have their CELL BODIES located where? KEY CONCEPT
in dorsal/posterior root ganglia located outside the CNS.
- Cranial nerves do not have a dorsal or ventral root
CN I CN II CN III CN IV CN V CN VI CN VII CN VIII CN IX CN X CN XI CN XII
CN I Olfactory CN II Optic CN III Oculomotor CN IV Trochlear CN V Trigeminal CN VI Abducens CN VII Facial CN VIII Vestibulocochlear CN IX Glossopharyngeal CN X Vagus CN XI Accessory CN XII Hypoglossa
Sensory ganglion nerve cell bodies associated with cranial and spinal nerves are located WHERE?
IN sensory ganglia outside of the CNS
Autonomic (motor) nerve cell bodies are located in ?
motor or visceral ganglia found outside the CNS
Which of the following ganglia contain sensory nerve cell bodies?
A. Autonomic ganglia
B. Cranial nerve ganglia
*C. Cranial nerve and dorsal root ganglia
D. Dorsal root ganglia
E. Dorsal root and parasympathetic ganglia
F. Dorsal root and sympathetic ganglia
where are multipolar neurons located most?
at higher levels in the CNS or
in the ventral or anterior horn (interneurons)
what does the Lateral Horn contain and where is it found?
Contains the preganglionic cell bodies (multipolar neurons) of the autonomic nervous system (ANS)
Found only in the thoracic and upper lumbar spinal cord segments
What does the Motor horn of the ventral horn contain?
Alpha motor neurons (lower motor neurons)\
Gamma Motor Neurons
what does the alpha motor neuron innervate?
what does the Gamma Motor neurons innervate?
extrafusal skeletal muscle fibers/cells.
the intrafusal muscle fibers/cells of the neuromuscular spindle
the “H” of the spinal cord is made up of what matter?
White Matter
Dorsal column or funiculus contains?
Contains mainly ascending nerve cell processes (axons) whose cell bodies are located in dorsal root ganglia.
Lateral AND ventral column or funiculus contains?
Ascending sensory nerve fibers (tracts) and descending motor nerve fibers (tracts)
Lateral AND ventral column or funiculus contains?Sensory nerve fibers (tracts) have their cells of origin in ?
the gray matter of the dorsal horn
