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NEURO
Anat-Lecture 2
Question | Answer |
---|---|
white matter | consists of myelinated and unmyelinated axons |
white matter | consists of three faniculi |
faniculi | small bundle of fibers, enclosed in a tubular sheath |
gray matter | consists of neuronal cell bodies, dendrites, and synapses = neuropil |
neuropil | unmyelinated neuronal processes (axonal and dendritic) within the gray matter of the central nervous system. |
white matter | arranged in tracts or fasciculi |
neuronal tract | group of axons that have similar origins and terminations |
gray matter | arranged in columns |
nucleus | group of nerve cell bodies located in the CNS that share similar functional properties |
T1 - L3 | lateral/intermediate horn is present in segments |
below L2 | take CSF |
when naming tracts | origin >> termination |
alar plate-- dorsal root axons grow | into it |
basal plate-- ventral root axons grow | out of it |
spinal nerve components | somatic sensory, somatic motor, visceral sensory, visceral motor |
nerves are named for their site of ________ | emergence from spinal canal |
dermatome | region of skin innervated by axons in one dorsal root |
dermatome | skin associated with each developing somite |
DTR bicep | C5-6, musculocutaneous |
DTR tricep | C7, radial |
DTR knee | L7, femoral n. |
DTR, ankle | S1, sciatic n. |
monosynaptic stretch reflex | reflexinvolves no intermediaries |
flexor reflex | reflex involves an interneuron |
crossed extensor reflex | reflex involves a commissural interneuron |
crossed extensor reflex | reflex involves the principle of reciprocal innervation |
ganglia | collection of verve cell bodies located outside the PNS |