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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 |