Lab 1- Nervous Tissue Flashcards
Cell body
Constitues nucleus and cytoplasm.
Nucleus
DNA-containning structure of cell body.
Axon hillock
Conic area of origin of axon.
Dendrite
Branching extensions of cell body providing structural pathway for afferent info.
Axon
Structural pathway for efferent info.
Neurolemmocyte (Schwann cell) and Myelin Sheath
Cell that surround and myelinated axons in PNS.
-Myelin: insulates and rapid transmission of impulses.
Nodes of Ranvier (neurofibril nodes)
Gap in myelin sheath allows formation of new AP, increases rate of impulse transmission.
Telodendria
Distal branching of neural axon.
Axon terminals = synaptic end bulbs
Axon terminates, communicates with subsequent cells.
neurotransmitters
What is another word for sensory neuron?
Afferent
What is another word for motor neuron?
Efferent
What type of neuron is between sensory and motor neurons?
Interneurons (association neurons)
Epineurium
Covering of entire nerve.
Perineurium
surrounds group of nerve fibers forming a fascicle.
Endoneurium
Wrapping of each nerve fiber.
Fascicle
Small bundle of nerve fibers.
Axon
long & single nerve-cell process.
Myelin sheath
Fatty white substance surrounding axon.
Tract
Collections of axons in CNS.
Nerve
Collections of axons in PNS.
Ganglia
Collections of neuron cell bodies in PNS.
Nucleus/nuclei
Collections of neuron cell bodies in CNS.
Cerebrospinal fluid (CSF) is found in the subarachnoid space, which is between the ________ and ________.
Arachnoid mater & Pia mater.
The epidural space is between ________ and ______.
Vertebra & Dura mater.
Ventral root
(anterior root)
Efferent = motor
Dorsal root
(posterior root)
Afferent = sensory
Dorsal root ganglion
(posterior root ganglion)
swelling of lateral SC containing sensory neuron cell bodies.
Spinal nerve
Merging of ventral and dorsal roots. (mixed nerve)
Does the dorsal root contain sensory or motor neurons?
Sensory
Does the ventral root contain sensory or motor neurons?
Motor
What is in the dorsal root ganglion?
collection of cell bodies in PNS.
What is gray matter composed of?
cell bodies & unmyelinated axons.
In which two spinal cord regions are the lateral gray horns present?
Thoracic & Lumbar.
What do the ascending tracts of the white columns convey?
Sensory info.
What do the descending tracts of white columns convey?
Motor info.
Name 2 diseases that cause destruction of the anterior horn motor neurons.
- Polio
- ALS