05 Neurons and Spinal Cord Flashcards
What are the arrows pointing to on the motor neuron?
Synaptic input terminals on dendrites
Around all axons and thier sheaths is a connective tissue layer called ____.
How does it act?
Endoneurium.
Acts as a electrical insulator.
Neurons are ____ ____ cells and are supported by ____ cells.
electrically conductive; glial cells
signals called ___ ___ travel like rolling waves down the lenths of neurons from one end of the cell to the other.
action potentials
In an action potential, Na+ goes ___ and K- ___ the cell.
Na+ ions go into the cell
K- ions leave the cell.
An action potential stops when it reaches a ___ ____ causing ____ to be released.
chemical synapse; neurotransmitter
What are the three neuron types?
Sensory Neuron
Interneuron
Motor Neuron
Which neuron type directly receives the stimulation/input?
Sensory
Which Neuron type is non-motor, and non-sensory?
Interneuron
Which neuron type diectly stimulates a muscle cell or gland?
Motor Neuron
Where is the conducting zone?
Axon
Where is the output zone?
Axon terminals
Where is the input zone?
Typically dendrite tips.
What are the numbered parts of the chemical synapse?
- Neurotransmitter
- Neurotransmitter Receptors
- The synapse
Action potentials can run more than one way in the axon? T or F
False. AP’s can only run one way.
A nerve is a bundle of ____
axons
Name the three types of CT sheaths
- Endoneurium
- Perineurium
- Epineurium
Pia mater, arachnoid mater and dura mater make up the ___.
Meninges
Spinal nerves from C1 - C7 are named for the vertebra ___ them
below
Where is spinal nerve C8 located? Becuase of C8 the nerves remainig are named for the vertebra ___ them.
between C7 and T1
above
Label parts 1-5
- Sensory Nerve
- Dorsal sensory ganglion
- Spinal nerve
- White mater
- Gray mater
Label the parts of the meninges
- Arachnoid mater
- Dura mater
- Pia mater
Label 1 - 3
- Dural sensory ganglion
- spinal nerve
- sympathetic chain gland
Name the 4 plexuses
- cervical
- brachial
- lumbar
- sacral
What wraps their myelin sheaths around the axon?
Schwan cells
Ions cannot get through the sheath - they can only make action potentials at gaps between sheaths called ____ __ ____.
Nodes of Renvier
what is the name of the special synapse between a motor neuron axon terminal and a skeletal muscle cell?
Neuromuscular junction
What is shown in the slide
motor neurons
Identify F, En, P and E in the slide
F - Fasicle
En - Endoneurium
P - Perineurium
E - Epineurium
Identify the arrowed features of the slide
Axon
Myelin sheath
Node of Ranvier
Identify the regions shown
- White mater
- Gray mater
Identify the parts of the spinal cord and meninges
- Dura mater
- Arachnoid mater
- Cerebral spinal fluid
- Pia mater
What are the structures shown?
Sensory dendrites / input terminals
