19.9 Flashcards
What is a segmental reflex?
In at one level and out at SAME level.
What is an inter-segmental reflex?
Occurs at different levels c.f. segmental reflex.
Lumbar puncture is usually performed at the level of ___/___.
L3/L4
There is ___ white matter as you move down the spinal cord.
Less - less axons all the way down.
Medial motor neurons in the spinal cord supply ___ muscles.
Proximal muscles.
Lateral motor neurons in the spinal cord supply ___ muscles e.g. of digits.
Distal muscles.
A motor pool is:
ALL motor neurons that innervate a specific muscle.
1 motor neuron supplies ___ muscle fibres, but 1 fibre is suppled by only ___ neuron.
1 motor neuron to multiple muscle fibres.
But 1 muscle fibre is innervated by only 1 neuron.
A motor unit is:
The muscle fibres controlled by 1 motor neuron!
Muscles only contract, therefore coordinate movement is performed by ____
Antagonism
The monosynaptic stretch reflex activates the ___ ___ (stretch receptors in muscle).
Muscle spindles.
___ ___ are the ONLY sensory organ that connects monosynaptically to motor neurons.
Muscle spindles.
The monosynaptic reflex maintains ___ and ___
Posture and stability
The muscle spindle and Golgi tendon organ pathways are examples of ___ spinal reflexes
Segmental
Inter-segmental reflexes include ___ (cross-extensor) and ___-___ complex reflex actions.
Bilateral (cross extensor) reflex.
Multi-segmental complex reflex actions.
