3.1 Flashcards
Spinal cord function
Integration of reflexes
Meninges
Dura
Pia
Arachnoid
Gray matter
Neural cell bodies
White matter
Tracts (axons)
“Elevator”
Gracile fasciculus
Carries sensations of trunk position and movement, deep touch, visceral pain, and vibration
Below T6
Cuneate fasciculus
Carries sensations of movement, deep touch, visceral pain, and vibration
Above T6
Spinothamalic
Light touch, itch, temperature, pain, and pressure
Spinoreticular
Sensations of pain from injury
Spinocerebellar
Carries information on muscle position (proprioception)
Upper motor neuron
Originates in the brain
Lower motor neuron
Inner area muscle as part of NMJ synapse at grey horns
Corticospinal
Fine control of limbs
Tectospinal
Reflexive head movement
Reticulospinal
Balance and posture, regulation of awareness of pain
Vestibulospinal
Lateral: balance and posture
Medial: control of head position
Spinal nerves
Carry sensory input and motor output
Dermatomes
Region of skin inner aged by spinal nerves
Can be used to locate spinal damage
Somatic reflexes properties
Require stimulation
Rapid
Involuntary
Non-variable
Reflex arc steps
Stimulus Sensory neuron activation Integration by interneuron Motor neuron activation Effectors response
Proprioreceptors
Give info about muscle position
Intrafusal fibers
Afferent neurons monitor rate of change (primary) and length (secondary)
Alpha
Extrafusal fivers
Gamma
Intrafusal
Stretch reflex
As a muscle is stretched, tone increases
Maintains posture and balance and stabilizes movements
Can involve multiple neurons, or as little as two
