DFO Set Four Flashcards
Nerve fibres of the spinothalamic tract are:
Sensory
The semicircular canals are in _______ planes of the body
Three
The part of the brain that receives impulses from the labyrinth of the ear, and thus functions in the maintenance of equilibrium, is the:
Cerebellum
The spinothalamic tract carries the sensation of pain and:
Temperature
The corticospinal tract is concerned with:
Controlling trunk and limb movements
Which is true of a reflex arc?
It always consists of an afferent neuron, an efferent neuron, and an interneuron
Axons from the anterior gray horn of the spinal cord terminate in:
Skeletal muscle
Which sequence best represents the course of an impulse over a reflex arc?
Receptor, sensory neuron, interneuron, motor neuron, effector
Somatic reflexes consist of:
Contractions of skeletal muscles
Which of the following is true about spinal nerves?
They are motor and sensory fibres
What two factors of action potential delivery from lower motor neurons determines the strength of muscle contraction?
Frequency - How many times a motor unit activates within a period of time
Recruitment (total number of motor units activated at a given time)
Why are motor reflexes considered involuntary movements?
Because they are independent of the brain
What are the three parts of the motor cortex and describe how they work together to produce a motor signal that will cause movement?
Basal ganglia
Brainstem
Cerebellum
Which of the following is not true of the knee jerk reflex?
It is not a flexor reflex
Aside from the motor cortex, what other parts of the brain are involved in the control of motor movements and how do they contribute to that control?
Prefrontal cortex - anticipates actions and decides movements
Premotor cortex - plans movements
Primary motor cortex - Initiates movements by sending action potentials along neurons to skeletal muscles
