Ascending & Descending CNS Tracts

A lesion in the spinothalamic pathway at the level of the left medulla would be most likely to cause deficits in pain and temperature sensation in which of the following parts of the body:

• Left Arm

• Right Leg

• Left Ear

• Right Forehead

Which of the following statements is FALSE regarding the motor reflexes?

• There are 3 types of reflexes: stretch (myotatic), tendon (inverse-myotatic), and flexor (withdrawal).

• The stretch and tendon reflexes work in opposition to one another.

• The stretch reflex causes monosynaptic excitation of the homonymous motor neuron, causing inhibition of the antagonist muscle.

• The flexor reflex causes polysynaptic excitation of extensors and inhibition of flexors, causing opposite effects contralaterally.

The part of the nervous system that transmit impulses from the CNS to skeletal muscle is the

• somatic motor nervous system

• autonomic nervous system

• central nervous system

• afferent division

Clusters of nerve cell bodies within the PNS are called

• nuclei

• nodes of ranvier

• myelin sheaths

• ganglia

To produce an action potential in a neuron

• depolarization must occur

• the threshold level of membrane potential must be reached

• the cell membrane must become permeable to sodium ions

• all of the above

Neurotransmitters are released in a synapse and bind to

• presynaptic terminals

• the synaptic cleft

• the base of the axon

• receptors on the postsynaptic terminal

Important centers for control of heart rate, blood vessel diameter, breathing, swallowing and coughing are located in the

• cerebrum

• cerebellum

• medulla oblongata

• basal nuclei

Tags

NGSS.HS-LS1-3

Our conscious state is maintained by activity generated in the

• cerebellum

• reticular formation

• limbic system

• medulla oblongata

The major relay station for action potentials going to and from the cerebral cortex is the

• hypothalamus

• pineal body

• pons

• cerebellum

• thalamus

General sensory input, such as pain, touch, and temperature are carried to the

• primary motor area

• association areas

• primary somatic sensory area

• prefrontal area