Peripheral Nervous System and reflex activity Flashcards
Segmentation in the embryo gives rise to segmentation in the adult. Name 2 examples of segmentation in the adult body.
the vertebral column, spinal nerves, and deratomes are all examples of segmentation in the adult
What is the role of the stretch reflex? The flexor reflex?
The stretch reflex is important for maintaining muscle tone and adjusting it reflexively by causing muscle contraction in response to increased muscle length (strecth). It maintains posture. The flexor or withdrawal reflex is initiated by a painful stimulus and causes automatic withdrawal of the painful body part from the stimulus. it is protective.
Name the 5 components of a reflex arc.
The five components of a reflex arc are receptor, sensory neuron, integration center, motor neuron and effector.
Which parts of the nervous system ultimately plan and coordinate complex motor activities?
The cerebellum and basal nuclei, which form the precommand level of motor control, plan and coordinate complex motor activities.
What are varicosities and where would you find them?
Varicosities are the series of knoblike swellings that are the axon endings of automatic motor neurons. You would find them on axon endings serving smooth muscle or glands.
