Lecture 9 9/5/23 Flashcards
What are the components of a reflex arc?
-sensory receptor
-sensory neuron
-synapse (can be multiple)
-motor neuron
-target organ/muscle
Where does the sensory neuron enter the spinal cord?
dorsal root
Where does the motor neuron exit the spinal cord?
ventral root
What is the role of the sensory receptor?
translate stimulus into action potential
What is the role of the sensory neuron?
carry action potential from sensory receptor to CNS
What does the number of synapses in the CNS depend on?
the number of neurons involved
What is the role of the motor neuron?
carry action potential from CNS to effector organ
What is the role of the effector organ/muscle?
undergo muscle contraction
Why is the patellar reflex important?
it helps an animal to maintain a normal gait
How is the patellar reflex tested?
-a hammer is used to hit the patellar tendon and stretch the muscle
-a “kick” signifies the reflex is present
Why is the withdrawal reflex important?
it signifies an animal’s ability to feel pain and withdraw limb from uncomfortable situations
How is the withdrawal reflex tested?
-toe is pinched on the skin
-flexing leg indicates presence of reflex
Which nerve acts in the patellar reflex?
femoral nerve
Which nerve acts in the withdrawal reflex?
sciatic nerve
Why is the pupillary light reflex important?
it allows for an animal to constrict the pupil and protect its eyes in conditions of bright light
