48 Questions
What is the expected response when the patellar ligament is struck?
Contraction of the quadricep muscle
In the Polysynaptic Reflex, which structure is not directly involved?
Muscle
What is the main characteristic of a reflex?
Is an automatic reaction that does not involve conscious thought
What occurs when the skin between the toes is pinched?
Flexion of the joints
What type of muscles are involved in the Withdrawal Reflex?
Flexor muscles
What happens if too much force is used to elicit a withdrawal reflex?
Testing for pain
Which type of motor neuron originates in the grey matter of the spinal cord and connects directly to the muscle?
LMN
What is a characteristic of LMN damage?
Permanent in most cases
Which spinal functional segment has LMN to the rear legs?
L4-S3
What does the Menace Response involve?
Blinking in response to a harmful object
Which cranial nerves are involved in the Pupillary Light Reflex?
CN II and CN III
What is assessed in the Panniculus Reflex?
Dorsal touch response
What is the primary function of a reflex arc?
To produce an involuntary response to a stimulus
Which of the following is NOT a component of a typical reflex arc?
Cerebral cortex
What distinguishes a monosynaptic reflex from a polysynaptic reflex?
A monosynaptic reflex involves a single synaptic connection, while a polysynaptic reflex involves multiple synaptic connections
The patellar reflex, also known as the knee-jerk reflex, is an example of a:
Monosynaptic reflex
Which of the following is NOT a step in the monosynaptic reflex arc for the patellar reflex?
Interneuron relays the signal to the motor neuron
What is the primary difference between a response and a reflex?
A response involves the cerebral cortex, while a reflex does not
Which of the following reflexes is monosynaptic?
Patellar reflex
In the reflex arc shown, the neuron labeled #5 is a:
Motor somatic neuron
Which spinal cord segment would an injury affect the lower motor neurons innervating the front limb?
C6 - T2
Which reflex is mediated by the trigeminal (CN V) and facial (CN VII) nerves?
Palpebral reflex
Which nerve innervates the cutaneous trunci muscle, causing it to twitch in response to a stimulus to the trunk?
Lateral thoracic nerve
Which reflex is mediated by the pudendal nerve, with roots from spinal cord segments S1-S3?
Perineal reflex
Which component of the polysynaptic reflex arc is responsible for the inhibition of muscle contraction?
Interneuron in the spinal cord
What is the primary difference between a reflex and a response?
Reflexes are automatic reactions, while responses require conscious thought
What is the purpose of the withdrawal reflex?
To flex the joints of the pinched limb and coordinate the contraction of flexor muscles
What is the primary function of a reflex arc?
To provide an automatic, rapid response to a stimulus without conscious thought
What is the expected response when the patellar ligament is struck?
Contraction of the quadriceps muscle
What happens if too much force is used to elicit a withdrawal reflex?
The reflex will test for pain instead of the withdrawal response
What is the main difference between monosynaptic and polysynaptic reflexes?
Monosynaptic reflexes involve a single synapse, while polysynaptic reflexes involve multiple synapses.
Which of the following best describes the process of a monosynaptic reflex?
A stimulus causes a direct sensory neuron response without involving an interneuron.
What is the role of an interneuron in a reflex arc?
To connect sensory neurons to motor neurons within the spinal cord.
Which component is NOT part of a typical monosynaptic reflex arc?
Interneuron
What initiates a monosynaptic reflex like the patellar reflex?
Stretch on the tendon
Which term best describes a reflex that tests a very specific area and is rapid in nature?
Stretch reflex
What is a characteristic of UMN damage?
Exaggerated muscle tone
Which spinal cord segment has UMN innervating the front limbs?
Higher Cervical C1-C5
What type of reflex is the Pupillary Light Reflex?
Autonomic
Which type of motor neurons communicate directly with muscles in the peripheral nervous system?
Lower Motor Neurons (LMN)
What characteristic distinguishes the Menace Response from other reflexes?
Involves communication with the cerebrum
Which cranial nerve is involved in the Panniculus Reflex?
CN V (Trigeminal nerve)
Which reflex is mediated by the lateral thoracic nerve that supplies motor innervation to the cutaneous trunci muscle?
Cutaneous trunci reflex
Which of the following reflexes involves the orbicularis oculi muscle contracting in response to touching the eyelid?
Palpebral reflex
Which spinal cord segment would an injury affect the lower motor neurons that innervate the rear limbs?
L4 - S3
Which component of the reflex arc is represented by the arrow labeled #5 in the image?
Motor neuron
Which of the following reflexes is mediated by the pudendal nerve with roots from spinal cord segments S1-S3?
Perineal reflex
Which of the following reflexes is described as monosynaptic in the provided text?
Patellar reflex
Test your knowledge on reflexes in the context of a veterinary biology course with this quiz. Learn about reflex arcs, differentiate between types of reflexes, and understand the components involved in a reflex arc.
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