Question 1

Which of the following best describes the function of the spinal cord in relation to the brain?

Accepted Answer

The spinal cord can process sensory input and generate motor output without input from the brain, especially through spinal reflexes.

Question 2

A patient presents with loss of sensation and motor function in the lower limbs. Imaging reveals damage at the level of the conus medullaris. Which anatomical feature is most likely affected?

Accepted Answer

The cauda equina, which consists of extended roots of spinal nerves below L1-L2.

Question 3

Which meningeal layer is directly anchored to the neural tissue of the spinal cord and contains a meshwork of elastic and collagen fibers?

Accepted Answer

Pia mater

Question 4

During a lumbar puncture, which space is the needle inserted into to withdraw cerebrospinal fluid (CSF)?

Accepted Answer

Subarachnoid space

Question 5

Which of the following best describes the organization of gray and white matter in a cross-section of the spinal cord?

Accepted Answer

White matter is superficial and gray matter is deep, forming an H or butterfly shape.

Question 6

Which of the following is TRUE regarding the naming of spinal nerves?

Accepted Answer

C1 spinal nerve emerges above the first cervical vertebra, while T1 emerges below the first thoracic vertebra.

Question 7

A patient with polio loses the use of his leg muscles. Which region of the spinal cord is most likely affected?

Accepted Answer

Anterior gray horn

Question 8

Which of the following best describes a dermatome?

Accepted Answer

A specific bilateral area of skin supplied by a pair of spinal nerves.

Question 9

Which nerve of the cervical plexus is essential for breathing, and damage to it would interfere with the ability to breathe?

Accepted Answer

Phrenic nerve

Question 10

Which of the following is a major nerve of the brachial plexus that innervates the upper limb?

Accepted Answer

Musculocutaneous nerve

Question 11

Which neural circuit pattern allows information to be spread from one neuron to several neurons or pools, enabling broad distribution of input?

Accepted Answer

Divergence

Question 12

Which of the following is the correct sequence of steps in a simple reflex arc?

Accepted Answer

Stimulation of a receptor → Activation of a sensory neuron → Information processing in the CNS → Activation of a motor neuron → Response of a peripheral effector

Question 13

Which type of reflex is characterized by a single synapse between a sensory neuron and a motor neuron, resulting in a rapid response?

Accepted Answer

Monosynaptic reflex

Question 14

Which of the following best describes the function of the muscle spindle in the stretch reflex?

Accepted Answer

It is the sensory receptor that detects changes in muscle length and triggers the reflex.

Question 15

During a withdrawal reflex, what happens to the limb on the side opposite the stimulus, and what is this response called?

Accepted Answer

It extends to support the body; this is called the crossed extensor reflex.

Question 16

Which of the following is a property of polysynaptic reflexes?

Accepted Answer

They involve pools of interneurons, reciprocal inhibition, and can activate muscle groups in multiple areas.

Question 17

A positive Babinski reflex in an adult most likely indicates:

Accepted Answer

Damage to descending motor pathways in the central nervous system.

Question 18

Which equation best represents the relationship between the number of synapses in a reflex arc and the speed of the response?

Accepted Answer

$$ t_{response} \propto n_{synapses} $$

Question 19

Which of the following best explains why the Jendrassik maneuver increases the patellar reflex response?

Accepted Answer

It facilitates the reflex by increasing excitability of motor neurons through reinforcement.

The Spinal Cord, Spinal Nerves, and Spinal Reflexes: Structured Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards