Q: Which equation best represents the pathway of a polysynaptic reflex arc?

$$\text{Sensory receptor} \rightarrow \text{Sensory neuron} \rightarrow \text{Interneuron}_1 \rightarrow \text{Interneuron}_2 \rightarrow \text{Motor neuron} \rightarrow \text{Effector organ}$$

Question 1

Which structure anchors the spinal cord to the coccyx and helps stabilize its position within the vertebral column?

Accepted Answer

Filum terminale

Question 2

A patient receives an epidural injection for pain relief during childbirth. In which space is the anesthetic administered?

Accepted Answer

Epidural space

Question 3

Which of the following best describes the function of the Golgi tendon reflex?

Accepted Answer

It prevents excessive tension in tendons by causing muscle relaxation.

Question 4

What is the correct order of components in a typical reflex arc?

Accepted Answer

Sensory receptor → sensory neuron → interneuron → motor neuron → effector organ

Question 5

Which spinal cord region is responsible for supplying nerves to the lower limbs?

Accepted Answer

Lumbar enlargement

Question 6

A patient presents with loss of sensation in the skin over the lateral shoulder. Which nerve is most likely affected?

Accepted Answer

Axillary nerve

Question 7

Which of the following is TRUE about monosynaptic reflexes?

Accepted Answer

They do not involve interneurons.

Question 8

The dorsal root of a spinal nerve contains which type of fibers?

Accepted Answer

Sensory fibers

Question 9

Which nerve from the cervical plexus is essential for breathing because it innervates the diaphragm?

Accepted Answer

Phrenic nerve

Question 10

Which of the following best describes reciprocal innervation during a withdrawal reflex?

Accepted Answer

Flexor muscles contract while extensor muscles relax.

Question 11

A person steps on a sharp object with their right foot and immediately withdraws it while extending their left leg to maintain balance. Which reflex is responsible for the extension of the left leg?

Accepted Answer

Crossed extensor reflex

Question 12

Which connective tissue layer surrounds individual axons within a spinal nerve?

Accepted Answer

Endoneurium

Question 13

Which of the following equations correctly represents the relationship between the number of spinal nerve pairs and their regional distribution?

Accepted Answer

$$8 + 12 + 5 + 5 + 1 = 31$$

Question 14

Which branch of a spinal nerve innervates the deep muscles of the trunk and skin near the midline of the back?

Accepted Answer

Dorsal ramus

Question 15

Which of the following statements about the meninges of the spinal cord is CORRECT?

Accepted Answer

The pia mater is tightly bound to the surface of the spinal cord.

Question 16

A patient has damage to the ventral root of a spinal nerve. Which function is most likely impaired?

Accepted Answer

Motor output to muscles

Question 17

Which of the following nerves is NOT a branch of the brachial plexus?

Accepted Answer

Femoral nerve

Question 18

Which type of reflex is most likely involved when a weightlifter suddenly drops a heavy weight due to excessive tension in the tendons?

Accepted Answer

Golgi tendon reflex

Question 19

Which equation best represents the pathway of a polysynaptic reflex arc?

Accepted Answer

$$	ext{Sensory receptor} ightarrow 	ext{Sensory neuron} ightarrow 	ext{Interneuron}_1 ightarrow 	ext{Interneuron}_2 ightarrow 	ext{Motor neuron} ightarrow 	ext{Effector organ}$$

Question 20

Which of the following best describes the function of the cauda equina?

Accepted Answer

It consists of spinal nerve roots extending inferiorly from the lumbosacral enlargement and conus medullaris.

Spinal Cord and Spinal Nerves: Structure, Function, and Reflexes

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