Question 1

Which of the following best describes the function of ascending tracts in the spinal cord?

Accepted Answer

They transmit sensory information from the body to the brain.

Question 2

The spinal cord ends at approximately which vertebral level in adults, and what is the clinical significance of this?

Accepted Answer

It ends at L1; this allows for safe lumbar punctures below this level to avoid damaging the spinal cord.

Question 3

Which of the following lists the meninges in correct order from superficial to deep?

Accepted Answer

Dura mater, arachnoid mater, pia mater

Question 4

Cerebrospinal fluid (CSF) is found in which space surrounding the spinal cord?

Accepted Answer

Subarachnoid space

Question 5

A patient presents with flaccid paralysis after a spinal cord injury. Which tract is most likely affected?

Accepted Answer

Corticospinal tract (pyramidal tract)

Question 6

Which equation correctly represents the relationship between the number of spinal nerves and vertebral segments?

Accepted Answer

$$N_{spinal} = N_{cervical} + N_{thoracic} + N_{lumbar} + N_{sacral} + N_{coccygeal}$$

Question 7

Which of the following best describes a mixed nerve?

Accepted Answer

A nerve containing both sensory and motor fibers

Question 8

During a stretch reflex, such as the patellar reflex, which structure acts as the receptor?

Accepted Answer

Muscle spindle

Question 9

Which of the following statements about the withdrawal reflex is correct?

Accepted Answer

It is a polysynaptic reflex that causes contraction of flexor muscles in response to pain.

Question 10

Which nerve is the key nerve of the cervical plexus and is essential for diaphragm function?

Accepted Answer

Phrenic nerve

Question 11

A dermatome is best defined as:

Accepted Answer

An area of skin supplied by sensory fibers from a single spinal nerve root

Question 12

Which of the following reflexes is classified as autonomic?

Accepted Answer

Pupillary reflex

Question 13

In the cross-sectional anatomy of the spinal cord, what is located in the central canal?

Accepted Answer

Cerebrospinal fluid (CSF)

Question 14

Which of the following best explains why the cervical and lumbar regions of the spinal cord are enlarged?

Accepted Answer

They have more neurons to supply the limbs.

Question 15

Which tract carries pain and temperature sensations to the brain?

Accepted Answer

Spinothalamic tract

Question 16

Which equation represents the calculation of conduction velocity ($$v) in a $$myelinated axon, given distance ($$d) $$and time ($$t$$)?

Accepted Answer

$$v = d \div t$$

Question 17

Which of the following is true regarding the Babinski sign?

Accepted Answer

A positive Babinski sign in adults suggests upper motor neuron damage.

Question 18

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

Accepted Answer

Detects muscle tension to prevent over-contraction

Question 19

Which of the following is a characteristic of a monosynaptic reflex?

Accepted Answer

It has a faster response time than polysynaptic reflexes.

Question 20

Which of the following best describes the organization of white and gray matter in the spinal cord?

Accepted Answer

White matter is peripheral, gray matter is central.

The Spinal Cord: Structure, Function, and Reflexes

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