Q: Which equation best represents the negative feedback mechanism of a simple stretch reflex?

$$\Delta L_{muscle} \rightarrow \text{increased AP frequency} \rightarrow \text{motor neuron activation} \rightarrow \text{muscle contraction} \rightarrow \Delta L_{muscle} \downarrow$$

Q: Which equation best describes the function of the Golgi tendon organ in preventing tendon evulsion?

$$\text{Increased tension} \rightarrow \text{Golgi tendon organ activation} \rightarrow \text{inhibition of motor neuron} \rightarrow \text{muscle relaxation}$$

Question 1

Which of the following best describes the primary roles of the spinal cord in the central nervous system?

Accepted Answer

It acts as both a relay station between the body and brain and a processing station for reflexes.

Question 2

Which meningeal layer of the spinal cord is responsible for anchoring the spinal cord to the vertebral cavity via denticulate ligaments?

Accepted Answer

Pia mater

Question 3

A patient undergoes a spinal tap to withdraw cerebrospinal fluid (CSF). From which space is the CSF most commonly withdrawn?

Accepted Answer

Subarachnoid space

Question 4

Which structural feature marks the cone-shaped distal end of the spinal cord?

Accepted Answer

Conus medullaris

Question 5

If a patient suffers damage to the cervical enlargement of the spinal cord, which function is most likely to be affected?

Accepted Answer

Motor and sensory function of the upper extremities

Question 6

Which of the following statements about the spinal dura mater is TRUE?

Accepted Answer

It consists only of the meningeal layer.

Question 7

Which region of the spinal cord gray matter contains neuron cell bodies involved in somatic motor function?

Accepted Answer

Anterior horn

Question 8

The cauda equina is best described as:

Accepted Answer

A bundle of spinal nerve roots extending inferiorly from the conus medullaris

Question 9

Which spinal cord tract carries proprioceptive and touch information from the lower limbs and trunk?

Accepted Answer

Fasciculus gracilis

Question 10

A lesion in the anterior funiculus of the spinal cord would most likely affect which type of pathway?

Accepted Answer

Descending motor pathways

Question 11

Which equation best represents the negative feedback mechanism of a simple stretch reflex?

Accepted Answer

$$\Delta L_{muscle} ightarrow 	ext{increased AP frequency} ightarrow 	ext{motor neuron activation} ightarrow 	ext{muscle contraction} ightarrow \Delta L_{muscle} \downarrow$$

Question 12

Which nerve plexus is responsible for innervating the diaphragm via the phrenic nerve?

Accepted Answer

Cervical plexus

Question 13

Damage to the sciatic nerve would most likely result in impairment of which muscle group?

Accepted Answer

Hamstrings (knee flexors)

Question 14

Which of the following best explains why injury to one spinal nerve does not completely eliminate sensory or motor innervation to a body region?

Accepted Answer

Nerve fibers from different spinal nerves intermingle in plexuses.

Question 15

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

Accepted Answer

Each spinal nerve is formed by the union of a dorsal and ventral root.

Question 16

Which reflex is most likely to be triggered by a painful stimulus and involves reciprocal inhibition?

Accepted Answer

Withdrawal (flexor) reflex

Question 17

Which equation best describes the function of the Golgi tendon organ in preventing tendon evulsion?

Accepted Answer

$$	ext{Increased tension} ightarrow 	ext{Golgi tendon organ activation} ightarrow 	ext{inhibition of motor neuron} ightarrow 	ext{muscle relaxation}$$

Question 18

Which spinal cord tract is responsible for transmitting crude touch, pain, and temperature sensations to the thalamus?

Accepted Answer

Spinothalamic tract

Question 19

A patient presents with loss of proprioception and fine touch in the right lower limb. Which tract is most likely damaged?

Accepted Answer

Right fasciculus gracilis

Chapter 12: Central Nervous System – Spinal Cord Structure and Function

Guida di studio - Domande di pratica

Study guide - Flashcard