202 T2 L2 Ascending and Descending Tracts of the Spinal Cord

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Which column is responsible for both ascending and descending tracts?

Ventral column

Which type of sensory information is carried in ascending tracts?

Both proprioceptive and exteroceptive information

How many neurons are typically involved in the circuit of ascending tracts?

Three neurons

Which pathway is responsible for carrying light touch and vibration information?

Dorsal column-medial lemniscus pathway

Which neurons enter the spinal cord via the dorsal root?

First order neurons

Where do first-order neurons synapse on second-order neurons in the medulla?

Nucleus cuneatus

Which tract is responsible for carrying pain, thermal, and non-discriminative touch information?

Spinothalamic tract

Where do second-order neurons cross in the spinal cord?

Dorsal horn

Which part of the spinal cord receives sensory input?

Dorsal horn

Which part of the spinal cord contains motor neuronal cell bodies?

Ventral horn

Which part of the spinal cord is expanded at levels that supply the limbs?

Lumbosacral enlargement

Which tracts carry afferent (sensory) impulses to centers within the brain?

Long ascending tracts

Which tracts carry efferent (motor) impulses from centers within the brain?

Long descending tracts

Which region of the spinal cord has lateral horns only in the thoracic region?

Thoracic region

Which part of the spinal cord organization has excellent organization of the dorsal, ventral, and lateral horns?

Grey matter

Which part of the spinal cord contains tracts that carry sensory impulses to/from the cerebral hemispheres?

White matter

Which tract carries proprioceptive information from the trunk and lower limb?

Dorsal spinocerebellar tract

Which tract carries proprioceptive information from the upper limb?

Cuneocerebellar tract

Where do the spinocerebellar tracts terminate?

In the cerebellum

Which tract ascends in the lateral column to the cerebellum?

Dorsal spinocerebellar tract

What is the main function of the corticospinal tract?

Control of muscular activity

How many neurons are there in the corticospinal tract pathway?

Two

Where do the upper motor neurons in the corticospinal tract originate from?

Cerebral cortex

Where do the lower motor neurons in the corticospinal tract originate from?

Ventral horn

What is the clinical presentation of upper motor neuron disease?

Increased muscle tone and overactive tendon reflexes

Which part of the spinal cord contains the cell bodies of lower motor neurons?

Ventral horn

What is the function of the dorsal horn in the spinal cord?

Receives sensory input

Which part of the spinal cord is responsible for innervating skeletal muscles?

Ventral horn

What is the basic organization of the spinal cord?

White matter in columns

Which part of the spinal cord contains more grey matter?

Cervical region

Which tracts carry motor information from the brain down towards the spinal cord and out towards the periphery?

Descending tracts

Which type of sensory information is carried in the ascending tracts?

Extra receptive information

Where do the primary sensory neurons (first-order neurons) enter the spinal cord?

Dorsal roots

Which pathway is responsible for carrying information about light touch and vibrations?

Dorsal column medial lemniscus pathway

What type of information is carried in the dorsal column medial lemniscus pathway?

Light touch and vibrations

Where do the first-order neurons of the dorsal column medial lemniscus pathway synapse on second-order neurons?

In the brainstem

Which part of the spinal cord contains tracts that carry sensory impulses to/from the cerebral hemispheres?

White matter

Which region of the spinal cord contains tracts that carry sensory impulses to/from the cerebral hemispheres?

Cervical region

Which part of the spinal cord is expanded at levels that supply the limbs?

Cervical enlargement

What is the main function of the corticospinal tract?

Carrying motor impulses from the brain to the spinal cord

Which column in the spinal cord is responsible for carrying ascending and descending tracts?

Lateral column

Which tracts are responsible for carrying proprioceptive information from the upper and lower limbs respectively?

Dorsal ventral spinal cerebellar tracts and Cuneo cerebellar tracts

Which side of the cerebellum controls the left side of the body?

The left cerebellar hemisphere

Where do the pyramidal tracts pass through?

The pyramids of the medulla

Which pathway controls all of the skeletal muscles?

The corticospinal tract

Which part of the brain receives information from the third order neurons in the somatic sensory pathway?

Thalamus

What is the term used to describe the loss of balance and coordination due to a lack of proprioceptive input to the somatic sensory cortex?

Sensory ataxia

What is the clinical test used to assess for sensory ataxia in patients with lesions of the dorsal column?

Romberg sign

Which tract carries information about pain, thermal sensations, and non-discriminative touch to the brain?

Spinothalamic tract

Which part of the brain stem do the axons of the upper motor neurons pass through?

Cerebral pyramids

Which part of the medulla do the axons of the upper motor neurons enter?

Cerebral pyramids

What do the axons of the upper motor neurons form within the medulla?

Lateral cortical spinal tracts

What percentage of fibers in the corticospinal tract cross the midline to enter the spinal cord?

80%

What is the main function of the corticospinal tract?

Carrying motor information from the brain

Which parts of the motor cortex innovate the lower limb and upper limb, respectively?

Medial and lateral parts

Test your knowledge on the ascending and descending tracts of the spinal cord in this quiz. Explore the anatomy of the spinal cord, including its grey and white matter. Learn about the functions and disorders of cerebrospinal fluid and the ventricular system. Join Professor Andrew Dilley for a comprehensive review of these important topics.

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