Spinal Cord Touro Neuroscience Quiz

The cervical enlargement is located between___________ and is enlarged due to the _______________.

• C1-C4, cervical plexus for head and neck region making the dorsal gray matter bigger.

• C1-C4, brachial plexus for upper limbs making the dorsal gray matter bigger

• C4-T1, brachial plexus for upper limbs making the dorsal gray matter bigger

• C4-T1, brachial plexus for respiratory function making the dorsal gray matter bigger

The anterior spinal artery branches are located in the ____________.

• Anterior medial fissure

• Anterolateral tract

• Anterolateral sulcus

• Anterior medial sulcus

In the upper thoracic and cervical spinal cord, the posterior intermediate sulcus divides the ____________.

• Anterolateral tract from dorsal columns

• Dorsal columns

• Anterolateral tract from the corticospinal tract

• Corticospinal tract

There are ________ pairs of spinal nerves and the region that has one more than it's number of vertebrae is the _________.

Spinal nerve T7 emerges between T6 and T7.

• True

• False

GSA, somatic sensory fibers, transmit information from _______________.

• Receptors for hearing and vision

• Mechanoreceptors and nociceptors

• Receptors in skin, muscle, tendons, and joints

• Receptors in smooth muscle, cardiac muscle and glands

Local anesthetic drugs are injected into this space to anesthetize the lumbar and sacral spinal nerves during operative procedures and for postoperative pain control

• Sub-pia mater

• Subarachnoid

• Subdural

• Epidural

The spinal cord is stabilized by these structures:

• Denticulate ligaments

• Collagen fibers of subarachnoid space

• Filum terminale

The filum internim is a continuation of a pial thread that caudally pierces the thecal sac to become surrounded by dura and attach to the coccyx.

• True

• False

The dorsal horn contains laminae:

• VII

• I-VI

• X

• VIII & IX

Lamina ____________ recieves descending motor pathways and proprioceptive input from the periphery and is located in the _________.

• VI, ventral horn

• VI, dorsal horn

• VII, intermediate zone

• VII, central canal

The _________of Clarke (Clarke’s column) is found in the dorsal medial part of lamina VII at spinal segments _______. The nucleus receives proprioceptive input from muscle and sends axonal projections to the ipsilateral cerebellum (dorsal spinocerebellar tract).

• Posteromarginal nucleus, C8-L2

• Substantia gelatinosa, T4-L2

• Nucleus dorsalis, C8-L2

• Interomediolateral cell column, T1-L2

The ____________nucleus is located in spinal segments C3-C5.

• Somatic motor

• Phrenic

• Nucleus dorsalis

• Cervical autonomic

Nuclei in the ventral horn are somaticotopically arranged so that the flexors are dorsally located and the extensors are ventrally located.

• True

• False

The crossed extensor reflex refers to

• Signal crosses through the dorsal horn to directly stimulate the withdrawl from nocioceptive stimulis by activating extensors and inhibiting flexors in ipsolateral leg.

• Signal transversing the midline and activation of extensors contralaterally to support the body on the opposite leg.

• The nocioceptive signal synapses on the contralateral side and so the withdrawl signal must cross the midline to activate the extensors and inhibit the flexors in the correct leg

• Motor pathways cross in the intrafusal muscles while delivering withdrawl signal to extensors.

The myotactic reflex stimulates ____________ muscles and inhibits ___________ muscles from the tapped tendon.

• Contralateral, ipsolateral

• Opposite, same

• Intrafusal muscles, extrafusal muscles

• Same, opposite

The corticospinal tract conveys______________.

• Discriminative touch, vibration, joint position

• Sensory from the upper extremities

• Skilled, volitional movement

• Crude touch, pain, temperature

Spinocerebellar tract motor information is under conscious control.

• True

• False

If you took an axial CT scan at the level of S3, would you be able to visualize the cuneatus tract?

• No, because the spinal cord white matter does not descend as far as S3

• No, because this white matter tract is only above T6 as it has signals from upper extremities

• Yes, because it is continuous through the entire spinal cord

• Yes, because this white matter has fibers that convey information from the lower extremities

Internal arcuate fibers of the dorsal column tract decussation in the ____________.

• Thalamus

• Medulla

• Midbrain

• Immediately in the spinal cord segment

Which tract has a lesion if coordination problems begin to occur?

• Spinocerebellar

• Corticospinal

• Dorsal column

• Anterolateral system

All of the fibers in the coricospinal tract decussate in the medulla.

• True

• False

The rubrospinal tract is the minor descending motor pathway for the _______________.

• Lower limbs

• Respiratory muscles

• Upper limbs

• Intrinsic back muscles

Reticulospinal tract is responsible for_______________________

• Excitatory to extensor (antigravity) musculature and act to maintain body posture and orientation in space

• Unconscious coordination signals

• Flex arms and forearms

• Extensor muscle posture and tone