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Neuro > Nerve Tracts/Pathways > Flashcards

Nerve Tracts/Pathways Flashcards

1
Q

Thalamus

A

-interprets sensation information and perceives it

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2
Q

Name of Pathways

A

-origin and site of termination for 2nd order neruon

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3
Q

Types of Somatosensory Pathways to Brain

A

Conscious Relay:
-info about location and stimulus type to conscious awareness
-discriminative sensations

Divergent:
-info to many locations in brainstem and cerebrum
-conscious and non-conscious

Non-Conscious Relay:
-proprioceptive and other movement to cerebellum

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4
Q

Conscious Relay Pathways

A

-info about location and stimulus type to conscious awareness
-discriminative sensations
Crude Awareness: thalamus
Detailed Awareness: somatosensory cortex

Dorsal Column
Anterolateral Column

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5
Q

Divergent Relay Pathways

A

-info to many locations in brainstem and cerebrum
-conscious and non-conscious
-medial/slow nociception
-subconscious temperatue

Spinomesencephalic, spinoreticular and spino-emotional tracts

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6
Q

Non-Conscious Relay Pathways

A

-proprioceptive and other movement to cerebellum

Spinocerebellar Tracts

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7
Q

Grey Matter Fibers

A

-Motor
-cortex filled with cell bodies, folded in 6 layers
-Pyramidal cell: primary output

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8
Q

White Matter Fibers

A

Projection fibers, commissural fibers, Association fibers

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9
Q

Descending Motor Fibers

A

Pyramidal Tracts: cerebral cortex
Extrapyramidal Tracts: Brainstem

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10
Q

Flexor-Extensor Rule

A

-MNs that innervate flexors are located posteriorly to MNs that innervate extensors

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11
Q

Proximal-Distal Rule

A

-MNs that innervate distal muscles are located laterally to MNs that innervate proximal muscles

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12
Q

Lateral Corticospinal Tracts

A

-crossed at pyramidal decussation of medulla
-fractionated movements
-primary motor cortex
-most CST fibers
-descends in lat funiculus

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13
Q

Medial Corticospinal Tracts

A

-uncrossed
-postural movements
-originates from premotor cortex
-descends in venttral funiculus

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14
Q

Nonspecific Motor tracts

A

-facilitate activity of interneurons and MNs
-activate during intense emotions

Ceruleospinal and Raphespinal Tracts

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15
Q

Corticobrainstem Tracts

A

-voluntary control of many MM of head and neck
-originate in cortex motor areas and reach CN nuclei in brainstem

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16
Q

Secondary Somatosensory Gyrus

A

-post to primary
-processes info from primary and thalamus for stereognosis and sensory memory

17
Q

Dorsal Column Medial Leminiscus

A

-Ascending tract
-Light touch, proprioception, sterognosis

1st: Dorsal horn ganglion to FG or FC
2nd: Nucleus Gracilis or Cuneatus in Medulla

CROSS with Internal Arcuate Fibers
3rd: Thalamus to PSSC

18
Q

Anterolateral System

A

-ascending tract
-crude touch
Anterior: crude touch
Lateral: Fast nociception and temp

1st: Dorsal root ganglion to DH

CROSS at Anterior Commissure

2nd: Anterior commisure and travels up LST to thalamus
3rd: Thalamus to PSSC

19
Q

Medial Nociception

A

-dull/slow pain
-ascending, divergent pathway

1st: C fibers with free ending in DH

CROSS

2nd:
Spinomesencephalic: Sup. colliculi and periaqueductal grey

Spinoreticular: Reticular Formation

Spinoemotional: Cortex
-reaches consciousness

20
Q

Dorsal Spinocerebellar

A

-ascending, LE, uncrossed
-Nonconsious postural movements
-coordination and proprioception

1st: DRG to via FG Clark’s Nucleus
2nd: Up DPT through Inferior Cerebellar Peduncle to Cerebellum

21
Q

Ventral Spinocerebellar

A

-ascending, LE, crossed, bilateral
-Nonconsious postural movements
-coordination and proprioception

1st: Anterior Hron
CROSS
2nd: Up VPT through Superior Cerebellar Peduncle
CROSS to Cerebellum

22
Q

Cuneocerebellar

A

-ascending, UE, uncrossed
-Nonconsious postural movements
-coordination and proprioception

1st: DRG to Nucleus Cuneatus
2nd: Up NC through Inferior Cerebellar Peduncle to Cerebellum

23
Q

Rostrospinocerebellar

A

-ascending, UE, uncrossed
-Nonconsious postural movements
-coordination and proprioception

1st: DRG to Superior Cerebellar Peduncles to cerebellum

24
Q

Medial/Ventral Corticospinal Tract

A

-automatic trunk movements, uncrossed
-pyramidal

Premotor cortex > internal capsule > Cerebral Peduncle (midbrain)> FG> medial/anterior horn

25
Q

Lateral Corticospinal Tract

A

-voluntary limb mmts
-pyramidal

Primary Motor Cortex> internal capsule> Cerebral peduncles (midbrain)>crosses at decussation of medulla>FC>lateral horn

26
Q

Corticobulbar Tract

A

-facial movements
-Pyramidal

Primary motor cortex> cerebral peduncles> crosses a lot at CNs> exits cervical ventral horn

27
Q

Reticulospinal Tract

A

-extrapyramidal
-postural and gross movements (walking), extensors

Reticular formation in Pons>FG>ventral horn

28
Q

Vestibulospinal Tract

A

-extrapyramidal
-postural and vestibular movements
Medial: head and neck motions to maintain position
Lateral: limb and trunk reactions to gravity

Vestibular Nuclei in Pons and medulla>lateral column>ventral horn

29
Q

Rubrospinal Tract

A

-extrapyramidal

Red nucleus (midbrain)>cross> down RST of lat column>ventral horn

Neuro (30 decks)

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