Nervous System Flashcards

1
Q

Classifications of the spinal tracts

A
  1. Spinothalamic (Antero-lateral)
  2. Dorsal Column Medial Lemniscus 3. Spinocerebellar
  3. Trigemino-thalamic
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2
Q

Modalities for spinothalamic tract

A

Anterior: crude touch, pressure
Lateral: pain and temperature

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3
Q

Process for spinothalamic tract

A

1º neuron at drg

2º neuron at DH of grey matter @ spinal cord, decussates and crosses midline to

3º neuron at thalamus

sensory cortex (post central gyrus) in cerebral cortex (where sensory information is CONSCIOUSLY perceived)

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4
Q

Modalities for dorsal column medial lemniscus

A
  1. Fine, discriminative touch
  2. Vibration and pressure
  3. Conscious proprioception
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5
Q

Process for DCML

A

1º neuron at DRG, receives stimulus from Meissner’s corpuscles, Pacinian corpuscles

2º neuron at MEDULLA OBLONGATA decussates & crosses midline

3º neuron at THALAMUS where sensory information is processed and relayed to

sensory cortex

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6
Q

Functions of spinocerebellar system

A
  1. Control muscle tone
  2. Coordination
  3. Regulate movements
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7
Q

Process of spinocerebellar system

A

1º neuron at DRG

2º neuron at DH @ spinal cord
(1) Dorsal spinocerebellar tract (dominant), DO NOT CROSS –> inferior cerebellar peduncle (cerebellum)

(2) Ventral spinocerebellar tract, DECUSSATES –> superior cerebellar peduncle (cerebellum)

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8
Q

What are the 4 cutaneous mechanoreceptors

A
  1. Meissner’s corpuscles
  2. Merkel’s disc
  3. Ruffini nerve ending
  4. Pacinian corpuscle
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9
Q

Function of Meissner’s Corpuscle

A

Changes in texture, slow vibrations

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10
Q

Function of Merkel’s disc

A

Sustained touch and pressure

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11
Q

Function of Ruffini’s nerve endings

A

Sustained pressure

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12
Q
A
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13
Q

Classification of the Somatic Motor Pathways

A

PYRIMIDIDAL SYSTEM
1. Corticospinal tract
2. Corticobulbar tract (Nuclear)

EXTRAPYRIMIDAL SYSTEM
1. Rubrospinal tract
2. Tectospinal tract
3. Vestibulospinal tract
4. Reticulospinal tract

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14
Q

Function and process of rubrospinal tract

A
  1. Neuronal cell bodies of UMNs @ RED NUCLEUS of midbrain
  2. VH of spinal cord (synapse)
  3. LMNs → FLEXOR MUSCLES
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15
Q

Function and process of TECTOspinal tract

A
  1. Neuronal cell bodies of UMNs @ superior colliculus/ TECTUM of midbrain
  2. VH of spinal cord
  3. LMNs → REFLEX TO VISUAL STIMULI
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16
Q

Function and process of vestibulospinal tract

A
  1. Neuronal cell bodies from VESTIBULAR NUCLEI @ PONS
  2. (a) MEDIAL → VH of cervical cord → correct position of head and neck

(b) LATERAL → VH of LUMBAR cord → extensor muscle, tone and equilibrium

17
Q
A