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BIOM 3000 (Final) > 6- Spinal Cord and Tracts > Flashcards

6- Spinal Cord and Tracts Flashcards

1
Q

Afferent Info Streams

A

Local Reflexes

To cortex

To cerebellum

Info goes to all 3 streams simultaneously

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2
Q

Spinal Cord Ends At

A

Conus Medullaris at L1/L2

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3
Q

Cauda Equina

A

Collection of nerve terminals (L3-S5) caudal to the conus medullaris

Formed from lower spinal nerves descending before exiting spinal cord

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4
Q

Filum Terminale

A

Fibrous tissue connecting conus medullaris to coccyx

Made of pia mater- anchors spinal cord to vertebrae

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5
Q

Dermatomes

A

Mesoderm—-> somites

Somites retain connectivity with originating vertebral level

Somites differentiate

Result in different regions of the body connected to different parts of spinal cord

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6
Q

Lissauer’s Tract

A

Entry point of some DRG fibers

In PH

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7
Q

Intermediate Gray (IG)

A

Contains interneurons adn tract cells , some autonomic pre-ganglionic MN

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8
Q

Ventral Horn (VH)

A

Has motor neurons

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9
Q

Substantia Galatinosa

A

Superficial zone of DH

Has nerve terminal

In PH

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10
Q

Rexed Laminae

A

Defined by cellular structure

I-X

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11
Q

Rexed Laminae- DH

A

I-VI

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12
Q

Rexed Laminae- IG

A

VII

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13
Q

Rexed Laminae-VH

A

VIII-IX

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14
Q

Central Canal

A

X

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15
Q

Fibers of the Spinal Cord

A

Long ascending—> thalamus, cerebellum, brainstem

Long descending–> from cortex to spinal cord

Local propriospinal- shorter fibers that interconnect different parts of spinal cord

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16
Q

Spinal Tracts

A

Carries specific type of sensory/motor info

Most tracts consist of 2-3 neurons

Has a consistent location at all spinal cord level

Usually cross over at some point

17
Q

Ascending Tracts

A

Dorsal Column Medial Lemniscal

Spinocerebellar

Anterolateral (spinothalamic)

18
Q

Spinocerebellar Tract

A

Provide info from legs

Ipsilateral to cerebellum

19
Q

Cuneocerebellar Tract

A

Info from arms

Ipsilateral to cerebellum

20
Q

Reticulospinal Tract

A

Involved in locomotion and posture (need to be awake to move)

Includes pontine and medullary branches

21
Q

Tectospinal Tract

A

Orientation of head towards source of visual or auditory stimuli

Descending

22
Q

Vestibulospinal Tract

A

Centre of gravity/posture

Descending

23
Q

Raphespinal Tract

A

Pain modulation

Descending

24
Q

Symptoms of UMN Damage

A

Shock (paralysis and areflexia) followed by hyperreflexia

25
Q

Symptoms of LMN Disease

A

Paral

ysis followed by areflexia and muscle atrophy

26
Q

IG- Sympathetic Pre-Ganglionic

A

Thoracolumbar

27
Q

IG- Parasympathetic Pre-Ganglionic

A

Sacral and cervical

28
Q

Symptoms of Nerve Root Compression

A

Most common in lower cervical and lumbar regions

Pin in muscle

Paraesthesia (numbness)

Loss of cutaneous snesory info

Loss of spinal reflex

BIOM 3000 (Final) (8 decks)

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