Mod 2 Flashcards

1
Q

Function and structure of the SNS

A

Release sweat
Contraction of arrector pilli
Dilation
Vasoconstriction
Accelerates heartbeat
Increase force of contraction
Reduce peristalsis in alimentary canal
Dilate pupils
Contract smooth muscles to open eyelids
Increase peristalsis carrying spermatozoa
Relax smooth muscle for easier breathing
Release epinephrine

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2
Q

Function and structure of the PSNS

A

Constrict pupils
Contract to relax suspensory ligaments
Tear and serous secretion flow
Decrease heartbeat
Bronchioconstriction
Respiratory, pancreas, and alimentary canal gland secretion
Alimentary canal peristalsis
Relax sphinceter muscles
Facilitates bile release
Stimulates erection

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3
Q

Neurotransmitters of the ANS

A

PSNS is primarily cholinergic.
- responds to acetylcholine
- nicotinic: PSNS and SNS
- muscarinic: PSNS
SNS is primarily adrenergic.
- respond to epinerphrine

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4
Q

Motor areas

A

Premotor cortex: postural and axial movements
Supplementary motor cortex: trunk and girdles, bilateral coordination
Fontal eye fields: coordinate eye movements
Cingulate motor areas: emotional aspects of movement

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5
Q

Motor areas of the cerebral cortex

A

The grey matter of the cerebral cortex has 6 layers of cells, each with a specific function.
- Layer V is most prominent with pyramidal cells of the UMN
Cell columns serve one specific area of the body

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6
Q

Path of the corticospinal tract

A

Axons descend:
1. corona radiata
2. internal capsule
3. midbrain
4. pons
5. most fibers decussate in the lower medulla
6. spinal cord

Will synapse on one of three cells:
1. interneurons
2. alpha motor neurons
3. gamma motor neurons

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7
Q

Lateral and anterior corticospinal tracts

A

Lateral:
- distal musculature
- damage –> UMN symptoms
Anterior:
- axial, girdle musculature

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7
Q

Corticonuclear tract

A

Terminate in head and neck
Synapses on:
- cranial nerve nuclei
- brachiomotor nuclei (skeletal mm of head and neck)

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8
Q

Muscle spindles

A

Extrafusal muscle fibers make up the bulk of the muscle and cause muscular contraction leading to movement.
- innervated by alpha motor neurons
Intrafusal muscle fibers make up the muscle spindles and provide feedback regarding muscular contraction
- innervated by gamma motor neurons and sensory fibers

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9
Q

UMN symptoms

A

Spastic
Hypertonic
Hyperreflexic
Disuse atrophy
Positive babinsky

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10
Q

LMN symptoms

A

Flaccid
Hypotonic
Hyporeflexic
Denervation atrophy
Negative babinsky

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11
Q

Descending motor pathways

A

Corticotectal and tectospinal tracts
Corticorubral, rubrobulbar, and rubrospinal tracts
Corticoreticular and reticulospinal tracts
Vestibulospinal tracts

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12
Q

Corticotectal and tectospinal tracts

A

Coordinate head and eye movements
Tectum: where the superior colliculus resides

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13
Q

Corticorubral, rubrobulbar, and rubrospinal tracts

A

Coordinate hand and digits
Red nucleus: facilitates alpha and gamma neurons

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14
Q

Corticoreticular and reticulospinal tracts

A

Coordinates posture and limb movements
Reticular system: functions in consciousness

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15
Q

Vestibulospinal tracts

A

Maintains posture and balance
Vestibular system: equilibrium

16
Q

Components of spinal reflexes

A

Sensory receptors
Sensory nerves
Motor nerves
Skeletal muscle

17
Q

Skeletal muscle receptors

A

Muscle spindle: within the muscle, velocity and length
Golgi tendon organ: within muscle tendon, amount of tension

18
Q

Specific spinal reflexes

A

Muscle stretch reflex
Reciprocal inhibition
Autogenic inhibition
Flexor reflex
Crossed extension reflex

19
Q

Muscle stretch reflex

A

Deep tendon reflex
Monosynaptic
Enhanced by reciprocal inhibition

20
Q

Reciprocal inhibition

A

Primary mover contracts, antagonist muscle relaxes
Involved inhibitory interneuron
One muscle (e.g., the extensor) is stimulated to undergo contraction, while another muscle (e.g., the flexor, its antagonist) is simultaneously inhibited from undergoing contraction and, therefore, relaxes.

21
Q

Autogenic inhibition

A

GTO fine tunes movement and inhibits further contraction
Sends inhibitory signal when too much tension is being placed on one muscle.
GTOs are specialized receptors that monitor the tension applied to tendons generated mainly by muscle contraction.
Muscle contraction causes the sensory endings terminating on tendons (the GTOs) to discharge.

22
Q

Flexor reflex

A

Withdrawal reflex
Response of an entire limb to noxious stimulus resulting in flexion/ withdrawal
The flexor reflex is elicited by stimulation of cutaneous receptors and includes a reflex response across several joints involving an entire limb.

23
Q

Crossed extension reflex

A

Maintains balance/posture
The crossed extension reflex occurs to maintain balance and upright posture following contact with a noxious stimulus.
The “crossed extension reflex” occurs in the contralateral limb that does not encounter the noxious stimulus.

24
Q

Parts of the basal nuclei

A

Caudate nucleus
Putamen
Globus pallidus
Subthalamic nucleus
Substantia nigra

25
Q

Integration of movement

A
26
Q

Direct pathway of basal nuclei to motor cortex

A

End product: inhibition (from the thalamus) is lifted resulting in thalamic excitation of motor cortex
Allows deliberate, purposeful movement.

27
Q

Huntington’s

A

Destruction of GABAergic influence on the lateral globus pallidus
Ultimately results in decreased inhibition which means the cerebral cortex is overstimulated
Agonist to direct pathway.

28
Q

Indirect pathway of the basal nuclei to the motor cortex

A

End product: inhibition is enhanced leading to thalamic inhibition of the motor cortex
Inhibits excessive, purposeless movements

29
Q

Parkinson’s

A

Destruction of the dopaminergic cells of the substantia nigra
Ultimately results in increased thalamic inhibition which means the cerebral cortex is understimulated
Agonist to indirect pathway
- too much suppression

30
Q

Lobes of the cerebellum

A

Flocculonodular: vestibular sustem
Anterior: spinal cord - inferior peduncle
Posterior: cerebral cortex - superior peduncle

31
Q

Afferents of the cerebellum

A

Come from
- vestibular system
- cerebral cortex
- spinal cord
- deep brain structures

32
Q

Efferents of the cerebellum

A

Come from
- purkinje cells: inhibitory
- deep cerebellar nuclei