Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
CNS - Tracts - PCC
Tracts - 2nd lecture exam
| Question | Answer |
|---|---|
| Function of the fasiculus proprious tract | Coordination for spinal reflexes |
| Fine movement proprioceptive fibers from the pectoral girdle and upper extremity enter the cervical cord and ascend to synapse in the M.O.'s ___? | Accessory cuneate nucleus |
| Which 2 tracts deal with heart, BP and respiratory rates and rythms? They also do what? | Medial and lateral reticulospinal tracts. Alternate pathway is corticospinal tracts are damaged |
| Fiber diameter of corticospinals | 2-25 microns |
| What tract assumes corticospinal function if they are damaged? | Rubrospinal and reticulospinal |
| Dorsal lateral tract of lissauer is located where? | Between lamina 1 and posterior lateral sulcus |
| CNs that enter the spinotrigeminal tract? | 5, 7, 9, 10 |
| Input from nucelus gracilis and cuneatus enters the medial lemniscus via what? | Internal arcuate fibers |
| Where does the anterior corticospinal tract terminate? do they cross? | Mid thoracic level and yes, they do cross |
| Corticospinal fibers decrease as the descend. ___ cervical ___thoracic ____ lumbosacral | 55%, 20%, 25% |
| The lateral corticospinal tract contains ___ to ___ % of total corticospinal fibers? | 85-95% |
| Where do lateral corticospinal fibers cross over? Why do they cross? | Pyramids of the medulla oblongata and we don<t know |
| What tract has the longest, uniterupted axon in the body? | Corticospinal |
| Anterior corticopsinal tract has only ___ to ___% of total corticospinal fibers? | 5-15% |
| Which lamina do most of the corticospinal tracts synapse with? From here, they like to go to lamina ___? Then they go out to do their buisness. | 7, 9 |
| Function of gracilis and cuneatus tracts? | 1. Discrimatory (2 point) touch 2. Vibratory sensation 3. Kinesthetic senstion |
| Spinothalamic tract : does the DRG enter the tract directly? | No, it synapses first in the gray matter then it enters the tract |
| Spinothalamic tract : Pain and thermal receptors cross over ___ and light touch crosses over ___ | 1. Immediatly 2. Gradually |
| Spinothalamis tract neuron #2 ascends to what? | Thalamus |
| Spinothalamic tract neuro #3 goes to what? | Post central gyrus |
| The spinothalamis tract is found at what cord levels? | All |
| What does the spinothalamis tract do as it ascends? | It enlarges |
| First fibers to be myelinated in the fetus? | Fasiculus proprius |
| Where is the earliest spontaneous movement are integrated here | Fasiculus proprius |
| What is the function of the spinothalamis tract? Lateral portion? Anterior portion? | 1. Pain and thermal 2. Light touch (Lewellen's musquitto) |
| Where is the origin of the anterior spinocerebellar tract? | Lumbosacral cord grey lamina |
| Anterior spinocerebella tract crosses over ___ and again as they enter the ____. | 1. Immediately 2. Cerebellum |
| Anterior spinocerebellar terminates in the ___ via the ____ | Cerebellum via the superior cerebellar peduncle |
| Which tract is the only one that double crosses? | Anterior spinocerebellar |
| Where does the anterior spinocerebellar terminate? | Cerebellum |
| Function of the anterior spinocerebellar tract? | Sends info to the cerebellum regarding gross movements of lower body parts...of what is about to happen |
| Tract that caries fibers up to Clark<s column from the lower extremity? | Gracilis |
| Fibers of the posterior spinocerebellar tract originate from ___ | Clark's column : C8-L3 |
| Clark's colum is found from ____ Posterior spinocerebellar tract does not go below ___. | C8-L3 L3 |
| Only about ___% of neurons of the corticopsinal tract terminates directly in lamina 9. What are these called? | 3% Betz cells |
| These neurons initiate skilled voluntary movement | Pyramidal neurons |
| These neurons ensure that our movements are smooth and effective | Extrapyramidal neurons |
| Tract functioning in chewing, swallowing, moving the eyes together, and maintains equilibrium | Medial longitudinal fasiculus |
| Describe the spinal trigeminal tract | 1. Pain and heat enter through the CNs to spintrigeminal tract 2. Fibers then synaspe with spinotrigeminal nuclei 3. Fibers then ascend up the ventral trigeminothalmic tract up to the thalamus |
| 85-95% of the 2 million corticopsinal nerve fibers enter the ___ | Lateral corticospinal tract |
| The tectospinal tract originates where? | Superior colliculus of midbrain tectum |
| Does the tectospinal tract cross as it descends? | Yes |
| Is the tectospinal tract pyramidal or extrapyramidal? | Extrapyramidal |
| Function of the tectospinal fibers? | 1. POstural reflex enhancement dealing with sight and auditory stimuli 2. It makes adjustements to the trapezius and SCM to move the head |
| The mdeial lemniscus accepts input from the ____ of the gracilis and cuneatus tracts via what? It terminates in the what? | 1. Oposit side 2. internal arcuate fibers 3. Thalamus |
| From what 2 tracts does the medial lemniscus accept input? | Oposite side of gracilis and cuneatus |
| Spinal trigeminal nucleus receives ___ and ___ reception from the face via which nerves? | 1. Thermal 2. Pain 3. 5,7,9,10 |
| Origin of rubrospinal tract? Do fibers cross as they descend? | 1.Red nucleus of midbrain 2. Yes |
| What ais the name of the corticopsinal fibers that synapse with lamina 9? | Betz cells |
| How far down the cord does the vestibulospinal tract run? | All the way down |
| What nucelus does cuneocerebellar tract synapse with? Where is it located? | Accessory cuneate nucelus in the MO |
| Function of the lateral corticospinals? | Initiates precise skilled motor function especially with distal extremities |
| Function of the anterior corticospinals? | Unclear: influences neck and shoulder muscles |
| Vestibulospinal tract originates in vestibular nucleous in ___? do fibers cross? | 1. MO 2. No |
| Tract responsible for the fine proprioceptive movements of pectoral girdle? | Cuneocerebellar tract |
| Tract responsible for fine proproceptive movements from what just happened in muscles themselves. | Posterior spinocerebeallar |
| Tracts responsible for two point touch, vibratory sensations and kinesthetic input | Gracilis and cuneatus |
| Tract dealing with pain and thermal senstions and light touch | Spinothalamic tract |
| DRG enter the cord and ascend via the gracilis tract in the ___ part of the body. Cuneatus enters above ____? Do they cross over when DRG enters tracts? | 1. Lower 2. T6 3. No |
| Gracilis and cuneatus fibers fuse superior to their respective nuclei called the what? | Medial Lemniscus |
| Function of the rubrospinal tract | Muscle tone for contralateral hand and foot musculature |
| Where do fibers from the posterior spinocerebellar tract terminate? | Cerebellum via the inferior cerebellar peduncles |
| Gracilis and cuneatus terminate in the ___ in the ___ and the ___ respectively | 1.MO 2. Nucelus gracilis 3. Nucleus Cuneatus |
| 5 results of lower motor lesions | 1. Hyperflexia 2. Hypotonia 3. Lack of movement 4. Atrophy of muscles 5. Flacid paralysis |
| Tract responsible for gross movement of lower body and what is about to happen? | Anterior spinocerebellar tract |
| 4 results in upper motor neurons | 1. Hypersensitivity 2. Spastic movements 3. Babinbsky 4. Voluntary Paralysis |
| Neurons that originates in spinal cord or brainstem and the extend to the PNS | Lower motor neurons |
| If you have an upper motor lesion what will happen? | Lower moton neurons wiull not be able to be influenced by the UMNs. This will result in uncoordinated movements such as in cerebral palsy |
| What happens during a lower motor neuron lesion? | Little impulse will ever reach the muscle (lack of movement) such as in Polio |
| Function of the spinotrigeminal tract? | Sensation of pain and thermal from the face |
| Fibers of the tectospinal tract terminate where? | Upper 4 cervical cord level |
| Gracilis and cuneatus: After they reach their nuclei, they ascend via the ___? Do they cross over after their nuclei? Where does the second neuron ascend to? Is their a third neuron? Where does it ascend to? | 1.Medial Lemniscus 2. Yes 3. Thalamus 4. Yes, post central gyrus |
| Do fibers of the posterior spinocerebellar cross over? | No, they are ispsilateral |
| Function of the posterior spinocerebellar tract? | Fine proprioceptive input on what just happened in the muscle |
| Proprioceptive fibers dealing with fine movement of the lower extremities may enter the cord below clark's column. What tract carries them up to synapse with clark? | gracilis |
| Function of the vestibulospinal tract | Maintains proper orientation when falling. Postural adjustements of ipsilateral extensor muscles... falling on ice |
| Fibers that leave the acessory cuneate nucleus form the ___? They ascend to the ___ through the ___ same as the ___? | 1. Cuneocerebellar tract 2. Cerebellum 3. Inferior cerebellar 4. Posterior spinocerebellar tract |
| The anterior and lateral corticospinal tacts are motor fibers originating in the ___ downward. | Motor cortex |
| Lesions of the spinothalamic tracts can lead to what? | 1. Analgesia 2. Thermoanesthesia |
| Rubrospinal tract reaches ___ cord levels. What does it influence? | 1. All cord levels 2. Contralateral hand and foot musculature |
| Spinotrigeminal nuclei extends from the ___ through the ___ down to the ____ cord level | 1. Pons 2. MO 3. C1-C4 |
| Tracts that are Ispilateral (6) | 1. Gracilis 2. Cuneatus 3. Posterior spinocerebellar 4. Vestibulospinal 5. Medial Reticulospinal 6. Lateral Reticulospinal |
| Tract that are contralateral (6) | 1. Spinothalamic 2. Anterior spniocerebellar 3. Anterior corticospinal 4. Lateral Corticospinal 5. Tectospinal 6. Rubrospinal |
| Cord level of gracilis | All |
| Cord level of cuneatus | T5 or T6 and up |
| Cord level of spinothalamic | All |
| Cord level of anterior spinocerebellar | All |
| Cord level of posterior spinocerebellar | C8 to L3 |
| Cord level of cuneocerebellar | C8 and up |
| Cord level of anterior coticospinal | Terminates by T6 |
| Cord level of lateral corticospinal | All |
| Cord level of Tectospinal | Terminates in upper 4 cervical levels |
| Cord level of rubrospinal | All |
| Cord level of Vestibulospinal | All |
| Cord level of medial reticulospinal | All |
| Cord level of lateral reticulospinal | All |
| Cord level of fasiculus proprius | All |
| Cord level of the Dorsolateral tract of lissauer | All |
| Which tract may or may not cross over? | Fasiculus proprius |
| Gracilis stops picking up infor around ___ | T6 |
| ___ brings info from the lower limbs | Gracilis |
| ___ brings info from the upper limbs | Cuneatus |
| The double crosser! | Anterior spinocerebellar |
| Do for upper limb what clark's nucleus and posterior spinocerebellar do for lower limbs | Cuneocerebellar |
| Carries most of corticospinal fibers | Lateral |
| Influences trap and SCM | Tectospinal |
| If corticopsinals are damaged, it helps out | Rubrospinal and medial + lateral reticulospinal |
| Maintains orientation in falling | Vestibulospinal |
| Spinospinal fibers | Fasiculus proprius |
| Synapses in rexed lamina 2 | Dorsolateral tract of lissauer |
Created by:
LrB
Popular Science sets