Spinal Cord, Spinal Nerves, & Somatic Reflexes
Order by
31 terms
Terms | Definitions |
|---|---|
 The 4 main descending tracts are: | 1) corticospinal 2) tectospinal 3) lateral & medial reticulospinal 4) lateral & medial vestibulospinal |
| The corticospinal tract is divided into ______ and ________ . Most corticospinal fibers decussate in the lower medulla to form the _______ . The fibers of the _________ decussate in the _________ . | - lateral - ventral (anterior) - lateral corticospinal tract - ventral corticospinal tract - spinal cord |
| The _____________ innervates only as far down as the neck and is involved in __________ . | - tectospinal tract - reflexive turning of the head |
| The lateral and medial _________ tracts control muscles of the _________, and help maintain __________. They also contain __________ pathways. | - reticulospinal - arms and legs - balance and posture - descending analgesic |
| The lateral and medial ________ tracts run from the vestibular nuclei, splits into ipsilateral and contralateral tracts. | - vestibulospinal |
| The lateral vestibulospinal tract passes down the _________ of the spinal cord. | ventral column |
| The lateral vestibulospinal tract facilitates neurons that ____________ . | control extensor muscles of the limbs |
| The lateral vestibulospinal tract is involved in the reflex that responds to ________ and _________. | body tilt, keeping one's balance |
| Does the medial vestibulospinal tract have ipsilateral fibers, contralateral fibers, or both? | Both |
| The medial vestibulospinal tract descends down the ______ column of the spinal cord and terminates in the __________. | ventral, neck |
| The medial vestibulospinal tract plays a role in : | the control of head position. |
| Fasciculus gracilis carries the sensations of: | 1) vibration 2) deep touch 3) discriminative touch 4) proprioception 5) visceral pain |
| Fasciculus cuneatus carries the sensations of: | 1) vibration 2) deep touch 3) discriminative touch 4) proprioception 5) visceral pain |
| What's the only difference between f. cuneatus and f. gracilis? | Fasciculus cuneatus begins at the T6 segment of the spinal cord, whereas fasciculus gracilis runs the entire length. |
| Nucleus cuneatus and nucleus gracilis send out decussating tracts that form the _______ . | medial lemniscus |
| The anterolateral system contains the: | 1) spinothalamic tract 2) spinoreticular tract |
| The spinothalamic tract carries signals for: | 1) temperature 2) itch 3) tickle 4) pain 5) light/crude touch 6) pressure |
| Second order nuclei of the spinothalamic tract are located in the __________ . | dorsal horns of the spinal cord |
| The spinoreticular tract carries signals of _________ . | pain caused by tissue damage |
| Second-order neurons of the spinoreticular tract have their nuclei in the _________ . | dorsal horns of the spinal cord |
| The spinocerebellar tracts can be either __________ or _________ . | - dorsal - ventral |
| Dorsal and ventral spinocerebellar tracts are in the _________ column of the spinal cord. | lateral |
| First-order neurons of the spinocerebellar tracts run from __________ to ________ . | - muscles and tendons - the dorsal horns of the spinal cord |
| The ventral spinocerebellar tract decussates once in the _________ and again in the _______. | - spinal cord - brainstem |
| Upper motor neurons have their soma in the _______. | motor cortex or brainstem |
| Lower motor neurons have their soma in the _______. | brainstem or spinal cord |
| Visceral nerve fibers | innervate blood vessels, glands and viscera |
| somatic nerve fibers | innervate skin, skeletal muscles, bones, and joints |
| special nerve fibers | innervate more localized organs of the head: - eyes, ears, olfactory/taste receptors - muscles of chewing, swallowing, & facial expression |
| Excepting C1, the spinal nerves exit the spinal canal through ________. | intervertebral foramina |
| Each ventral root emerges from the spinal cord as 6 to 8 __________. | rootlets |
First Time Here?
Welcome to Quizlet, a fun, free place to study. Try these flashcards, find others to study, or make your own.