Exam 2 Spinal cord interior

Question 1

What are collections of axons grouped together in the CNS called?

Answer 1

Tracts

Question 2

Afferent tracts are usually____ & efferent tracts are _____?

Answer 2

Sensory & Motor

Question 3

What is the main sensory pyramidal tract called & pass through what?

Answer 3

Dorsal column passing through the Medial Lemniscus system

Question 4

Pain sensory signals are sent through what system?

Answer 4

Spinothalamic (Anterolateral) system

Question 5

The spinocerebellar tracts send what kind of signal to where?

Answer 5

Signals about movement & body position to the cerebellum

Question 6

What are the 3 afferent pyramidal tracts called?

Answer 6

Dorsal column Medial Lemniscus system, Spinocerebellar tracts, & Spinothalamic (Anterolateral System)

Question 7

Sensory information enters the _____ part of the spinal cord & motor exits through the____.

Answer 7

Dorsal & anterior

Question 8

The Spinal nerve becomes the spinal ____, which then become the _____, which enter the spinal cord.

Answer 8

Root & rootlets

Question 9

Lamina 1 is in the ____ area of the spinal cord and transmits what kind of signal?

Answer 9

Dorsal & fast/sharp pain

Question 10

A-Delta neurons send what kind of signal?

Answer 10

Fast/sharp pain

Question 11

What is a nickname for Lamina 1?

Answer 11

Lamina Marginalis

Question 12

Slow pain is sent through what Laminae?

Answer 12

Laminae 2, 3, & 5

Question 13

What is another name for Laminae 2 & 3?

Answer 13

Substantia Gelatinosa

Question 14

Slow pain is sent through what kind of fibers?

Answer 14

C-fibers

Question 15

Which Laminae receive sensory input such as pressure, stretch, position?

Answer 15

Laminae 1 thru 6

Question 16

Where is Lamina 8 located & what is its function?

Answer 16

In the anterior horn send information for muscles to contract

Question 17

What signals are sent through the DCML?

Answer 17

High fidelity like finger pressure, vibrations

Question 18

Do signals entering the DCML cross over?

Answer 18

Yes, but no as they enter the spinal cord. They cross over at the Lower Medulla Oblongata

Question 19

The DCML is divided into what to parts?

Answer 19

Fasciculus gracilis & Fasciculus cuneatus

Question 20

The Fasciculus cuneatus sends _____ extremity info & the Fasciculus gracilis send _____extremity info.

Answer 20

Upper & lower

Question 21

Where is the crossover for the DCML pathway?

Answer 21

The Lower medulla oblongata

Question 22

Where is the Medial Lemniscus located?

Answer 22

In the PONS

Question 23

Which 2 body parts take up most space in the Homunculus diagram?

Answer 23

Facial & hands

Question 24

Delineate a lower body sensory DCML pathway.

Answer 24

Sensory enters the Fasciculus gracilis then ascends on same side it entered, then crosses over at the medulla oblongata, then travels the Medial Lemniscus pathway to the thalamus.