Lectures

Rexed Laminae and Spinal Cord Tracts

by Craig Canby, PhD
(1)

Questions about the lecture
My Notes
  • Required.
Save Cancel
    Learning Material 2
    • PDF
      Slides 3 SpinalCord1 BrainAndNervousSystem.pdf
    • PDF
      Download Lecture Overview
    Report mistake
    Transcript
    Now, I want you to understand the fact that the gray matter is divided into finer divisions. We looked at dorsal, ventral, and intermediate horns. But the gray matter is divided into divisions that are referred to as Rexed laminae. These are going to number I through X. I will be located most dorsally. IX is located out here ventrally. Then X is going to be in an area of decussation of axons. Now, I want you to understand some of the basic functions that are associated with these Rexed laminae. First, we’re going to bundle Rexed laminae I through IV together. You can see where they’re located within the dorsal gray horn or dorsal horn. These are responsible for exteroceptive sensations. Here you’re receiving information from the periphery of the body as it might relate to fine touch, temperature, vibration, or pressure. Rexed laminae V and VI shown here and here are responsible for proprioceptive sensation. These also serve as a relay between the midbrain and the cerebellum. Rexed lamina number VI also will have some neurons that will give rise to the spinocerebellar pathways. This will be ascending in nature. Number VII shown in through here would only be found where you have visceral motor output, sympathetic motor output. So you’re looking at this particular lamina being found in spinal cord segments T1 through T12, L1, L2 and perhaps L3. VIII and IX are shown here and here. These Rexed laminae are responsible for final motor output to the periphery. Then lastly, between the right and left gray horns, you have this more centrally located area where you have a decussation of axons between the right and left sides. If we highlight specifically Rexed lamina number IX, again this is coordinating final motor output along with VIII but...

    About the Lecture

    The lecture Rexed Laminae and Spinal Cord Tracts by Craig Canby, PhD is from the course Spinal Cord. It contains the following chapters:

    • Rexed Laminae
    • Spinal Cord Tracts

    Included Quiz Questions

    1. Rexed Laminae I—IV are located in the dorsal column.
    2. Rexed Laminae X is located in area of decussation of neurons.
    3. Rexed Laminae VIII—IX are located in the ventral horn.
    4. Rexed Laminae I—IV are located in the dorsal horn.
    5. Rexed Laminae I is located most dorsally and Rexed Laminae IX is located most ventrally.
    1. X----->Relay between midbrain and cerebellum
    2. V—VI----->Proprioception
    3. I—IV -----> Fine touch, temperature and vibration
    4. VII-----> Visceral motor output
    5. VIII—IX-----> Final motor output
    1. Innervation to proximal muscles of upper limbs arise from the more medial aspect.
    2. Flexors of the upper limb are oriented more anteriorly.
    3. Innervation to distal muscles of upper limbs arise from the more medial aspect.
    4. Innervation to proximal muscles of upper limbs arise from the more lateral aspect.
    5. Extensors of the upper limb are oriented more posteriorly.
    1. T1—T12 & L1—L2
    2. T1—T4 & L1—L2
    3. T1—T8 & C1—C5
    4. L1—L5 & S1—S4
    5. C1—C7 & T1—T12

    Author of lecture Rexed Laminae and Spinal Cord Tracts

     Craig Canby, PhD

    Craig Canby, PhD


    Customer reviews

    (1)
    5,0 of 5 stars
    5 Stars
    5
    4 Stars
    0
    3 Stars
    0
    2 Stars
    0
    1  Star
    0