Class Notes (807,845)
United States (312,848)
BMS 301 (47)

External anatomy of spinal cord, internal anatomy, meninges

4 Pages
Unlock Document

Colorado State University
Biomedical Science
BMS 301
Mark Frasier

17 September External Anatomy of Spinal Cord Segmented A segment is that portion of the spinal cord that gives rise to the roots that will form a bilateral pair of spinal nerves 31 pair, therefore 31 segments Ends at bony level L2 Two enlarged areas Cervical enlargement – corresponds to upper limb Lumbar enlargement – corresponds to lower limb In fetal life, goes down to level of S2 About equals growth of bony column th th 7 – 8 month of in utero development Slows growth Growth of bony column speeds up Differential growth rate Cord tapers to an end – conus medularis From L2 – S2 – cauda equine Collection of spinal nerve roots; but not spinal cord Segments 8 cervical 12 thoracic 5 lumbar 5 sacral 1 – 3 coccyxael Enlargements are more prone to damage Rule of 1’s Bony level C1 = cord level C1 Bony level T1 = cord level T1 Bony level T11 = cord level L1 Bony level L1 = cord level S1 To see which part of cord will be affected given injury at certain bony level Internal Anatomy Not segmented Long continuous columns of white and gray matter Gray matter = neuronal cell bodies White matter = myelinated nerve cell processes (axons + dendrites) Central butterfly shape (cross section) – gray matter Dorsal gray made of cell bodies of connector neurons Ventral gray – alpha motor neurons (lower motor neurons, final common pathway). On
More Less

Related notes for BMS 301

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.