Flashcards in Chapter 14: Nervous System: Spinal Cord and Spinal Nerves Deck (315)
A typical adult spinal cord is approximately ___ of an inch in diameter and ranges between 42 and 45 centimeters (_____ inches) in length.
3/4 of an inch in diameter
16 to 18 inches
The spinal cord extends inferiorly from the ____ of the brain through the vertebral canal and ends at the inferior border of the L1 vertebra.
The tapering inferior end of the spinal cord is called the ______ which marks the official "end" of the spinal cord proper.
Two enlargements are visible in the surface view of the spinal cord because they are ____ than other areas of the cord due to the greater number of neurons that extend from these enlargements to ______ the upper and lower limbs.
The ____ enlargement is an enlarged region of the inferior cervical part of the spinal cord that contains the neurons that innervate the upper limbs.
The ____ enlargement is an enlarged region of the mid-lumbar part of the spinal cord that contains the neurons that innervate the lower limbs.
The spinal cord is subdivided into ___ parts.
Associated with each part of the spinal cord there are the rootlets that form the ____ pairs of spinal nerves.
The ___ part of the spinal cord is the supeiormost part of the spinal cord.
The cervical part contains neurons whose axons contribute to the __ pairs of cervical spinal nerves.
The cervical part is continuous with the ____.
The ___ part lies inferior to the cervical part. It contains the neurons for the ___ pairs of thoracic spinal nerves.
The ____ part is a shorter segment of the spinal cord that contains the neurons for the ____ pairs of lumbar spinal nerves.
The ____ part lies inferior to the lumbar part and contains neurons for the ____ pairs of sacral spinal nerves
The ____ part is the most inferior tip of the spinal cord which has ____ pair of cocygeal spinal nerves arising from this part.
Different parts of he spinal cord do not match up exactly with the vertebrae of the same name due to the fact that the vertebrae growth continued longer than the growth of the spinal cord resulting in the _____.
L2-L5, S1-S5, and Col extend inferiorly from the ____ forming the cauda equina.
The nerve roots of the cauda equina get their name b/c they resemble a ____.
The filum terminale within the cauda equina is a thin strand of ____ that helps anchor the conus medullaris to the ____.
The intervertebral foramina are lateral openings between vertebrae, which provide the passageway for each spinal nerve to extend from the spinal cord and exit the ____.
Each spinal nerve is identified by the first letter of the spinal cord part to which it attaches combines with a ___.
Each side of the spinal cord contains ____ cervical nerves, ____ thoracic nerves, ___ lumbar nerves, ___ sacral nerves, and ___ coccygeal nerve.
8 cervical nerves
12 thoracic nerves
5 lumbar nerves
5 sacral nerves
1 coccygeal nerve
Spinal nerve names are different than cranial nerve names because cranial nerves are designated by ___ followed by a roman numeral.
The spinal cord is roughly ____, but slightly flattened posteriorly and anteriorly.
There are 2 longitudinal depressions: a narrow groove, the posterior _____, dips internally on the posterior surface, and a slightly wider groove, the anterior or ventral _____.
Both the size and shape of the spinal cord changes along its length because the amount of ___ and ____ reflects the function of that part of the spinal cord.
The spinal cord parts that control the upper and lower limbs are larger because more _____ are located there and more space is occupied by ____ and ____.
neuron cell bodies
axons and dendrites
There are 8 pairs of cervical spinal nerves, but only ___ cervical vertebrae.
The atlas is the ___ cervical vertebrae.