L17: Spinal Column

Question 1

3 major subdivisions of a typical somite

Answer 1

endoderm
mesoderm
ectoderm

Question 2

define dermatome

Answer 2

area of skin supplied w/ afferent fibers by a single posterior spinal root

Question 3

define myotome

Answer 3

all the muscles that are innervated by a single efferent anterior root

Question 4

most muscles are composed of more than one _____.

Answer 4

myotome

Question 5

somite cells that migrate anteriorly

Answer 5

becomes muscles of limbs and trunk = hyaxial muscles

and the associated dermis

Question 6

somite cells that migrate posteriorly

Answer 6

becomes intrinsic muscles of the back = epaxial muscles

and the associated dermis

Question 7

conus medullaris ends at

Answer 7

L2

Question 8

cauda equina

Answer 8

horse tail ending of the spinal cord

Question 9

filum terminale

Answer 9

thin filament of meningeal tissue

Question 10

number of spinal nerves per portion of vertebral column

Answer 10

8 cervical
12 thoracic
5 lumbar
5 sacral
1 coccygeal

Question 11

spinal level of plexuses

Answer 11

cervical C1-4
brachial C5-T1
lumbosacral L1-S4

Question 12

posterior horns are made of ____ matter and receive incoming _____ fibers.

Answer 12

gray matter

sensory fibers

Question 13

anterior horns are made of _____ matter and are the site of ?

Answer 13

gray matter

cell bodies of alpha motor neurons to skeletal muscle

Question 14

lateral horns are made of _____ matter and only exist where? made up of ?

Answer 14

gray matter

thoracic and upper lumbar

cell bodies of autonomic neurons

Question 15

spinal cord horns are made of

Answer 15

gray matter

Question 16

spinal cord columns are made of

Answer 16

white matter

Question 17

funiculi

Answer 17

columns

Question 18

describe columns of spinal cord

Answer 18

white matter
myelinated tracts
posterior, anterior and lateral columns

Question 19

dorsal roots carry

Answer 19

afferent fibers

Question 20

dorsal root ganglion are the site of ?

Answer 20

cell bodies of afferent neurons

Question 21

ventral roots carry

Answer 21

efferent fibers

Question 22

ventral have ____ associated ganglion

Answer 22

no

Question 23

spinal nerves carry ____ fibers

Answer 23

mixture of both efferent and afferent

Question 24

primary dorsal rami to

Answer 24

epaxial muscles

skin on either side of spinal column

Question 25

primary ventral rami to

Answer 25

hypaxial muscles rest of skin not innervated by dorsal rami

Question 26

white ramus communicans carry ?

Answer 26

pre-ganglionic sympathetic fibers from lateral horns

Question 27

gray ramus communicans carry?

Answer 27

post-ganglionic sympathetic fibers from paravertebral ganglia back to spinal nerve

Question 28

tough outer layer of spinal cord

Answer 28

dura mater

Question 29

spinal cord space the contains CSF

Answer 29

subarachnoid space

Question 30

delicate innermost layer of spinal cord

Answer 30

pia mater

Question 31

ligaments that support the spinal cord and are attached to pia mater

Answer 31

denticulate ligaments

Question 32

meningeal coverings and spaces in order

Answer 32

``` epidural space dura mater subdural space arachnoid subarachnoid space pia mater denticulate lig. ```