Organization of the Spinal Cord

Question 1

which is more prominent: dorsal median sulcus or ventral median fissure?

Answer 1

ventral median fissure

Question 2

C1-7 spinal nerves emerge ________ the corresponding vertebrae, C8 and on emerge ___

Answer 2

c1-7 above

everybody else below

EX: C8 emerges between C7 and T1, T1 emerges below T1

Question 3

C1 and coccygeal spinal nerves have _______ only

Answer 3

ventral root (motor) fibers only

Question 4

where do you do a lumbar puncture?

Answer 4

between LV 4 and 5 (b/c the spinal cord ends b/w LV 2 and 3)

Question 5

dorsal horns contain…

Answer 5

central processes of pseudounipolar neurons whose cell bodies are located in the dorsal root gnaglia

tract cells whose axons form ascending tracts

axon terminals of descending tracts

itnerneurons

Question 6

intermediate zone contains..

Answer 6

interneurons which are local circuitry neurons

Question 7

lateral horns contain..

Answer 7

preganglion sympathetic nerve cell bodies

Question 8

where is the sympathetic chain ?

Answer 8

T1- L2/3 levels

Question 9

what do the ventral horns contain?

Answer 9

motor neurons whose axons innervate skeletal muscle

Question 10

medial –> lateral ventral horn..

Answer 10

corresponds with axial to limb muscles

limbs are more lateral

Question 11

10 layers of neurons in the spinal cord gray matter, each layer forming a longitudinal column

Answer 11

laminae of rexed

Question 12

lamina II =

Answer 12

substantia gleatinosa

Question 13

lamina IV, V, VI =

Answer 13

nucleus proprius

Question 14

lamina IX

Answer 14

contains motor neurons whose axons run in peripheral nerves to innervate skeletal muscle

Question 15

contains the nerurons of the spinothalamic tracts

Answer 15

nucleus proprius

Question 16

contains interneurons which play a role in modulation of nociceptive transmission, preventing it from reaching higher brain centers

Answer 16

substantia gelatinosa

Question 17

intermediolateral cell column corresponds to the

Answer 17

lateral horn

Question 18

column of autonomic neurons in the T and upper L segment s of the spinal cord

Answer 18

intermediolateral cell column

contains the cell bodies of pregangliionic sympathetic neurons

Question 19

origin of the dorsal spinocerebellar tract

Answer 19

nucelus dorsalis (clarkes column)

column of neurons in the T and upper L segments

Question 20

contains cel lbodies of preganglionic parasympathetic neurons

Answer 20

sacral autonomic nucleus

colum of neurons in the mdi-sacral segments

Question 21

more medial fasciculus

Answer 21

gracilis is more medial than the cuneatus

Question 22

relays discriminative fine touch, vibratory sense, position sense and light crude touch sensation from the body

Answer 22

dorsal funiculus

Question 23

lateral corticospinal tract

Answer 23

motor

Question 24

rubrospinal tract

Answer 24

motor

Question 25

dorsal spinocerebellar tract

Answer 25

position sense

Question 26

lateral spinothalamic tract

Answer 26

pain and temperature, touch

Question 27

ventral spinocerebellar tract

Answer 27

position sense

Question 28

anterior corticospinal tract

Answer 28

motor

Question 29

dorsolateral tract of lissauer

Answer 29

consists of central processes of snesory unipolar neurons relaying pain and temperature sensation from the body

Question 30

most white matter found in ______ region

Answer 30

cervical, least is found in lumbosacral region

Question 31

FC present at _______ spinal cord levels. FG present at ________ spinal cord levels.

Answer 31

FC- C1-T6

FG- ALL

Question 32

clarkes nucleus is present at what spinal levels

Answer 32

C8-L2

Question 33

arises from nucleus proprius, crosses to opposite side ans ascends in ventrolateral funiculus

Answer 33

spinothalamic tract

Question 34

an injury involving T12 and L1 vertebrae will damage

Answer 34

motor neurons AND parasympathetic neurons