Segmental Organization of Spinal Cord

Question 1

Preganglionic sympathetic neurons are at levels:

Answer 1

T1-L2, S2-S4

Question 2

Myotome level of upper limb:
Shoulder muscles
Hand muscles

Answer 2

C5/6

C8/T1

Question 3

Myotome level of lower limb:
Hip muscles
Foot muscles

Answer 3

L2/L3

S2

Question 4

Myotome level of diaphragm

Answer 4

C3-5

Question 5

Myotome level of pelvic diaphragm/perineum

Answer 5

S2/3/4

Question 6

Myotome innervation of elbow flexion

Answer 6

C5, C6

Question 7

Myotome innervation of elbow extension

Answer 7

C7, C8

Question 8

Myotome innervation of knee extension

Answer 8

L3, L4

Question 9

Myotome innervation of angle plantar flexion

Answer 9

S1, S2

Question 10

Dermatome innervation of fingertips

Answer 10

C6-8

Question 11

Dermatome innervation of nipple

Answer 11

T4

Question 12

Dermatome innervation of umbilicus

Answer 12

T10

Question 13

Dermatome innervation of toes

Answer 13

L5-S1

Question 14

Lamina 1 =

Answer 14

Posteromarginal nucleus

Question 15

Lamina 2 =

Answer 15

Substantia gelatinosa

Question 16

Lamina 3-5 =

Answer 16

Nucleus proprius

Question 17

Lamina 5-6 =

Answer 17

Basal nucleus/base of dorsal horn

Question 18

Lamina 7 =

Answer 18

Intermediate zone

Question 19

Lamina 8 =

Answer 19

Reticular core of ventral horn

Question 20

Lamina 9 =

Answer 20

LMN groups

Question 21

Lamina 10 =

Answer 21

Central gray

Question 22

Spinothalamic neurons are present in only ____ laminae

Answer 22

1, 4, 5, 6

Question 23

Dorsal nucleus of Clarke (Nucleus dorsalis) at levels ___ located in lamina ____

Answer 23

C8-L3

7, Intermediate zone

Question 24

Medial group neurons of the ventral horn innervate ___

Answer 24

Trunk muscles

Question 25

Lateral group neurons of the ventral horn innervate ___

Answer 25

Limb muscles

Question 26

Spinal accessory nucleus At levels ___ Origin of the ____ nerve Function:

Answer 26

Independent motor nuclei in the ventral horn C1-C5 Spinal accessory nerve (CN11) Somatomotor control of trapezius and SCM mm.

Question 27

Phrenic nucleus At levels ___ Origin of the ____ nerve Function:

Answer 27

Independent motor nuclei in the ventral horn C3-C5 Phrenic neve Somatomotor control of diaphragm

Question 28

Onuf's nucleus At levels ___ Origin of the ____ nerve Function:

Answer 28

Independent motor nuclei in the ventral horn S1-S4 Pudendal nerve Somatomotor control of external voluntary urethral and anal sphincter

Question 29

Spinal cord neuron columns found on all levels (3) | Responsible for ____

Answer 29

Nucleus proprius Substantia gelatinosa Posteromarginal nucleus Sending pain and temperature from every level of skin and viscera

Question 30

Clarke's nucleus are at levels:

Answer 30

C8-L3

Question 31

IML are at levels:

Answer 31

T1-L2

Question 32

Lateral group LMN are at levels: | Contain:

Answer 32

C4-T1, L2-S2 | Motor neurons going to limbs

Question 33

Motor and descending pathways (6)

Answer 33

``` Lateral/anterior coritcospinal tract Rubrospinal tract Reticulospinal tract Olivospinal tract Vestibulospinal tract ```

Question 34

Sensory and ascending pathways

Answer 34

``` Dorsal column medial lemniscus system Spinocerebellar tracts (posterior/anterior) Spinothalamic tracts (lateral/anterior) Spino-olivary fibers ```