Spinal Segments

Question 1

How may segments are there in the spinal cord

Answer 1

31 segments (8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal)

Question 2

Every segment receives dorsal and ventral root filaments EXCEPT

Answer 2

1 cervical and coccygeal segment

Question 3

Largest spinal cord segment

Answer 3

Cervical segments

Question 4

2 major pathways of the dorsal funiculus found on each side

Answer 4

Fasciculus gracilis and fasciculus cuneatus

Question 5

IML is present in all of these segments and contains preganglionic SYMPATHETIC neurons. Also contains dorsal nucleus of Clarke

Answer 5

Thoracic segments

Question 6

Rostral levels of thoracic cord

Answer 6

T1-T6

Question 7

Caudal levels of thoracic cord

Answer 7

T7-T12

Question 8

What dorsal funiculus pathways are found in rostral thoracic segments

Answer 8

Both (gracilis, cuneatus)

Question 9

What dorsal funiculus is found at caudal segments of thoracic cord

Answer 9

Only gracilis

Question 10

Spinal nerves emerging from rostral thoracic cord (EXCEPT T1) innervate

Answer 10

Axial muscles (back and intercostal muscles)

Question 11

Spinal nerves emerging from caudal thoracic levels innervate

Answer 11

Axial muscles and abdominal muscles

Question 12

Lumbar segments that contain IML and sympathetic preganglionic neurons

Answer 12

L1-L2

Question 13

Lumbar segments that do not contain IML

Answer 13

L3-L5

Question 14

Sacral segments that contain IML with PARASYMPATHETIC preganglionic neurons

Answer 14

S2-S4

Question 15

Area of skin supplied by right and left dorsal roots of a single spinal segment

Answer 15

Dermatome

Question 16

How many adjacent dorsal roots have to be sectioned to lose sensation in one dermatome

Answer 16

3