Organization of the spinal cord Flashcards Preview

Year 1 Neuroanatomy > Organization of the spinal cord > Flashcards

Flashcards in Organization of the spinal cord Deck (15):
1

what is contained in the dorsal horns of the gray matter?

1. central processes of pseudounipolar neurons whose cell bodies are located in the DRG 2. tract cells whose axons form ascending tracts 3. axon terminals of descending tracts 4. interneurons

2

what is contained in the lateral horns of the gray matter?

preganglionic sympathetic nerve cell bodies

3

what is contained in the ventral horns of the gray matter?

1. motor neurons whose axons innervate skeletal muscle 2. medial region contains motor neurons that innervate axial muscles 3. lateral region contains motor neurons that innervate limb muscles

4

what is contained in lamina 2 (substantia gelatinosa)?

interneurons which play a role in the modulation of nociceptive transmission - filters information to prevent it from reaching higher brain centers and conscious awareness

5

what is contained in laminae 4, 5, 6 (nucleus proprius)?

neurons of the spinothalamic tract

6

what is contained in lamina 9?

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

7

what is contained in the intermediolateral cell column?

autonomic neurons in the T and upper L segments of the spinal cord; cell bodies of preganglionic sympathetic neurons

8

what is contained in the nucleus dorsalis (Clarke's column)?

column of neurons in the T and upper L segments; origin of the dorsal spinocerebellar tract (C8-L2)

9

what is contained in the sacral autonomic nucleus?

column of neurons in the mid-sacral segments; contains cell bodies of preganglionic parasympathetic neurons

10

what is the function of the dorsal funiculus?

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

11

what are the components and functions of the lateral funiculus?

1. lateral corticospinal tract - motor 2. rubrospinal tract - motor 3. dorsal spinocerebellar tract - position 4. lateral spinothalamic tract - pain, temperature, touch 5. ventral spinocerebellar tract - position

12

what is the function of the ventral funiculus?

anterior corticospinal tract - motor

13

where is the dorsolateral tract of Lissauer? what is its function?

1. between dorsal horn and spinal cord surface 2. consists of central processes of sensory unipolar neurons relaying pain and temperature sensation from the body

14

at what spinal cord level is the most white matter seen? least?

1. most - cervical 2. least - lumbosacral

15

where does the spinothalamic tract arise? where does it go?

1. arises from nucleus proprius (laminae 4, 5, 6) 2. crosses to opposite side and ascends in ventrolateral funiculus