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)
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1
Q

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

A
  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
Q

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

A

preganglionic sympathetic nerve cell bodies

3
Q

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

A
  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
Q

what is contained in lamina 2 (substantia gelatinosa)?

A

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
Q

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

A

neurons of the spinothalamic tract

6
Q

what is contained in lamina 9?

A

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

7
Q

what is contained in the intermediolateral cell column?

A

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

8
Q

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

A

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

9
Q

what is contained in the sacral autonomic nucleus?

A

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

10
Q

what is the function of the dorsal funiculus?

A

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

11
Q

what are the components and functions of the lateral funiculus?

A
  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
Q

what is the function of the ventral funiculus?

A

anterior corticospinal tract - motor

13
Q

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

A
  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
Q

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

A
  1. most - cervical 2. least - lumbosacral
15
Q

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

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