Nervous tissue

Question 1

Slide 14 start:

Oligodendrocytes

Dendritic cells

Answer 1

Cells that has a few processes extending from cell. Form myelin sheaths.

Dendritic cells = processes extending from cell. (oligo = few)

Question 2

Astrocytes

Answer 2

Most abundant glial cells in CNS. Help form BBB.

Fibrous astrocytes: more abundant in white matter

protoplasmic astrocytes: more abundant in gray matter

Question 3

Ependymal cells

Answer 3

secrete, circulate, reabsorb cerebrospinal fluid

line ventricles of brain and central canal of spinal cord

Question 4

Microglia

Answer 4

same origin and function as macrophages.

are phagocytic anti-microbial cells of the CNS

Question 5

Schwann cells

Answer 5

do not have processes like oligodendrocytes. Each shwann cell is limited to one axon. (myelination)

Found only in the PNS.

Question 6

Satellite cells of ganglia

Answer 6

support, insulate, nourish ganglion cells.

Question 7

brain is composed of:

brainstem is composed of:

Answer 7

cerebrum
diencephalon
midbrain / pons / medulla oblongata : brainstem

cerebellum

Question 8

spinal cord comprised of: ____ region, giving rise to ___ pairs of ____ nerves

Answer 8

• a cervical region, giving rise to 8 pairs of cervical nerves (C1-8)
• a thoracic region, giving rise to 12 pairs of thoracic nerves (T 1-12)
• a lumbar region, giving rise to 5 pairs of lumbar nerves (L 1-5)
• a sacral region, giving rise to 5 pairs of sacral nerves (S 1-5)
• a coccygeal region, giving rise to 1 pair of coccygeal nerves (Coc 1)

Question 9

connective tissue sheaths

Answer 9

Endoneurium: Surrounds individual nerve fiberss
Perineurium: Surrounds fascicles (bundles)
Epineurium: Layer CT surrounds entire nerve