Nervous Tissue I

Question 1

What are the characteristics of the dendrites?

Answer 1

Contains Nissl substance and other organelles but no Golgi.

Question 2

What are characteristics of the cell body?

Answer 2

Contains Nissl bodies and all other organelles

Question 3

What is a characteristic of the axon hillock?

Answer 3

No Nissl substance, where action potential is generated.

Question 4

What are characteristics of the axon?

Answer 4

Only has mitochondria and microtubules.

Question 5

What are the different classifications of neurons?

Answer 5

Sensory (afferent) send signals to the CNS

Motor (efferent) send signal out to glands and muscles.

Somatic- skeletal muscle
Autonomic- glands, cardiac and smooth muscle.

Interneurons-relay info between sensory and motor

Question 6

How are dendrites classified?

Answer 6

Multipolar neurons- single axon and multiple dendrites.

Bipolar- single axon with dendrites at both ends. Found in eyE and olfactory

Pseudounipolar- single axon and dendrites bifurcated into 2 (central and peripheral). Found in dorsal root ganglia.

Question 7

What are the classifications for the length of an axon?

Answer 7

Golgi I- long axon

Golgi II- short axon

Question 8

What is the corrects terminology used for organization of axons and dendrites?

Answer 8

Nerve- bundle of axons in the PNS
Tract- bundle of axons in the CNS
Ganglion- aggregation of cell bodies and dendrites in the PNS
Nucleus- aggregation of cell bodies and dendrites in the CNS

Question 9

What is the micro architecture of a nerve?

Answer 9

Epineurium- covers the nerve

Perineurium- dense connective tissue that covers each bundle of axons. Epithelial like fibroblasts joined by zona occludens.

Endoneurium- thin layer of connective tissue surrounding an axon and schwann cells. Contains receptors, ligand channels, ion channels, and voltage gated channels

Question 10

Name the parts of a neuron?

Answer 10

Dendrites
Cell body
Axon hillock 
Axon
Telodendrites