Nervous Tissue 1: Neurons And Thier Classification Flashcards
1
Q
Origin of Most Nervous tissue
A
Ectoderm
2
Q
Size of cell body of neurones
A
4micrometers to 100micrometers
3
Q
Describe Nucleus of cell body of Neurones
A
- Large
- Spherical
- Pale
- Euchromatic
- Prominent nucleolus
4
Q
Describe Organelles of cell body of Neurones
A
- Highly developed rER & free ribosomes that make up Nissel Bodies
- Perinuclear golgi apperatus
- scattered Mitochondria
5
Q
Describe exoskeleton of cell body of Neurones
A
- Neurofilaments (10nm in diameter) bundle together to form neurofibrils (2micrometers diameter) provide support
- No centrioles
- Microtubules (20-28nm in diamter) involved in axonal transport
6
Q
Stain used for neurofilaments
A
Silver (Ag)
7
Q
Describe inclusions of cell body of Neurones
A
- Lipofusin pigment (golden brown)
- Melanin pigment (black)
- Glycogen and lipid droplets
8
Q
Compare between dendrites and axons
A
- Both have mitochondria, neurotubules & neurofilaments
- dendrites are numerous Axon is single
- Dendrites are thicker Axon is thinner
- Dendrites are shorter Axon is **long **
- Dendrite is branching with acute angle between each branch, Axon doesnt branch but forms right angle with collateral branch
- Dendrites **subdivide **into thinner branches, Axon has constant diameter throughout
- Dendrite contains Nissel bodies, Axon doesnt
9
Q
Site of Unipolar Neurones
A
- DRG (spinal ganglia)
- Mesencephalic Nucleus of trigemnal Nerve
10
Q
Site of Bipolar Neurones
A
(ear, eye, nose)
* Cochlear & vestibular ganglia of ear
* Retina of the eye
* Olfactory mucosa of the nose
11
Q
Site of Multipolar Neurones
A
- Stellate: Anterior horn cells & sympathetic ganglion
- Pyramidal cells in cerebral cortex
- Pyriform: purkinje cells in cerebellar cortex
12
Q
Golgi type 1 Neuornes have —– Axons that —— grey matter & enter ——
A
long, leave, white matter
13
Q
golgi type 2 neuornes —–
A
Never leave grey matter
