nervous tissue i

Ne uro n sNe uro n s

Neural tissue consistsNeural tissue consists of:of:

n e uro n sn e uro n s and and glialglial ce llsce lls

GlialGlial Ce llCe ll

MAIN TYPES OF NEURONES, ACCORDONG TO THE MORPHOLOGY:

UNIPOLAR

BIPOLAR

MULTIPOLAR

PSEUDOUNIPOLAR

PSEUDOUNIPOLAR NEURONES

Pseudounipolar neurones(perikaryon)

Peripheral nerve fibers

76. Spinal ganglion, HE. (low power magnification)

PSEUDOUNIPOLAR NEURONES

76. Spinal ganglion, HE. (high power magnification)

Pseudounipolar neurones-perikaryon(nucleus, nucleolus)

Axon

Peripheral nerve fibers

Satellite cell nucleus

Schwann cell nucleus

A-cellD-cell

MULTIPOLAR NEURONES I.

79. Autonomic ganglion, Silver-impregnation

Perikaryon

Nerve fibers

Central canal

Ventral horn(Deiters motoneurones)

Segmet

MULTIPOLAR NEURONES IIa.Deiters motoneurones

Central canal

White matter

Gray matter

Ventral horn(Deiters motoneurones)

80. Spinal cord, HE (low power magnification)

MULTIPOLAR NEURONES IIb.Deiters motoneurones

80. Spinal cord, HE (medium power magnification)

Multipolarneurones

White matter

Ventral horn

MULTIPOLAR NEURONES IIc.Deiters motoneurones

Multipolarneurone

Glial cellnucleus

Capillary

80. Spinal cord, HE (high power magnification)

MULTIPOLAR NEURONES IId.Deiters motoneurones

80. Spinal cord, HE (high power magnification)

Multipolarneurone

Nucleus

Nucleolus

Glial cellnucleus

Capillary

80. Spinal cord, HE (high power magnification)

MULTIPOLAR NEURONES IIe.Deiters motoneurones

Multipolarneurone

Glial cellnucleus

Nucleus

NucleolusNissl-substance

NEUROGLIA

GLIA CELLSIN THE PNS

GLIA CELLSIN THE CNS

- Schwann cell

- Satellite cell

- Oligodendrocytes

- Microglia

- Astrocyte

- Ependyma

Myelin formation in nerve fibers:

Schwann-cell(PNS)

Oligodendrocyte(CNS)

PERIPHERAL NERVE IN TRANSVERSE SECTION

PERIPHERAL NERVE IN TRANSVERSE SECTION

ParaneuriumEpineurium

Perineurium

EndoneuriumAdipose tissue

Artery, Vein

PERIPHERAL NERVE IN TRANSVERSE SECTION72. Peripheral nerve, HE. (low power magnification)

Axon

Myelin sheath

Perineurium

Schwann-cellnucleus

Nucleus of fibrocyte

PERIPHERAL NERVE IN LONGITUDINAL SECTION

SCHMIDT- LANTERMANN CLEFTS

PERIPHERAL NERVE IN LONGITUDINAL SECTION73. Peripheral nerve, HE.

Axon

Schwann cellnucleus

Nucleus of fibrocyte

Node of Ranvier

PERIPHERAL NERVE IN LONGITUDINAL SECTION73. Peripheral nerve, HE.

Nodes of Ranvier

Schwann cellnucleus

Pseudounipolar neurons

Satellite cell nucleus

Schwann cell nucleus

GLIA CELLS IN THE PNS

GlialGlial ce llsce lls inin thethe CNSCNS are m adeare m ade o f o f as tro cyte sas tro cyte s , , o ligo de n dro cyte so ligo de n dro cyte s , ,

e pe n dym ale pe n dym al ce lls , an d ce lls , an d m icro glialm icro glialce lls .ce lls .

Main functions of the astrocytes:

-structural support

-repair processes

-blood-brain barrier

-metabolic exchanges

- scar-making cells

86. Astrocytes, GFAP

ASTROCYTES

Perivascularlimiting membrane

Astrocytes

Capillary