Anaxonic neuron

An anaxonic neuron is a type of neuron where there is no axon or it cannot be differentiated from the dendrites.[1] Being loyal to the etymology of anaxonic there are two types of anaxonic neurons in the human nervous system, the undifferentiated anaxonic neuron where the axon cannot be differentiated from the dendrites, and the unipolar brush cell (UBC), that has no axon and only a dendritic arbour.[2]

## Contents

* 1 Location
* 2 Function
* 3 See also
* 4 References

## Location

They are found in the brain and retina, in the latter location it is found as the amacrine cell and retina horizontal cells.[2] They are also found in invertebrates.[3]

## Function

They act as non-spiking interneurons.[2][4]

## See also

* Interneuron
* Unipolar neuron
* Pseudounipolar neuron
* Bipolar neuron
* Multipolar neuron

## References

1. ↑ Al, Martini, Frederic Et (2005). Anatomy and Physiology' 2007 Ed.2007 Edition. Rex Bookstore, Inc.. pp. 288–. ISBN 978-971-23-4807-5. https://books.google.com/books?id=joJb82gVsLoC&pg=PA288.
2. ↑ 2.0 2.1 2.2 Saladin, Kenneth S. (2005). Human Anatomy. Charlesbourg, Québec: Rex Bookstore, Inc. (Braille Jymico Incorporated). pp. 370. ISBN 9780071259712. OCLC 1011699773. https://books.google.com/books?id=IlhcbudJ528C&dq=Amacrine cells&pg=PP370.
3. ↑ Pannese, Ennio (1994). Neurocytology: Fine Structure of Neurons, Nerve Processes, and Neuroglial Cells. Thieme. pp. 21. ISBN 978-3-13-781801-4. https://books.google.com/books?id=AS8AkTDEctEC&pg=PA21.
4. ↑ Takahata, M; Nagayama, T; Hisada, M (Dec 7, 1981). "Physiological and morphological characterization of anaxonic non-spiking interneurons in the crayfish motor control system.". Brain Research 226 (1–2): 309–14. doi:10.1016/0006-8993(81)91104-5. PMID 7296293.

* v
* t
* e

Nervous tissue

CNS|

| Tissue Types|

* Grey matter
* White matter
* Projection fibers
* Association fiber
* Commissural fiber
* Lemniscus
* Nerve tract
* Decussation
* Neuropil
* Meninges

|

Cell Types|

| Neuronal|

* Pyramidal
* Purkinje
* Granule
* Spindle
* Interneuron

|

Glial|

| insulating:|

* Myelination: Oligodendrocyte

|

other|

* Astrocyte
* Ependymal cells
* Tanycyte
* Microglia

PNS|

| General|

* Dorsal
* Root
* Ganglion
* Ramus
* Ventral
* Root
* Ramus
* Ramus communicans
* Gray
* White
* Autonomic ganglion (Preganglionic nerve fibers
* Postganglionic nerve fibers)
* Nerve fascicle
* Funiculus

|

Connective tissues|

* Epineurium
* Perineurium
* Endoneurium

Neuroglia|

* Myelination: Schwann cell
* Neurilemma
* Myelin incisure
* Node of Ranvier
* Internodal segment
* Satellite glial cell

Neurons/
nerve fibers|

| Parts|

| Soma|

* Axon hillock

|

Axon|

* Telodendron
* Axon terminals
* Axoplasm
* Axolemma
* Neurofibril/neurofilament

Dendrite|

*     * Nissl body
* Dendritic spine
* Apical dendrite/Basal dendrite

Types|

* Bipolar
* Unipolar
* Pseudounipolar
* Multipolar
* Interneuron
* Renshaw

Afferent nerve fiber/
Sensory neuron|

* GSA
* GVA
* SSA
* SVA
* fibers
* Ia or Aα
* Ib or Golgi or Aα
* II or Aβ and Aγ
* III or Aδ or fast pain
* IV or C or slow pain

Efferent nerve fiber/
Motor neuron|

* GSE
* GVE
* SVE
* Upper motor neuron
* Lower motor neuron
* α motorneuron
* β motorneuron
* γ motorneuron

Termination|

| Synapse|

* Electrical synapse/Gap junction
* Chemical synapse
* Synaptic vesicle
* Active zone
* Postsynaptic density
* Autapse
* Ribbon synapse
* Neuromuscular junction

|

Sensory receptors|

* Meissner's corpuscle
* Merkel nerve ending
* Pacinian corpuscle
* Ruffini ending
* Muscle spindle
* Free nerve ending
* Nociceptor
* Olfactory receptor neuron
* Photoreceptor cell
* Hair cell
* Taste bud

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