physiology

Si plified

BY….Dr.M7md El-Bshany

• Neuron.• Reflex Action.• Central Nervous System.• peripheral Nervous System.

Objectives

Neuron

Def.

structure

Structural unit of nervous system

Cell body (soma). Processes.

Axon DendritesDef Single longer process Multiple short

processes

Function Conduction of impulse Collect impulseTransmit to cell body↑Surface area

Direction Away from Towards

Types

NeuronAfferent(sensory) Carrry impulse from Receptor to CNS.

Efferent(Motor) Carrry impulse from CNS to Effector.

Inter-neurons(Associative)

Represent 99% of neurons. Locatted entirely in CNS. Relay message between neurons. Act as associative or integrative funtions of CNS.

Axon Terinal

Neuron Neuro-neural junction

Muscle Neuro-muscular junction

Gland Nuero-epithelial junction

Reflex ActionDef. Functional unit of nervous system.

Involuntry response of part of body to stimulus of sensory receptor.

Pathway

Types

Somatic flection withdrawl reflex. Autonomic Micturation &defecation rflexes.

Central Nervous SystemCerebum

Mid-brain

Medulla oblongata

Pons

Cerebellum

Peripheral Nervous System

Anatomical classification

physiological classification

Cranial nerves.(12 pairs)

Spinal nerves.(31 Pairs)

Somatic nerves. Autonomic nerves.

Centre

So, whats difference ()somatic &autonomic NS?

Efferent