Nerve Muscle Physiology

NERVE MUSCLE PHSIOLOGY IMPORTANT POINTS: 1. STRUCTURAL AND FUNCTIONSL UNIT OF CNS IS CALLED NEURON. 2. HUMAN NERVOUS SYSTEM CONTAINS 1012 NEURONS, APPROX.

STRUCTURE OF NEURON: 1. Cell body ribose

contains Nissl’s granules, basophilic granules rich in nucleoprotein. Neurofibrillae.

2. Dendrites / processes. Receptive processes of neuron. 5-7 processes extend from body and arborize; after leaving cell. 3. Axon:

Arises from axon hillock. Cell membrane of axon is called axolemma. CYTOPLASMIC FLUID IS CALLED

AXOPLASM. Covered by a myelin sheath, protein lipid complex, except at nerve endings and at intervals of 1mm apart; Nodes of Ranvier. FUNCTIONS: 1. CELL BODY: Maintains the functional and anatomic integrity of the axon by the formation of neurotrophins. 2. DENDRITES are the receptive processes of the neuron that transmit the impulses towards ths cell body. 3. SYNAPTIC KNOBS: Action potential causes the release of synaptic transmitter. 4. Myelin Sheath: Facilitates Conduction Of Impulses.