synapse
DESCRIPTION
histo notesTRANSCRIPT
SYNAPSE
SYNAPSE
“ FASTEN TOGATHER” APPOSITION SITE between TWO
NEUORONS or A NEUORON & ANOTHER CELL (EFFECTOR)
UNIDIRECTIONAL ELECTRICAL SIGNAL (PRESYNAPTIC)-----
CHEMICAL (POST SYNAPTIC)
CLASSIFICATION ANATOMICAL NEURON & NEURON
AXODENDRITICAXOSOMATICAXOAXONICDENDRODNDRITIC
CHEMICALEXCITATORY acetylcholine glutamin serotininINHIBITORY GABA glycine
ELECTRICAL
STRUCTURE
PRESYNAPTIC POST SYNAPTICSYNAPTIC CLEFT
PRESYNAPTIC
BOUTON TERMINAL ACTIVE ZONE
AREA OF SYNAPSE WHERE NEUROTRANSMISSION TAKES PLACE
SUBMEMBRANE DENSITIES SYNAPTIC VESICLES MITOCHONDRIA SMOOTH ER
SYNAPTIC CLEFT
20 –30nmMACROMOLECULES EXTRACELLULAR ENDS OF TRANS MEMBRANE PROTEINSEXTRACELLULAR MATRIX MOLECULES
POST SYNAPTIC
POST SYNAPTIC DENSITYRECEPTOR WITH AFFINITY FOR NEUROTRANSMITTERSACTIN & ACTIN BINDING PROTEINSENZYMES
SYNAPTIC TRANSMISSION PRESYNAPTIC
DEPOLARIZATION Ca GATED CHANNEL INFLUX OF Ca FUSION OF SYNAPTIC VESICLE TO PRESYAPTIC DENSITY EXOCYTOSIS OF NEUROTRANSMITTERS BINDS WITH RECEPTORS ON POST SYNAPTIC MEMBRANE
EXCITATORY LIGAND GATED Na channel Voltage gated Na CHANNEL DEPOLARIZATION
INHIBITORY ANION CHANNEL Negatively charged Cl hyperpolarization
NEUROTRANSMITTERS NEUROMDULATORS CHEMICALS COMBINE WITH PROTEIN
RECEPTORS TO OPEN OR CLOSE ION CHANNELS OR INITIATE SECOND MESSENGER SYSTEM
MODIFY NEURON SENSITIVITY TO SYNAPTIC STIMULATION OR INHIBITION
PERIPHERAL ENDINGS
SENSORY NEURON RECEPTORS
MOTOR NEURON EFFECTORS
RECEPTORS
RECEPTORS
STRUCTURES SPECIALIZED TO DETECT A STIMULUS
TRANSDUCERS FOUR TYPES OF INFORMATION
MODALITY LOCATION INTENSITY DURATION
RECEPTORS
NEUROEPITHELIAL OLFACTORY CELL BODY OF THE NEURONIS SITUATED PERIPHERALLY NEAR A SENSORY SURFACE & AXON PASSES TO CNS
EPITHELIAL GUSTATORY & AUDITORY
MODIFIED NON NERVOUS EPITHELIAL CELL INNERVATED BY
AN AXON NEURONAL ALL CUTANEOUS & PROPRIOCEPTORS
CELL BODY OF A PRIMARY SENSORY NEURON IN THE CRANIO SPINAL GANGLIA WITH AXON ACTING AS SENSORY TERMINAL
CLASSIFICATION
1) LOCATION EXTROCEPTORS general & specialPROPIOCEPTORSINTEROCEPTORS
2) STRUCTURAL ENCAPSULATEDNONENCAPSULATED
3) STIMULUS MODALITY CHEMO THERM NOCICEPTORS MECHANO &
PHOTORECEPTORS
NONENCAPSULATED
FREE NERVE ENDINGSMERKELS DISC
FREE NERVE ENDING
C.T. SKIN. MYELINATED & NON MYELINATED MODERATE THERMAL ,LIGHT
MECHANICAL & NOXIOUS STIMULI
MERKELS DISC
EPIDERMIS of non hairy skin HAIR FOLLICLE
NAKED AXON DISC SPECIALIZED EPITHEIAL CELL merkel
cell SLOWLY ADAPTING
MECHANORECEPTION light touch, texture, edges & shape
ENCAPSULATED
MEISSNERS CORPUSCLE DERMAL PAPILLA OF THICK SKIN CYLINDRICAL C.T. CAPSULE CONTINOUS WITH ENDONEURIUM
SURROUNDING A CENTRAL CORE STACKS OF MODIFIED FLATTENED SCHWAN
CELLS MYELINATED & NONMYELINATED FIBERS BRANCH
& RAMIFY RAPIDLY ADAPTING TOUCH RECEPTORS,
DISCRIMINATION END BULB OF KRAUSE MUCOUS MEMBRANE
PACCINIAN CORPUSCLE
DERMIS JOINT CAPSULE MAMMARY GLAND CAPSULE OF FLATTENED CELLS FIBERS &
MATRIX INTREMEDIATE GROWTH ZONE CELLULAR
MITOSIS CONTRIBUTES TO BOTH ZONES SINGLE NON MYELINATED NERVE
TERMINAL EXPANEDED END DEEP PRESSURE VIBRATION TENSION
GOLGI TENDON ORGAN
TENDON MUSCLE CAPSULE SHEETS OF CELLS SEPARATED BY A BASAL
LAMINA FIBERS ON THE OUTSIDE BUNDLE OF TENDON FIBERS HEAVILY MYELINATED NERVE FIBERS
FORMING A SPRAY SLOWLY ADAPTING MECHANORECEPTOR
MUSCLE SPINDLE
PROPIOCEPTORS > MUSCLES WITH FINE CONTROL DISTRIBUTED IN FLESHY PART OF
MUCLE
MUSCLE SPINDLE
CAPSULE INTRAFUSAL 3-12 MODIFIED MUSCLE FIBERS
NUCLEAR CHAIN & BAG FIBERMIDDLE PORTION ACTS AS STRETCH RECEPTORTWO ENDS HAVE SARCOMERE (CONTRACTION)
NERVE FIBERS EXTRAFUSAL MUSCLE FIBERS
NERVE FIBERS
PRIMARY AFFERNT & ANNULOSPIRAL ENDING ONSET OF STRETCH
SECONDRY AFFERENT FLOWER SPRAY PROLONGED STRETCH
GAMMA EFFERENT CONTRACTILE ENDS OF INTRAFUSAL FIBERS ADJUST TENSION IN THE MUSCLE SPINDLE TO VARIATION IN LENGTH OF MUSCLE
When a muscle shortens the gamma motor neurons stimulate the ends of intrafusal muscle fibers to contract slightly keeping them taut & responsive without this during contraction of extrafusal fibers they would become flabby