Objective To investigate the fire patterns of the primary cultured postnatal mouse spiral ganglion neurons.Methods Current-clamp recordings with the use of the whole cell configuration of the patch-clamp technique were made from the primary cultured spiral ganglion neurons. Results The action potential was recorded from the spiral ganglion neurons. The neurons had non-uniform firing characteristics. Conclusion There were two firing patterns observed in the spiral ganglion neurons, rapid adaptation, and slow adaptation and the largest neurons showing rapidly adapting.

Objective: To explore the nature of voltage dependent ion channels and basic electrophysiological characteristics of cochlear spiral ganglion neurons of apical and basal turn by patch clamp techniques of whole cell configure on murine spiral ganglion neurons. Method: Different voltage dependent ionic currents were recorded with patch clamp techniques of whole cell configure on the condition of different internal electrode solution,blockers and stimulus protocol. Result: Inward sodium channel current(I_(Na)), hyperpolarization-activated inward cationic current(I_h) ,outward delay rectification potassium current (I_k) and outward transient potassium current (I_A)were recorded , significant difference of electrophysiological characteristics of I_A and I_k was found between apical and basal turns(P＜0.05). Conclusion: Various ionic currents are recorded,which shows that spiral ganglion neurons have the base of ionic channels to complete formation,conduction and modulation of action potential for auditory information transduction, the difference of electrophysiological characteristics between apical and basal turns contributes to the course of hearing formation.

OBJECTIVE: To explore the nature of voltage dependent ion channels and basic electrophysiological characteristics of cochlear spiral ganglion neurons of apical and basal turn by patch clamp techniques of whole cell configure on murine spiral ganglion neurons. METHOD: Different voltage dependent ionic currents were recorded with patch clamp techniques of whole cell configure on the condition of different internal electrode solution, blockers and stimulus protocol. RESULT: Inward sodium channel current (I(Na)), hyperpolarization-activated inward cationic current (Ih), outward delay rectification potassium current (I(K)) and outward transient potassium current (I(A)) were recorded ,significant difference of electrophysiological characteristics of I(A) and I(K) was found between apical and basal turns (P < 0.05). CONCLUSION Various ionic currents are recorded, which shows that spiral ganglion neurons have the base of ionic channels to complete formation,conduction and modulation of action potential for auditory information transduction, the difference of electrophysiological characteristics between apical and basal turns contributes to the course of hearing formation.
Animals ; Cells, Cultured ; Ion Channels ; physiology ; Membrane Potentials ; physiology ; Mice ; Mice, Inbred Strains ; Neurons ; physiology ; Patch-Clamp Techniques ; Spiral Ganglion ; physiology

OBJECTIVE: To explore the application of inner plate of frontal sinus-epidural approach in the treatment of anterior skull base cranio-nasal communication tumors. METHOD: A study of 6 cranio-nasal communication tumor patients was undertaken. They were treated with lateral rhinotomy-inner plate of frontal sinus-epidural approach to remove tumor. RESULT: The tumors in all the 6 patients were completely resected. The follow-up study during the following 2 years revealed that 5 patients had good facial appearances and showed no tumor recurrence, no cerebrospinal rhinorrhea, no meningoencephalocele, no frontal collapse, and other complications. CONCLUSION The surgical approach in the treatment of Cranio-nasal communication tumors needs to be chosen according to the tumor size, location and nature. Lateral rhinotomy-inner plate of frontal sinus-epidural approach can be carried out independently by the head and neck surgeons. It is a valuable surgical treatment with minimal invasion, short surgery time, little damage to brain, and easy pyrosis of skull base.
Adult ; Epidural Space ; surgery ; Female ; Frontal Sinus ; surgery ; Humans ; Male ; Middle Aged ; Nose Neoplasms ; parasitology ; surgery ; Paranasal Sinus Neoplasms ; pathology ; surgery ; Skull Base Neoplasms ; pathology ; surgery