What is the histology of the spinal cord?
Within the spinal cord the grey matter forms an H-shape where the ventral horns of the H are broader than the dorsal horns. The grey matter shape has also been likened to that of a butterfly. The grey matter also has a histologically visible central canal running through it.
How are action potentials generated in the cochlear nerve?
Action potentials (APs) propagate along axons of bipolar cochlear ganglion cells, forming point-to-point connections between hair cells and the cochlear nucleus (see Fig. 1A,B). There are two types of ganglion cells. Type I is myelinated, innervates one inner hair cell each, and provides rapid discrete coding.
What is the histology of the nervous system?
Nerve tissue consists of 2 principal types of cells: neurons and supporting cells. The neuron is the structural and functional/electrically excitable unit of the nervous system. It is divided according to its anatomical components as well as its functional characteristics.
What slide is used in the laboratory in studying a nerve cell?
Virtual Microscope Slides Identify the dorsal and ventral sides. Distinguishing the white matter from the gray matter.
What nerve innervates the cochlea?
vestibulocochlear nerve
The vestibulocochlear nerve has two components within a single trunk: the vestibular nerve, which innervates the semicircular canals of the inner ear and is involved with equilibrium, coordination, and orientation in space, and the cochlear nerve, which innervates the cochlea and subserves hearing.
What directly causes an action potential in the cochlear duct?
The influx of Ca2+ stimulates the release of neurotransmitter by the hair cell triggering an action potential in the neuron that synapses with the hair cell. The axons of these neurons form the cochlear nerve that transmits the action potential to the auditory cortex of the brain.
What type of tissue is spinal cord?
Nervous Tissue
Nervous tissue is found in the brain, spinal cord, and nerves. It is responsible for coordinating and controlling many body activities.
Could you see dendrites on the microscope slide of the spinal cord cross section?
Could you see them on the microscope slide of the spinal cord section slide? Dendrites have a lot of branches with a long single axon, it receives info. from other neuron cells + is about 80-90% of the neuron surface area. I could not see them on the slide bc there are no axons present.
What are cochlear nerves?
The cochlear nerve is responsible for transmitting auditory signals from the inner ear to the cochlear nuclei, within the brainstem, and ultimately to the primary auditory cortex, within the temporal lobe.[3][4]
What is the fluid that fills the cochlear duct?
The cochlear canals contain two types of fluid: perilymph and endolymph. Perilymph has a similar ionic composition as extracellular fluid found elsewhere in the body and fills the scalae tympani and vestibuli.
Why is potassium important to hearing function?
Both the high potassium concentration and the positive potential are generated by the epithelium of the stria vascularis in the lateral wall of the scala media. The stria vascularis thereby generates the driving force for sound detection by hair cells, which require almost no input of metabolic energy.
What is spinal cord histology?
You know spinal cord is the elongated and cylindrical caudal part of the central nervous system of animal. In the spinal cord histology, you will find the inner core of gray matter and outer covering of white matter. I will also discuss on these gray matter and white matter of spinal cord structure later in this article.
Which cell lines the central canal of the spinal cord?
The central canal is line by the ependymal cell (tall columnar cell) #5. Presence of cell bodies of neurons and interneurons at the gray matter of spinal cord structure #6. There are ascending and descending myelinated nerve fibers present at the white matter of spinal cord structure
What are the anterior and posterior horns of the spinal cord?
You know the anterior horn of gray matter extends toward the front of the spinal cord and are more prominent than the posterior horn. Again, the posterior horns are the sensory area and contain the smaller neurons cells bodies. Gray matter of spinal cord is surrounded by the white matter.
What is the central canal in gray matter histology?
In gray matter histology you will find the H shaped structure with anterior and posterior horns which is connected by a gray commissure. In this gray commissure you will find the central canal that is lined by ependymal cell. #1. Nerve cell bodies and their processes