Comparison between tract and nerve

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  Comparison between tract and nerve Nerve Nerve contain bundle of axons (nerve fibers) in the peripheral nervous system (PNS) that transmits signals between the central nervous system (CNS) and other parts of the body. It is the most important part of peripheral nervous system Location: Peripheral nervous system. Structure: Made of axons, connective tissue layers (endoneurium: axon is surrounded by it , perineurium: bundle of axons are surrounded by it, epineurium: whole nerve trunk is surrounded by it), and blood vessels. It gets myelination by Schwann cell   Function: Carries sensory signals to the CNS (afferent) from peripheral part of body or motor signals carry from from the CNS (efferent) to target organs like skeletal muscle, cardiac muscle, smooth muscle or glands Example: Sciatic nerve, median nerve, except optic nerve (though optic nerve is technically part of CNS in develop...
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Difference between two tiny muscles of middle ear cavity : tensor tympani and stapedius muscles

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Difference between two tiny muscles of middle ear cavity : tensor tympani and stapedius muscles



Topics

Tensor tympani

Stapedius
Origin :
Both cartilaginous and bony part of auditory tube
Interior of pyramid which situated on the posterior wall of middle ear cavity
Insertion
Medial aspect of neck of malleus
Posterior aspect of neck of stapes
Blood supply
Superior tympanic artery branch of middle meningeal artery
Posterior auricular artery , a branch of external carotid artery
Anterior tympanic artery and middle meningeal artery
Nerve supply
Nerve to medial pterygoid branch of mandibular division of trigeminal nerve
Facial nerve
Nerve related with ganglia
Nerve to medial pterygoid passes through otic ganglia
None
Functions
It tenses the tympanic membrane and push the base of stapes more tightly into the fenestra vestibule
Draws the stapes laterally and opposes the action of tensor tympani muscle (which pushes the stapes more tightly into the fenestra vestibuli)

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