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The cochlea is a portion of the inner ear that looks like a snail shell (cochlea is Greek for snail). [5] The cochlea receives sound in the form of vibrations, which cause the stereocilia to move. The stereocilia then convert these vibrations into nerve impulses which are taken up to the brain to be interpreted.
The cochlear nerve carries auditory sensory information from the cochlea of the inner ear directly to the brain. The other portion of the vestibulocochlear nerve is the vestibular nerve , which carries spatial orientation information to the brain from the semicircular canals , also known as semicircular ducts.
The cochlea propagates these mechanical signals as waves in the fluid and membranes and then converts them to nerve impulses which are transmitted to the brain. [4] The vestibular system is the region of the inner ear where the semicircular canals converge, close to the cochlea.
Left arm pain can happen after an injury or pinched nerve. But in some cases, it could be an early indicator of a heart problem. Here’s what you need to know.
Referred pain, also called reflective pain, [1] is pain perceived at a location other than the site of the painful stimulus.An example is the case of angina pectoris brought on by a myocardial infarction (heart attack), where pain is often felt in the left side of neck, left shoulder, and back rather than in the thorax (chest), the site of the injury.
"That can cause a sharp chest pain that can also spread to your left arm or shoulder," Lala says. "It can be worse when you're lying down or when you're taking deep breaths." Coronary artery ...
Chest pain due to coronary ischemia commonly radiates to the arm or neck. [7] Certain individuals such as women, diabetics, and the elderly may present with more varied symptoms. [ 8 ] If blood flow through the coronary arteries is stopped completely, cardiac muscle cells may die, known as a myocardial infarction, or heart attack.
Angina is chest pain that happens when an area of your heart muscle doesn’t get enough oxygen-rich blood, according to the National Heart, Lung, and Blood Institute (NHLBI). The pain can happen ...