What is nasal mucus? The nasal cavity is lined with a thin lining known as the epithelium that has specialized cells which produce and secrete mucus. This nasal epithelium is not significantly different from epithelium lining the rest of the respiratory tract. Mucus is constantly produced to : trap dust particles and >> Read More ...
Why does the nose drip mucus? Nasal problems typically present with a runny nose or nasal congestion. The mucous membrane lining the inside of the nasal cavity produces mucus throughout the day to keep the membrane moist. The constant movement of air through the nasal cavity with breathing can quickly dry up the membranes >> Read More ...
The sense of vision is enabled by several components in the human eye and close to it – the visual apparatus of the eye, the nerves that carry signals to the brain and brain centers that decipher these impulses. Light has to enter the eye unobstructed, be refracted (bent) by the cornea and lens at the optimal angles >> Read More ...
The middle ear lies behind the eardrum and is separated from the inner ear by the round and oval window. This area is somewhat shaped like a box with six walls. It contains the auditory ossicles (hearing bones) that transmits vibrations from the eardrum to the hearing apparatus in the inner ear. A hollow cavity known as >> Read More ...
The mucosal epithelium lining the nasal passages ensures that a constant supply of mucus maintains the health of upper respiratory tract. The movement of air has a drying effect so the mucus keeps the area moistened. Dust and airborne microbes are trapped in the mucus and not allowed to travel deeper into the respiratory >> Read More ...
The inner ear has several structures that are responsible for the sense of hearing and balance. It has a passage known as the labyrinth which can be divided into the a bony part which lies in the temporal bone of the skull and a membranous part that runs within the bony labyrinth. These two parts of the labyrinth are >> Read More ...
The outer ear extends from clearly visible pinna (auricle) to the ear canal (external auditory canal) and ends at the ear drum (tympanic membrane). The outer ear focuses sound waves onto the eardrum which then vibrates. After transmission of these vibrations through the middle ear and stimulation of the hearing apparatus >> Read More ...
Behind the ear drum lies a hollow air-filled cavity known as the middle ear. It is shaped somewhat like a box and has six walls. Within it lies the auditory ossicles (middle ear bones) which transmits vibrations from the ear drum caused by sound to the hearing apparatus in the inner ear. A hollow cavity connects the middle >> Read More ...
The paranasal sinuses are hollow air-filled cavities in the skull. There are four pairs of paranasal sinuses known as the frontal, sphenoid, ethmoid and maxillary sinuses. These cavities are lined with a mucous membrane and its secretions usually drain through small openings (ostia) into the nasal cavity. Since the sinuses >> Read More ...
The sinus cavities, proper term paranasal sinuses, are hollow air-filled cavities in the skull located around the nasal cavity. These rather unassuming pockets in the skull bone may have several important functions and are also prone to diseases that affect the nasal cavity. All the paranasal sinuses are connected to >> Read More ...
