The structure of the ear of a person, jaws and head.
The structure of the human ear is a whole chain of auditory canals, and so important that any negative impact can become a very serious problem.
Thanks to the four departments, we can catchany sounds that surround us. The most visible organ for us is the auricle and behind it the external auditory canal. On it the sound passes to the middle ear. If the external ear was subjected to deformation at birth, then the sound normally can not pass. Also, hearing can be disturbed due to sulfur, which often blocks the ear canal.
No matter how we look at the structure of the human ear,we will not see the middle ear. However, it exists and is located behind the eardrum. The cavity of the middle ear is ideally filled with air, but in the presence of any diseases it is filled with liquid. The motion of the tympanic membrane indicates the presence of fluid, inflammation or other disorders.
Further, the structure of the human ear is represented byThe inner ear, in which there are about forty thousand hair cells. They are catchers of sound vibrations of different frequencies and generators of weak electrical impulses transmitted to the brain, more precisely to its cortex. Damage or loss of hair cells is a stop for electrical impulses, resulting in a significant deterioration in hearing.
Snail and auditory centers of the brain area passageway for the fibers of the auditory nerve. The electrical impulses that arise in the cochlea reach the auditory centers of the brain, and the obstacles that arise in their path distort the sound. It becomes fuzzy, muffled.
The structure of the human ear is an uneasy hearing aid, which requires special attention and careful care.
The structure of the human jaw is a very complex mechanism, which at first glance seems to perform only a chewing function. However, it is not.
The most important is the upper jaw, a pair, located in the upper anterior area of the facial skull. It is considered one of the airbones forming the maxillary sinus.
The bone itself is represented by the body and four processes. The body has four surfaces: the orbital, anterior, nasal, transverse. The processes of the bone have a frontal, zygomatic, alveolar and frontal parts.
The lower jaw is represented by an unpaired bone. In itself, it is large and strong, having two symmetrical halves that join together in the middle in a single bone to the first year of the child's life. The lower jaw has a body and a pair of flattened branches. The body of the lower jaw is caused by the base and the upper part. The upper part smoothly passes into the so-called alveolar process. Each side of the lower jaw forms the angle of the lower jaw. The result of the dentist's work directly depends on the knowledge of the structure of the bone of the lower jaw.
The structure of the human head is the structure of his skull, which is divided into two parts - the facial and the brain.
The cerebral part is represented by the frontal, twoparietal, two temporal, occipital and other bones. All these bones serve as a reliable defense to the brain. The individual bones of the cerebral cranium are interconnected by a very complex suture resembling a joint of the crocodile teeth, which, when engaged, enter each into its recess.
Inside the cerebral part of the skull is a cavity that is filled with the brain.
The facial part has paired bones: maxillary, zygomatic, nasal, palatine, unpaired mandibular. The bones are connected together in a fixed manner.
Also in the front part there is a nasal cavity, mouth and two eye sockets.
Glaznitsa looks like a deep cavity in which an eyeball is located, framed by the interlacing of nerves, muscles and vessels.
The nasal cavity is divided by a septum into two halves, each of which has narrowed nasal passages.
The oral cavity is separated from the nasal by the palatine bones and the processes of the maxillary. It is limited by the upper and lower edges of the jaws.
