According to a faculty member at the University of Washington, gyri and sulci arose as a way to pack more brain volume within the finite dimensions of the skull. The larger the surface area of the brain, the more neurons it can hold. Therefore, many highly intelligent animals have evolved wrinkled brain surfaces that increase the relative surface-to-volume ratio.Know More
The gyri and sulci are composed of grey matter, one of the primary types of brain tissue. The University of Washington explains that the fissures or crevices are called sulci. The bumps or raised areas between the sulci are called gyri. Each person has a unique combination and pattern of sulci and gyri. Because of these wrinkles, the human brain has approximately 324 inches of surface area, which is about the same amount of surface area of a piece of large newspaper.
The University of Washington contends that the gyri and sulci help to divide the cerebrum into four basic lobes, or sections. The occipital lobe is located at the rear of the brain, while the frontal lobe is located at the front of the brain. The temporal lobes occur along the sides of the brain, while the parietal lobes are located along the top of the brain.Learn more about Human Anatomy
The skull is composed of distinct bony plates that come together at joints called sutures that allow little or no movement, especially in adults. The joints between teeth and their sockets, called gomphoses, also allow very little movement.Full Answer >
Duke Magazine notes that the bones in the skull continue to grow as people age. The forehead tends to move forward while the cheekbones move slightly backwards, causing subtle changes to the human face. Because the facial bones tilt forward as people age, it causes sagging of the soft tissues.Full Answer >
According to Medline Plus, suture joints are also known as cranial sutures and are comprised of bands of fibrous tissue that connect the bones of the skull. Cranial sutures are necessary for brain growth and development.Full Answer >
The oropharynx accepts air from the nasopharynx and passes it to the laryngeal pharynx. It also accepts food from the mouth and passes it to the esophagus. The oropharynx resides below the soft palate and above the epiglottis. Taken in totality, the pharynx connects the oral cavity and nasal cavity with the esophagus and windpipe.Full Answer >