sonogram
echoencephalography
Electrocardiograph technician
It is produced in the brain by modified ependymal cells in the choroid plexus.
An ultrasound does not provide information about a brain tumor.
Cranial Ultrasound
Neurosonography is a small, specialized section of ultrasound, frequently used in the NICU on premature babies. Images of the brain are able to be produced on premature and young babies due to the skull not being fully fused together yet, therefore allowing the ultrasound beam to reach the brain tissue. Neurosonography is also used before the baby is born, and still in the mother's womb. Once the skull has fused, transcranial ultrasound is still possible to an extent, through very small openings within and around the skull. This area of ultrasound is frequently used in high risk pediatric and specialty hospitals, such as St. Jude Children's research hospital. Using ultrasound on the brain of a fully fused skull is more challenging because an ultrasound beam cannot penetrate through bone. However, with skill and knowledge, it is possible to obtain brain images.
The sound causes vibration of special structures in our ear. These structures, called stereocilia, are basically sort of "cell hair". When these hair move, a signal in the cells is produced. This signal is transmitted by nerves to brain. The existence of this signal in brain = "activation of brain cells". How do our brain cells work when we talk? They just produce signals leading to nerves which control our vocal centers. The question is not specific enough.
The Frontal Cortex
I believe you're talking about sonography. The best known form of which is ultrasound for pregnant women. However, there are many other uses of ultrasound. It is often used to conduct an echocardiogram (an image of the heart), as well as looking for bleeds in the brain.
The brain's structures are shown in this video.
Because pigs and humans are mammals, their brains are relatively similar. The basic structures in the brain are the same, but the size of the structures may differ.
The main structures of the brain are the cerebrum (the fore brain), the cerebellum (the hind brain), the brain stem.