Mastoid sentence example
- The following are the characters of the second sub-family, Heteromyinae: Incisors narrow; mastoid appearing largely on the top of the skull; eyes and ears moderate or large; hind-limbs and tail elongated.
- They have long hind limbs, large eyes and ears; and in correlation with the latter an enlarged auditory bulla to the skull, which is hollow and divided into a tympanic and a mastoid portion.
- In the highly specialized mastoid region of the skull, the North American Oligocene Protoptychus approaches to Dipopodomys, while the contemporary Gymnoptychus and Entoptychus likewise appear referable to the Geomyidae.
- Neanderthals also had a pronounced series of bony crests on their mastoid process, located just behind their ears.
- Infection of the mastoid air cells is called mastoid air cells is called mastoiditis.Advertisement
- The patient wears headphones when air conduction is tested and a vibrating earpiece behind the ear next to the mastoid bone or along the forehead when bone conduction is tested.
- Mastoiditis is a bacterial infection of the air cells in the mastoid bone of the skull.
- The infection may spread from the ear to the mastoid bone of the skull, which is the bony bump off the base of the skull, located just behind the ears slightly above the level of the earlobe.
- The mastoid bone is composed of air cells that are in communication with the middle ear.
- If the air cells fill with infected materials, the mastoid honeycomb-like structure may deteriorate.Advertisement
- X rays are considered unreliable but can show clouding of the mastoid air cells.
- A head CT scan or CT of the ear may show a fluid-filled middle ear and an abnormality in the mastoid bone.
- Mastoiditis-An inflammation of the bone behind the ear (the mastoid bone) caused by an infection spreading from the middle ear to the cavity in the mastoid bone.
- Surgery may also be a recourse, to remove the affected portion of the mastoid bone, to remove a cyst should one be present, and do any further repair required.
- Electrodes are surgically implanted into the cochlea through a hole drilled in the mastoid bone.Advertisement
- During the procedure, the surgeon makes an incision behind the ear and opens the mastoid bone (the ridge on the skull behind the ear) leading into the middle ear.
- The first of these, or Geomyinae, is characterized as follows: Incisors broad; mastoid not appearing on the top of the skull; eyes small; ears rudimentary; limbs short, subequal.