What is Macewens triangle?

The MacEwen triangle (also called the suprameatal triangle or mastoid fossa) is a surgical landmark on the surface of the temporal bone just superior to the external auditory canal used to locate the level of the mastoid antrum.

What is the important posterior relation of the mastoid antrum?

The mastoid antrum (tympanic antrum, antrum mastoideum, Valsalva’s antrum) is an air space in the petrous portion of the temporal bone, communicating posteriorly with the mastoid cells and anteriorly with the epitympanic recess of the middle ear via the aditus to mastoid antrum (entrance to the mastoid antrum).

What does mastoid antrum mean?

The mastoid antrum (plural: mastoid antra) (also known as tympanic antrum or Valsalva antrum) is an air space (up to 1 cm in size) lying posterior to the middle ear and connected to it by a short passageway, the aditus ad antrum.

What does the mastoid process do?

Definition. The mastoid process is a smooth conical projection of bone located at the base of the mastoid area of the temporal bone. It allows the attachment of muscles such as the occipitofrontalis muscle, as well as certain muscles of the neck like the sternocleidmastoid and splenius capitis muscles.

What is spine of Henle?

The inner end of the external acoustic meatus is closed, in the recent state, by the tympanic membrane; the upper limit of its outer orifice is formed by the posterior root of the zygomatic process, immediately below which there is sometimes seen a small spine, the suprameatal spine also called the spine of Henle.

What is cortical mastoidectomy?

5 Cortical Mastoidectomy Exenteration of the mastoid portion of the temporal bone without disturbing the anatomical integrity of the external and middle ear. This is the basic operation in temporal bone surgery. It is also called “simple mastoidectomy”.

What is the Supramastoid crest?

[ sōō′prə-măs′toid′ ] n. The ridge that forms the posterior root of the zygomatic process of the temporal bone.

What is the purpose of the outer ear?

The Outer Ear It collects sound waves and channels them into the ear canal (external auditory meatus), where the sound is amplified. The sound waves then travel toward a flexible, oval membrane at the end of the ear canal called the eardrum, or tympanic membrane.

What is aditus ad antrum?

Anatomical terminology. The aditus to mastoid antrum (otomastoid foramen or entrance or aperture to the mastoid antrum) is a large irregular cavity that leads backward from the epitympanic recess into a considerable air space named the tympanic or mastoid antrum.

What part of the ear is connected to tympanic antrum?

the mastoid (posterior) wall: This features the aditus (opening) to the mastoid antrum in its superior part, which connects the tympanic cavity to the mastoid cells.

What is Aditus ear?

56797. Anatomical terminology. The aditus to mastoid antrum (otomastoid foramen or entrance or aperture to the mastoid antrum) is a large irregular cavity that leads backward from the epitympanic recess into a considerable air space named the tympanic or mastoid antrum.

Is mastoid antrum present at birth?

In a histologic study of the temporal bones of newborns, conducted by Valtonen and Karmody, the mastoid antrum was noted to be present in all subjects, without significant differences for age, gender, or laterality (right versus left).