What does mastoid mean in anatomy?
Definition of mastoid (Entry 1 of 2) 1 : being the process of the temporal bone behind the ear also : being any of several bony elements that occupy a similar position in the skull of lower vertebrates.
What are the content of mastoid process?
Mastoid process It has variable size and form (e.g. it is larger in the male than in the female). It is also filled with sinuses, or mastoid cells. The mastoid process serves for the attachment of the sternocleidomastoid, the posterior belly of the digastric muscle, splenius capitis, and longissimus capitis.
Where is the mastoid process bone located?
The mastoid is located just behind the ear. Mastoiditis is an infection of the bony air cells in the mastoid bone, located just behind the ear. It is rarely seen today because of the use of antibiotics to treat ear infections. This child has noticeable swelling and redness behind his right ear because of mastoiditis.
What is the location and function of the mastoid process?
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 the bone behind the ear called?
The mastoid bone is located behind the ears. If you slide your hand up the neck behind the ear you will feel it as a bony prominence. The inside of the mastoid bone is aerated.
What muscles attach to mastoid?
The mastoid process is part of the temporal bone. It is the insertion for the sternocleidomastoid muscle. In fact it is this muscle that causes this landmark to develop.
What is the origin of sternocleidomastoid?
Sternocleidomastoid Attachments It originates on the anterior surface of the manubrium, and the superior border and anterior surface of the medial third of the clavicle. The SCM converges into one point and inserts on the lateral surface of the mastoid process and the nuchal line of the occipital bone.
What is the bone behind your ear called?
What is the importance of the mastoid process of the skull?
The mastoid process’ main function is to provide an area of attachment to several important muscles in the head. For instance, it is the attachment site of certain muscles of the neck: Sternocleidomastoid muscle – enables the rotation of the head to the contralateral side.
Is mastoid a bone?
The mastoid bone has a honeycomb-like structure that contains air spaces called mastoid cells. Mastoiditis can develop if the mastoid cells become infected or inflamed, often following a persistent middle ear infection (otitis media). Cholesteatoma can also cause mastoiditis.
What is 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 is the landmark of mastoid process?
Is the sternocleidomastoid anterior or posterior?
Sternocleidomastoid is a long muscle which acts as an important landmark in the neck as it divides the neck into anterior and posterior triangles. The Anterior Triangle is described as being bounded by mid line anteriorly, anterior border of sternocleidomastoid posteriorly and the lower border of mandible superiorly.
What is the attachment of the sternocleidomastoid?
Where is the sagittal suture?
Sagittal suture. This extends from the front of the head to the back, down the middle of the top of the head. The 2 parietal bone plates meet at the sagittal suture.
What is bone behind ear called?
Is mastoid part of middle ear?
The lateral wall of the antrum is formed by a plate of bone which is an average of 1.5 cm in adults. The mastoid air cell system is a major contributor to middle ear inflammatory diseases….
| Mastoid antrum | |
|---|---|
| FMA | 55711 |
| Anatomical terms of bone |