What is the clinical importance of the suprameatal triangle?
Since it covers the lateral wall of the mastoid air system, the suprameatal triangle is of importance to otologic surgeons during mastoidectomy. Because of this clinical importance, topographic anatomy of the suprameatal spine and depression was studied on Anatolian skulls.
What is suprameatal triangle?
The suprameatal triangle (Macewen, mastoid fossa) is an area between the posterior wall of the external acoustic meatus and the posterior root of the zygomatic process. In this area, an instrument may be pushed into the tympanic antrum.
What does the mastoid process do?
The mastoid process is located in the posterior portion of the temporal bone. It is one of the two projections situated behind the ear. The mastoid process provides an attachment for certain muscles of the neck.
Where is the mastoid notch?
The mastoid notch is a deep groove on the medial side of the mastoid process that can be clearly identified.
What is external acoustic meatus?
external auditory canal, also called external auditory meatus, or external acoustic meatus, passageway that leads from the outside of the head to the tympanic membrane, or eardrum membrane, of each ear. The canal is nearly 1 inch (2.5 cm) in length and is lined with skin that extends to cover the tympanic membrane.
What is cortical mastoidectomy?
A type of mastoidectomy typically used for mastoiditis, which consists of removing the mastoid air cells without affecting the middle ear.
What is the mastoid process and why is it important?
Mastoid Process Function 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.
What are complications of mastoiditis?
Complications of mastoiditis include the following:
- Hearing loss.
- Facial nerve palsy.
- Cranial nerve involvement.
- Osteomyelitis.
- Petrositis.
- Labyrinthitis.
- Gradenigo syndrome – Otitis media, retro-orbital pain, and abducens palsy.
- Intracranial extension – Meningitis, cerebral abscess, epidural abscess, subdural empyema.
What is the function of the mastoid process and styloid process?
The styloid process lies anterior and medial to the mastoid process, and in between them is the stylomastoid foramen. This foramen allows the muscular branch of the facial nerve to leave the skull and go onto innervate the muscles of facial expression.
What is the significance of the foramen magnum of the occipital bone?
The foramen magnum functions as a passage of the central nervous system through the skull connecting the brain with the spinal cord. On either side of the foramen magnum is an occipital condyle. These condyles form joints with the first cervical vertebra.
What is the purpose of the external auditory meatus?
The external acoustic meatus conducts sound waves to the tympanic membrane.
How is the suprameatal triangle used in surgery?
This triangular structure is used as an important landmark in operations involving the mastoid antrum, such as Cortical Mastoidectomy. During Mastoidectomy, an instrument may be inserted into the mastoid antrum through this triangle. Here are some Suprameatal triangle images that you will find useful.
Where is the suprameatal triangle in the temporal bone?
The suprameatal triangle is an area in the temporal bone. The posterior wall of the external, bony acoustic meatus A line that links the extremities of the zygomatic arch root and the posterior acoustic meatus The structure is also known as Macewen’s triangle.
Where is the supreameatal triangle located in the body?
The supreameatal triangle is located in a deep position to the cymba conchae. This triangular structure is used as an important landmark in operations involving the mastoid antrum, such as Cortical Mastoidectomy.