What is the fossa of the ear?
The fossa bounded by the tragus, incisura, antitragus, antihelix, inferior crus of the antihelix, and root of the helix, into which opens the external auditory canal. It is usually bisected by the crus helix into the cymba superiorly and cavum inferiorly.
What is ear keratosis?
Keratosis obturans is a relatively uncommon ear disease, where dense plug of keratin is present in the deep meatus of the ear. It is clinically diagnosed when removal of the debris shows silvery white peripheral matrix and causes excruciating pain.
What does the external acoustic meatus do?
The auricle (pinna) is the visible portion of 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 are the 3 anatomical regions divisions of the ear?
The three sections are known as; the inner ear, the middle ear, the outer ear. The inner ear is made up of the cochlea, the auditory nerve and the brain. The middle ear consists of the middle ear bones called the ossicles (malleus, incus, stapes). The outer ear includes the pinna, the ear canal and the eardrum.
What is scaphoid fossa?
FMA. 84973. Anatomical terms of bone. In the pterygoid processes of the sphenoid, above the pterygoid fossa is a small, oval, shallow depression, the scaphoid fossa, which gives origin to the Tensor veli palatini.
What is ear wax?
Earwax, also known by the medical term cerumen, is a brown, orange, red, yellowish or gray waxy substance secreted in the ear canal of humans and other mammals. It protects the skin of the human ear canal, assists in cleaning and lubrication, and provides protection against bacteria, fungi, and water.
What is white stuff in ear?
Most of the time, any fluid leaking out of an ear is ear wax. A ruptured eardrum can cause a white, slightly bloody, or yellow discharge from the ear. Dry crusted material on a child’s pillow is often a sign of a ruptured eardrum. The eardrum may also bleed.
What is external 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 structure of the external auditory canal is the same in all mammals.
What is the function of the external acoustic meatus quizlet?
protects ear canal and eardrum.
What are the parts of external ear?
The parts of the ear include:
- External or outer ear, consisting of: Pinna or auricle. This is the outside part of the ear.
- Tympanic membrane (eardrum). The tympanic membrane divides the external ear from the middle ear.
- Middle ear (tympanic cavity), consisting of: Ossicles.
- Inner ear, consisting of: Cochlea.
What is the orientation of the scaphoid fossa?
Proximally, the scaphoid articulates with the scaphoid fossa of the distal radius and the lunate. The orientation of the scaphoid fossa is 11 degrees volar and 21 degrees ulnar relative to the long axis of the radius, and therefore at ∼65 degrees to the long axis of the scaphoid in the frontal plane.
Can a retroauricular flap be used to reconstruct scaphoid fossa defects?
A retroauricular flap to reconstruct scaphoid fossa defects is presented. It is an easy, quick and aesthetic flap for this purpose. Treatment of malignant tumours of the external ear usually includes removal of underlying cartilage since the absence of subcutaneous tissue allows fixation and perichondrial involvement to occur early.’
What is the cartilaginous framework of the ear?
The external ear has a cartilaginous framework in all areas except the lobule. The outer curvature of the superior half of the auricle is the helix and is concave laterally. The antihelix is the next structure inward and is concave medially.
What is the difference between scaphoid fossa and tragus?
fossa triangularis: tiny depression between the crura. scaphoid fossa: the depression between the helix and anthelix. tragus: prominence in front of the external acoustic pore can be manually pushed back over the pore, to mitigate noise. antitragus: situated in the lower part of the anthelix and faces the tragus.