Outer Ear
Most prominent rim of the auricle.
What is the helix?
The primary function of the Eustachian tube
What is pressure equalization
This lower cochlear duct is filled with perilymph, connects with the round window and sits opposite the tympanic cavity.
What is the Scala tympani?
The largest of the ascending brainstem auditory nuclei.
What is the Inferior Colliculus?
Deepest depression on the auricle and leads to the external auditory canal.
What is the concha cava?
A rounded prominence in the medial wall of tympanic cavity formed by the lateral projection of the basal turn of the cochlear.
What is the promontory?
This fluid is present in scala media; it's composition is high in potassium (k+) and low in sodium (Na+).
What is endolymph?
This is the first site for binaural processing
What is superior olivary complex?
A prominence on the auricle that sits close to the face, located infant of the concha and projects backwards, slightly over the ear canal opening.
What is the tragus?
The muscle within the middle ear that is innervated by CN VII (Facial nerve), whose role is to provide tension on the oval window during contraction.
What is the Stapedius muscle?
This part of the cochlea allows communication between scala tympani and scala vestibuli.
What is the Helicotrema?
First level of crossover for signal processing
What is the cochlear nucleus?
This type of gland in the ear canal contributes to the oily portion of cerumen
What is a sebaceous gland?
The three layers of the tympanic membrane.
What are epidermal, fibrous, membranous?
This structure is located in the scala media; it's the sensory end organ of hearing; situated on basilar membrane; includes sensory cells, inner and outer hair cells, and supporting cells
What is the organ of corti?
This structures primary role is to transfer information from one side of the brain to the other.
What is the Corpus Collosum?
Name at least 2 functions of the outer ear.
Changes amplitude & phase of sound, Funnels and transmits sound to the TM, sound localization, protects the ear canal from dirt/debris
Stiffness and mass play a large part on the function of the middle ear, how do changes in each affect hearing?
Increased mass will cause a HF hearing loss
This structure provides blood and produces endolymph for the scala media.
What is the stria vascular?
This structure of the brain is considered the primary auditory cortex.
What is Heschl’s gyrus?