Question | Answer |
External ear | consists of the auricle and the external auditory canal |
What is the auricle composed of | except for the lobule, the auricle is composed of elastic cartliage and skin |
How is the auricle attached to the head? | by the external auditory canal and several small muscles innervated by the facial nerve |
Innervated | Supply (an organ or other body part) with nerves. |
External Auditory Canal | cartilaginous in the lateral third and bony in the inner two-thirds |
Cartilaginous portion of the skin contains... | hair follicles, sebaceous glands, and cerumen glands |
What provides potential pathways for the spead of tumor and infection from the canal into the parotid gland? | Small dehiscences in the anterior portion of the cartilaginous external auditory canal. |
Dehiscences | the release of materials by the splitting open of an organ or tissue. |
What are the borders of the external ear canal? | The temporal lobe superiorly, mastoid posteriorly, TMJ and parotid gland anteriorly, and the TM medially. |
What recieves it's blood supply from the superficial temporal and posterior auricular branches of the external carotid artery? | aurticle and external auditory canal |
An air-containing space with bony walls except for the TM laterally. | middle ear |
In the middle ear, what leads downward and medially to the nasopharynx? | eustacian tube |