Chapter 10: Head, eyes, ears, nose, throat Flashcards
tinnitus
ringing in the ears
Six bones
form the skull
(one frontal bone, two parietal bones, two
temporal bones, and one occipital bone) and are fused
together at sutures.
The facial
muscles are innervated by cranial nerves
V (trigeminal) and
VII (facial).
sclera
is a tough, fibrous outer layer commonly
referred to as the white of the eye.
palpebral conjunctiva
lines the eyelids and contains
blood vessels, nerves, hair follicles, and sebaceous glands
cornea
tears supply oxygen.
allow light transmission
through the lens to the retina.
The central opening of the iris
the pupil,
allows light transmission to the retina through the transparent
lens.
The inner layer of the eye, the retina,
is an extension of the
central nervous system. This transparent layer has photoreceptor
cells, termed rods and cones
tempanic membrane TM
composed of layers of skin,
fibrous tissue, and mucous membrane, is shiny and pearl
gray.
the eustachian tube
It opens briefly during
yawning, swallowing, or sneezing to equalize the pressure of
the middle ear to the atmosphere.
organ of Corti
the structure that is responsible for
hearing. Specialized hair cells on the organ of Corti act as
sound receptors.
nasal cavity is lined
with
highly vascular mucous membranes containing cilia
(nasal hairs) that trap airborne particles and prevent them
from reaching the lungs.
make the skull lighter
air-filled cavities (i.e., sphenoid, frontal, ethmoid, and maxillary)
They
are lined with mucous membranes and cilia that move secretions
along excretory pathways.
thyroid gland, the largest endocrine gland in the body,
produces two hormones
thyroxine (T4) and triiodothyronine
(T3), which regulate cellular metabolism. Mental and
physical growth and development depend on thyroid hormones.
The most commonly reported problems related to the head
and related structures (eyes, ears, nose, throat, and neck)
include
headache, dizziness, difficulty with vision, hearing
loss, ringing in the ears, earache, nasal discharge, sore throat,
and mouth lesions.