RA 2 Eye Flashcards
The organ of vision, which occupies the anterior part of the orbital cavity
EYE
THE EYE
Protected by the bony orbit and the upper and lower eyelids (palpebrae).
(aka orbital cavity) the eye socket.
Orbit
In ____ itself, the eye is set in a bed of muscle and adipose/fat. Nature defense to help protect eye
orbital cavity
(area of greatest distance in orbital cavity) is backward & medial-ward & it lies 1.5 inches deep
Apex of orbital cavity
Diameter of eyeball is
approximately ___ and slightly ___ on female; size of eyeball remains ____ from puberty to adulthood
1 inch
less
constant
- External convexity of eyeball is increased by the ___ (diameter of ___) which convexity of cornea adds surface contour form and influence curve of upper eye and offset medially ever so slightly
cornea
½ inch
The eyeball rest in the ___ of socket in muscle and fat.
center 2/3
Difference in appearance are due to variation in ___ & not eyeball size
bone structure
Margings of Orbital Cavity (provides margin & influence of cavity)
a. Frontal bone
b. Zygomatic bone
c. Maxilla
Orbital Margins
a. Superior Orbital Margin (supraorbital margin)
b. Lateral Orbital Margin (zygomaticofrontal process)
c. Inferior Orbital Margin (maxilla & zygomatic bones)
d. Medial Orbital Margin (frontal process of maxilla)
Superior rim of the eye socket located on the frontal bone. It projects anterior forward than any other rim providing protection covered by thin layer of tissue.
Superior Orbital Margin (supraorbital margin)
concave dip between forehead & cheekbone that is formed by process of zygomatic bone & frontal bone.
Lateral Orbital Margin (zygomaticofrontal process)
inferior margin simulates a sigmoid “S” curve from nose to check
Inferior Orbital Margin (maxilla & zygomatic bones)
serves a guide for hypodermic tissue building (filling) behind the eyeball
Medial Orbital Margin (frontal process of maxilla)
Eyelids •Superior Palpebra (upper eyelid) •Inferior Palpebra (lower eyelid) •Palpebrae = eyelids •palpebral = eyelid •Closed eyes are “Almond” shape •2 lids “abut” & not overlap when close •medial end is superior to lateral end;
1
fold of tissue that extend from upper most portion of eyeball down to bottom of iris and its greatest height is medially off center
Superior Palpebra (upper eyelid):
form closely to convexity of eyeball and when naturally closed it covers the cornea;
Superior Palpebra (upper eyelid):
fold of tissue that covers lower vertical part of eyeball and is narrower and thinner than upper lid
Inferior Palpebra (lower eyelid):
___ follows the curve of the eyeball and inclines from the line of closure. It has less convexity, less anterior projection and less width
Inferior Palpebra (lower eyelid):
The line that forms between 2 eyelids when they are closed that marks their place of contact with each other.
Line of Closure:
inferior curvature lowest at center of the inferior margin of iris; from profile generally curve with the posterior part moving superiorly & do not see medial end from profile view; its greatest anterior projection & slightly offset medially
Line of Closure:
inverted triangle concave depression superior to the medial portion of the superior palpebrae to inner corner of eye
Nasal Orbital Fossa:
broadest under head of eyebrow; tapered inner corner of eye where nearest & deepest; lies near root of nose
Nasal Orbital Fossa:
Area between the supercilium (eyebrow) and the superior palpebrae (eyelid); composed of muscle and fat; it is deepest near the root of the nose
SupraOrbital area:
small elevation extending medially & obliquely from medial corner of superior palpebrae;
Inner Canthus (medial):
No eyelashes here; point of entry for hypodermic tissue building if have to go behind eyeball to project forward
Inner Canthus (medial):
forms lateral terminance of line of closure; upper eyelid portion overlap lateral rim of orbits at its deepest part
Lateral Canthus (outer):
fringe of hair edging the eyelids; thicker than hair on head
Cilia (eyelashes):
Eyebrows which grows obliquely upward and outward and is unequal in length; denser near the glabella; height & thickness
Supercilium (eyebrows):
3 Parts of Supercilium
- Head
- Body
- Tail
medial end located at supercilium eminence within anterior plane of forehead; hair growth more dense
Head of Supercilium