Anatomy and Physiology 101Lab 13

Ear and Eye AnatomyLab Exercise and Report 32Lab Exercise and Report 34

Textbook figures 12.9-.10 and 12.22-.26, .30

The objective for this lab is to learn the anatomy of the eye and the ear using the models and diagrams.

Anatomy of the Ear

External earAuricleExternal auditory canal (meatus)

Middle earTympanic cavity (space that contains the middle ear structures)Tympanic membraneMiddle Ear Ossicles

MalleusIncusStapes

Eustachian (auditory) tube

Inner earOval window (shown on models connected to stapes)VestibuleSemicircular canalsCochlea

Round windowVestibulocochlear (auditory) nerve- cranial nerve VIII

Anatomy of the Eye Eyelid (palpebrae)Lacrimal apparatus

Lacrimal glandLacrimal sac

Muscles associated with the eyeOrbicularis oculi- surrounds eyeLevator palpebrae superioris- muscle in upper eyelid

Extrinsic eye muscles- allow for voluntary eye movement, controlled by cranial nerves III, IV, VI

Superior rectus- rolls eye upInferior rectus- rolls eye downLateral rectus-rolls eye outwardMedial rectus- rolls eye inwardSuperior oblique-rolls eye downInferior oblique- rolls eye up

Outer tunic (layer)Sclera- whiteCornea- transparent

Middle tunic (layer)Choroid coat- darkCiliary body with ciliary musclesSuspensory ligamentsLens- transparentIris- color variesPupil- hole in iris, allows light waves to reach retina, size of pupil is determined by iris

Inner tunic (layer)Retina- contains the photoreceptors called rods and cones; rods detect light and dark while cones detect color

Optic disk (blind spot)Fovea centralis (focal point)

Cavities within the eyeAnterior cavity-located in front of the lens and contains aqueous humor

Anterior chamber- between cornea and iris. Drains the aqueous humor (via canal of Schlemm)

Posterior chamber- between iris and lens. Produces the aqueous humor (via ciliary processes).

Posterior cavity- located between the lens and the retina, contains vitreous humor

Optic nerve- cranial nerve II

Students who are interested may also perform the sheep eye dissection as described in the lab manual.

Complete Lab Reports 32 and 34

auricle

external acoustic meatus

tympanic membrane

LAB 13: Ear and Eye anatomy

Activity 1. Identify the Parts of the Ear

semicircular canals

tympanic membrane

incus

vestibulocochlear nerve

cochlea

vestibule

malleus

stapes

lacrimal gland

tympanic membrane

Round window (not visible from this angleActivity 2. Identify the parts of the Eye

2a. Lacrimal Apparatus

lacrimal canaliculi

puncta

lacrimal sac

nasolacrimal duct

cochlea

semicircular canals

vestibule

oval window (stapes removed)

lacrimal canal

Extrinsic Eye Muscles

superior oblique

lateral rectus

superior rectus

levator palpebrae superioris

inferior rectus

inferior oblique

medial rectus

levator palpebrae superioris

medial rectus

superior oblique

inferior rectusinferior oblique

superior rectus (cut)

lateral rectus (cut)

Outer layer of Eye

Middle layer of Eye

sclera

Cornea

choroid coat

iris

pupil

ciliary muscle

lens

ciliary body(dark red)

suspensory ligaments (white lines)

Inner Layer of Eye

Spaces within the Eye

optic nerve

retina

optic disc

fovea centralis

posterior cavity

anterior chamber

posterior chamber

anterior cavity

iris

vitreous humor

optic disc

macula

lens