Podcast
Questions and Answers
What is the function of the zonular fibres in the eyeball?
What is the function of the zonular fibres in the eyeball?
- To regulate the amount of light entering the eyeball through the pupil
- To consist of melanocytes and give color to the iris
- To attach to the lens and alter its shape for near or far vision (correct)
- To secrete aqueous humor to nourish the lens
Which structure in the eyeball contains circular and radial smooth muscle fibers?
Which structure in the eyeball contains circular and radial smooth muscle fibers?
- Retina
- Ciliary processes
- Choroid
- Iris (correct)
What gives color to the iris of the eye?
What gives color to the iris of the eye?
- Presence of melanocytes (correct)
- Suspensory ligaments attached to the lens
- Amount of blood capillaries
- The pigmented and neural layers of the retina
What is the role of autonomic reflexes in regulating the size of the pupil?
What is the role of autonomic reflexes in regulating the size of the pupil?
What type of epithelium makes up the conjunctiva?
What type of epithelium makes up the conjunctiva?
What is the function of the lacrimal fluid produced by the lacrimal glands?
What is the function of the lacrimal fluid produced by the lacrimal glands?
Which nerve supplies the lacrimal gland with parasympathetic fibers?
Which nerve supplies the lacrimal gland with parasympathetic fibers?
Which muscles attach the eyeball to the wall of the bony orbits and are surrounded by periorbital fat?
Which muscles attach the eyeball to the wall of the bony orbits and are surrounded by periorbital fat?
Which nerve supplies the skeletal muscle responsible for limiting movement and increasing tension on the eardrum to prevent damage from loud noises?
Which nerve supplies the skeletal muscle responsible for limiting movement and increasing tension on the eardrum to prevent damage from loud noises?
What type of tissue is found between the epithelial layers in the middle ear?
What type of tissue is found between the epithelial layers in the middle ear?
What fluid is chemically similar to cerebrospinal fluid and surrounds the membranous labyrinth in the internal ear?
What fluid is chemically similar to cerebrospinal fluid and surrounds the membranous labyrinth in the internal ear?
What separates the middle ear from the external ear and contains two small openings (oval window and round window)?
What separates the middle ear from the external ear and contains two small openings (oval window and round window)?
Study Notes
Eyeball Structure and Function
- Zonular fibers hold the lens in place and adjust its shape for focusing.
- The iris contains circular and radial smooth muscle fibers.
- The iris gets its color from pigmented cells called melanocytes.
Pupil Regulation
- Autonomic reflexes regulate the size of the pupil, constricting in bright light and dilating in low light.
Conjunctiva and Lacrimal Glands
- The conjunctiva is made up of stratified columnar epithelium.
- Lacrimal fluid, produced by the lacrimal glands, lubricates and protects the eye.
Lacrimal Gland Innervation
- The lacrimal gland receives parasympathetic fibers from the VII (facial) nerve.
Extraocular Muscles
- The extraocular muscles (rectus, obliques, and levator palpebrae) attach the eyeball to the wall of the bony orbits and are surrounded by periorbital fat.
Middle Ear and Eardrum
- The tensor tympani muscle, supplied by the V (trigeminal) nerve, limits movement and increases tension on the eardrum to prevent damage from loud noises.
Middle Ear Structure
- Loose connective tissue is found between the epithelial layers in the middle ear.
Internal Ear
- The membranous labyrinth is surrounded by a fluid chemically similar to cerebrospinal fluid.
- The tympanic membrane separates the middle ear from the external ear and contains two small openings (oval window and round window).
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Description
Test your knowledge of the anatomy of the eye, including the structure of the conjunctiva and the lacrimal apparatus. Identify the different components and their functions.
