Anatomy of the Eye: Eyelids and Lacrimal Apparatus

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What is the primary location of the refractive power in the eye?

Lens itself

Posterior surface of the iris

Anterior surface of the cornea (correct)

Ciliary body

What is the function of the tear film in relation to the cornea?

To reduce the flow of aqueous humor

To regulate the pupil size

To maintain the normal environment for the corneal epithelial cells (correct)

To increase the refractive power of the cornea

What is the structure that connects the ciliary processes to the lens?

Suspensory ligaments (correct)

Meridianal fibers

Ciliary striae

Ciliary ring

What type of nerve fibers supply the ciliary muscle?

Parasympathetic fibers Signup and view all the answers

What is the effect of contraction of the ciliary muscle on the lens?

The lens becomes more convex Signup and view all the answers

What is the location of the ciliary body in relation to the iris?

Behind the peripheral margin of the iris Signup and view all the answers

What is the name of the small space that separates the medial angle of the eyelid from the eyeball?

Lacus lacrimalis Signup and view all the answers

What is the function of the punctum lacrimale?

To carry tears into the nose Signup and view all the answers

What is the name of the fibrous sheet that forms the framework of the eyelids?

Orbital septum Signup and view all the answers

What is the name of the potential space that is formed by the reflection of the conjunctiva onto the anterior surface of the eyeball?

Conjunctival sac Signup and view all the answers

What is the name of the small, reddish yellow elevation located in the center of the lacus lacrimalis?

Caruncula lacrimalis Signup and view all the answers

What is the clinical importance of the subtarsal sulcus?

It traps small foreign particles Signup and view all the answers

What is the main function of the lens in the eye?

To contribute slightly to the magnifying power of the eye Signup and view all the answers

What is the purpose of the suspensory ligament in the eye?

To keep the elastic lens flattened for distant vision Signup and view all the answers

What happens to the shape of the lens when the ciliary muscle contracts?

It becomes more globular Signup and view all the answers

What is the function of the ciliary processes in the eye?

To encircle the lens and provide support Signup and view all the answers

What is the primary component of the lens?

Lens fibers Signup and view all the answers

What is the purpose of the cuboidal epithelium in the lens?

To form the lens fibers Signup and view all the answers

What is the narrowest part of the larynx in a male adult?

The glottis Signup and view all the answers

What is the function of the thyroepiglottic muscle?

Widening the laryngeal inlet Signup and view all the answers

What is the purpose of the mucous secretion produced by the saccule of the larynx?

To lubricate the vocal cords Signup and view all the answers

What is the region of the larynx situated between the vestibular folds and the vocal folds?

Middle region Signup and view all the answers

Which muscles move the larynx up and down during swallowing?

Extrinsic muscles Signup and view all the answers

What is the narrowest part of the larynx in children?

The lower part of the larynx within the cricoid cartilage Signup and view all the answers

Which pharyngeal pouch do the inferior parathyroid glands develop from?

Third pharyngeal pouch Signup and view all the answers

Where do the superior parathyroid glands finally come to rest?

On the posterior surface of the lateral lobe of the thyroid gland Signup and view all the answers

What is the arterial supply to the parathyroid glands?

Superior and inferior thyroid arteries Signup and view all the answers

What type of cells appear in the parathyroid glands in late childhood?

Acidophilic cells Signup and view all the answers

What is the venous drainage of the parathyroid glands?

Into the superior, middle, and inferior thyroid veins Signup and view all the answers

Where can the parathyroid glands sometimes be found?

Some distance caudal to the thyroid gland, in association with the inferior thyroid veins Signup and view all the answers