The nurse is reviewing the development of the newborn infant. Regarding the sinuses, which statement is true in relation to a newborn infant?

Maxillary sinuses reach full size after puberty.

Maxillary and ethmoid sinuses are the only sinuses present at birth.

Frontal sinuses are fairly well developed at birth.

Sphenoid sinuses are full size at birth.

Answer and Explanation

The Correct Answer is B

A. Maxillary sinuses reach full size after puberty: While maxillary sinuses continue to grow throughout childhood, they are present at birth and reach adult size during late adolescence. The frontal and sphenoid sinuses, rather than the maxillary, experience more significant postnatal development.

B. Maxillary and ethmoid sinuses are the only sinuses present at birth: At birth, only the maxillary and ethmoid sinuses are developed. The frontal and sphenoid sinuses begin to develop later in infancy and childhood, with full maturation occurring in adolescence.

C. Frontal sinuses are fairly well developed at birth: Frontal sinuses do not develop until around 7 to 8 years of age and continue growing into adolescence. They are absent or rudimentary in newborns.

D. Sphenoid sinuses are full size at birth: The sphenoid sinuses begin developing around 2 to 3 years of age and continue growing into late childhood and adolescence. They are not present at birth.

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Correct Answer is B

Explanation

A. Mitral and pulmonic: The mitral valve closure is best heard at the apex of the heart (the left fifth intercostal space) rather than at the base. The pulmonic valve is indeed located near the base but, combined with the mitral valve, does not represent the sounds best heard at the base of the heart.

B. Aortic and pulmonic: The aortic and pulmonic valves are located at the base of the heart. The aortic valve is located in the right second intercostal space at the sternal border, while the pulmonic valve is located in the left second intercostal space. The closure of these valves (S2) is typically loudest at this area, making this option correct.

C. Mitral and tricuspid: The mitral valve is best heard at the apex, and the tricuspid valve is best heard along the left lower sternal border. Both valves are not located at the base of the heart.

D. Tricuspid and aortic: The tricuspid valve is not located at the base of the heart; it is situated along the left lower sternal border, while the aortic valve is at the base. Therefore, this combination does not represent the best valves to listen for at the base.

A. II B. VI C. III D. IV

Correct Answer is C

Explanation

A. II: The optic nerve (cranial nerve II) is responsible for vision, including visual acuity and the afferent limb of the pupillary reflex. Damage to this nerve causes vision loss or visual field defects but does not affect eye movement or positioning.

B. VI: The abducens nerve (cranial nerve VI) innervates the lateral rectus muscle, which abducts the eye. Damage to this nerve results in an inability to move the eye laterally, leading to horizontal diplopia, but it does not cause a "down and out" eye position.

C. III: The oculomotor nerve (cranial nerve III) controls most of the extraocular muscles, including the superior, inferior, and medial rectus muscles, as well as the inferior oblique. It also controls the levator palpebrae superioris and the parasympathetic fibers responsible for pupillary constriction. Damage to cranial nerve III results in ptosis, a "down and out" eye position due to unopposed action of the lateral rectus (cranial nerve VI) and superior oblique (cranial nerve IV), and potentially a dilated pupil.

D. IV: The trochlear nerve (cranial nerve IV) innervates the superior oblique muscle, which depresses and internally rotates the eye. Damage to this nerve typically causes vertical diplopia and difficulty looking downward, especially when reading or descending stairs, but it does not cause a "down and out" eye position at rest.

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The nurse is reviewing the development of the newborn infant. Regarding the sinuses, which statement is true in relation to a newborn infant?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

When listening to heart sounds, which valve closures are heard best at the base of the heart?

Correct Answer is B

Explanation

The nurse is assessing a 12 year old with new onset of double vision. The nurse notes the child's right eye is positioned down and out. The nurse knows these findings are suggestive of damage to cranial nerve

Correct Answer is C

Explanation

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