NCLEX : Musculoskeletal System and Anatomy

Study concepts, example questions & explanations for NCLEX

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Example Questions

Example Question #31 : Musculoskeletal System And Anatomy

Which of the following muscles controls the amplitude of sound waves in the inner ear?

Possible Answers:

The ciliary muscles

The lateral rectus

The auriculares

The stapedius

Correct answer:

The stapedius

Explanation:

The stapedius, the smallest muscle in the human body, controls the amplitude of sound vibrations pulling on the neck of the stapes.The auriculares move the ears. The ciliary muscle and the lateral rectus are both muscles of the eye.

Example Question #31 : Musculoskeletal System And Anatomy

What is the action of the superior oblique muscle of the eye?

Possible Answers:

Elevates the eyelid

Externally rotates the eye

Elevates the eye

Depresses and internally rotates the eye

Correct answer:

Depresses and internally rotates the eye

Explanation:

The superior oblique originates on the annulus of Zinn and inserts into the outer posterior eye. It's action is to depress and internally rotate the eye. 

Example Question #31 : Musculoskeletal System And Anatomy

Which of the following innervates the platysma?

Possible Answers:

The facial nerve (CN VII)

The mylohyoid nerve

The motor accessory nerve

The vagus nerve

Correct answer:

The facial nerve (CN VII)

Explanation:

The platysma, a sheet-like muscle that traverses the neck from the clavicle to the mouth and jaw, is innervated by the cervical branch of the facial nerve (CN VII).

Example Question #31 : Musculoskeletal System And Anatomy

Which of the following muscles has its origin on the mastoid process of the temporal bone?

Possible Answers:

The splenius capitis

The rectus capitis posterior minor

The rectus capitis posterior major

The semispinalis capitis

Correct answer:

The splenius capitis

Explanation:

The splenius capitis, one of the main extenders of the neck, has it's origin on the mastoid process of the temporal bone. The rectus capitis posterior minor, the rectus capitis posterior major, and the semispinalis capitis all originate on the nuchal line of the occipital bone.

Example Question #32 : Musculoskeletal System And Anatomy

What are the main muscles responsible for keeping an upright spinal position?

Possible Answers:

The latissimus dorsi

The rhomboids

The erector spinae

The levatores costarum

Correct answer:

The erector spinae

Explanation:

While all of the muscles listed are part of the structure and mobility of the back, the main muscle group responsible for maintaining erect posture in the erector spinae. 

Example Question #31 : Musculoskeletal System And Anatomy

Which of the following is not a part of the erector spinae muscle group? 

Possible Answers:

The longissimus

The iliocostalis

The trapezius

The spinalis

Correct answer:

The trapezius

Explanation:

The main muscle groups that make up the erector spinae are the iliocostalis muscles, the longissimus muscles, and the spinalis. The trapezius is not a part of the erector spinae group.

Example Question #32 : Musculoskeletal System And Anatomy

Which of the following is a muscle of mastication?

Possible Answers:

The temporalis

The lateral pterygoid

The medial pterygoid

All of these

Correct answer:

All of these

Explanation:

Mastication relies on four major muscles: the masseter, the temporalis, the medial pterygoid, and the lateral pterygoid.

Example Question #31 : Musculoskeletal System And Anatomy

Which of the following cranial nerve (CN) innervates the genioglossus?

Possible Answers:

CN XII (the hypoglossal nerve)

CN IX (the glossopharyngeal nerve)

CN VII (the facial nerve)

CN IV (the trochlear nerve)

Correct answer:

CN XII (the hypoglossal nerve)

Explanation:

The genioglossus, the main muscle that protrudes the tongue, is innervated by the hypoglossal nerve, or CN XII.

Example Question #31 : Musculoskeletal System And Anatomy

What is the origin of the inferior oblique muscle of the eye?

Possible Answers:

The maxilla

The infra-orbital margin

The sphenoid bone

The annulus of Zinn

Correct answer:

The maxilla

Explanation:

The inferior oblique muscle of the eye, an extrinsic muscle that externally rotates and abducts the eye, has it's origin on the orbital surface of the maxilla.

Example Question #33 : Musculoskeletal System And Anatomy

What is the action of the sternocleidomastoid?

Possible Answers:

Laterally flex the neck

All of these are correct

Accessory respiratory muscle

Extend the neck

Correct answer:

All of these are correct

Explanation:

The sternocleidomastoid, a long muscle that originates on the manubrium and the clavicle and inserts into the mastoid process, has several functions: when functioning unilaterally, it rotates the head, flexes the neck, and laterally flexes the neck. When functioning bilaterally, this muscle also extends the neck and is an accessory respiratory muscle.

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