NCLEX : Muscle Identification

Study concepts, example questions & explanations for NCLEX

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Example Questions

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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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