NCLEX : Musculoskeletal System and Anatomy

Study concepts, example questions & explanations for NCLEX

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Example Questions

Example Question #21 : Musculoskeletal System And Anatomy

Which of the following is not a fossa of the scapula?

Possible Answers:

The infraspinatus fossa

The supraspinous fossa

The suprascapular fossa 

The subscapular fossa

Correct answer:

The suprascapular fossa 

Explanation:

The scapula has multiple fossa that serve as attachment points of various bones and muscles of the shoulder. Among these are the glenoid fossa, where the head of the humerus articulates with the scapula, the subscapular fossa, which is an attachment for the subscapularis muscle, the infraspinous fossa, to which the infraspinatus attaches, and the supraspinous fossa, to which the supraspinatus muscle attaches. There is no suprascapular fossa on the scapula.

Example Question #21 : Bone Identification

What is the name of the bone that forms the lower part of the jaw?

Possible Answers:

The mandible

The zygomatic bone

The frontal bone

The maxilla

Correct answer:

The mandible

Explanation:

The bone that forms the lower part of the jaw is the mandible. It is the largest and most inferior bone in the face, and articulates with the temporal bones at the temporomandibular joints. The maxilla forms the upper jaw, while the zygomatic bone forms the cheek and part of the orbit.

Example Question #201 : General Biology

All of the following bones of the skull help form the orbit except __________.

Possible Answers:

the palatine bone

The temporal bone

the sphenoid

the maxilla

Correct answer:

The temporal bone

Explanation:

The orbit is formed by the following bones: the maxilla, the zygomatic bone, the frontal bone, the lacrimal bone, the ethmoid, the sphenoid, and the palatine bone. The temporal bone meets the zygomatic and sphenoid but does not form part of the orbit.

Example Question #502 : Nclex

All of the following bones form the nasal cavity except __________.

Possible Answers:

the maxilla

the sphenoid

the vomer

the nasal bone

Correct answer:

the sphenoid

Explanation:

The nasal cavity is formed by the following bones: the maxilla, the vomer, the nasal bone, the palatine bones, the lacrimal bone, and the ethmoid bone. It is also formed by the nasal conchae and the septal cartilage. The sphenoid forms part of the orbit and multiple sinuses but does not form any art of the nasal cavity directly.

Example Question #22 : Musculoskeletal System And Anatomy

You are taking care of a 22-year old basketball player who fractured his clavicle while playing in a game. Which of the following blood vessels is most likely to be compromised by the fractured bone? 

Possible Answers:

Facial artery

Subclavian artery

Internal carotid artery

Jugular vein

External carotid artery

Correct answer:

Subclavian artery

Explanation:

The correct answer is "subclavian artery." This is the correct answer because what this question is essentially asking is which of the listed blood vessels is closest to the clavicle, and most likely to be injured by a clavicular fracture based upon its proximity to the clavicle. Of the listed vessels, the subclavian artery is located closest to the clavicle (just inferior to the clavicle bone, as the name, sub-clavian implies). As such, if the clavicle breaks and a sharp fragment is formed, it would be most likely to injure the subclavian artery. 

The internal and external carotid arteries, and jugular vein are located within the neck, but more deep and superior to the clavicle than the subclavian artery. The facial artery is located within the face and as such is located very superiorly to the clavicle bone and is unlikely to be involved by a clavicle fracture.

Example Question #1 : Muscle Identification

The frontalis muscle does which of the following actions?

Possible Answers:

Raises the eyebrows

Furrows the brow

Lowers the eyelids

Lifts the eyelids

Correct answer:

Raises the eyebrows

Explanation:

The frontalis muscle lifts the eyebrows and wrinkles the forehead. The brow is furrowed by the corrugator supercilii muscle, and the eye lids are raised by the levator palpebrae superioris and lowered by the orbicularis oculi.

Example Question #21 : Musculoskeletal System And Anatomy

What is the insertion of the masseter?

Possible Answers:

The coronoid process of the mandible

The mandibular condyle

The submandibular fossa of the jaw

The temporal bone

Correct answer:

The coronoid process of the mandible

Explanation:

The masseter is a quadrilateral muscle that originates from the zygomatic arch and maxilla and inserts into the coronoid process of the mandible. It's function is to lift the mandible, closing the jaw. 

 

Example Question #1 : Muscle Identification

What is the function of the risorius?

Possible Answers:

Keeps food between the teeth

Retracts the angle of the mouth (smiling)

Depresses the lower lip

Purses the lips

Correct answer:

Retracts the angle of the mouth (smiling)

Explanation:

The risorius is a small facial muscle that originates on the parotic fascia and inserts into the modiolus. It's primary action is to retract the corners of the mouth in smiling. The lips are pursed by the orbicularis oris. The mouth is compressed and food is kept between the teeth by the buccinator muscle. The lower lip is depressed by the depressor labii inferioris.

Example Question #2 : Muscle Identification

What are the origin and insertion of the orbicularis oris?

Possible Answers:

The temporomandibular joint; the buccinator

The maxilla and mandible; the skin of the lips

The zygomatic arch; the modiolus

The mandibular condyle; the fascia of the masseter

Correct answer:

The maxilla and mandible; the skin of the lips

Explanation:

The orbicularis oris, a circular muscle that compresses the lips, originates on the maxilla and mandible and inserts into the skin of the lips

Example Question #22 : Musculoskeletal System And Anatomy

Which of the following muscles assists in frowning?

Possible Answers:

The temporoparietalis muscle

The auricular muscles

The depressor anguli oris

The depressor supercilii 

Correct answer:

The depressor anguli oris

Explanation:

The depressor anguli oris is a small triangular muscle that originates on the mandible and inserts into the modiolus. It's main action is to lower the corners of the mouth in frowning. The auricular muscles are a part of the inner ear. The temporoparietalis muscle is a thin muscle covering the temporal bone, and the depressor supercilii is a muscle of the eye.

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