Question 1

The midline partition of bone and cartilage that divides the nasal cavity into right and left portions is the _______________________.

Accepted Answer

Septum. The midline partition of the nasal cavity, or septum, that divides the nasal cavity into right and left portions is composed of bone and cartilage. The nares are the nostrils.

Question 2

The ________ is the firm, smooth, fibrous outer covering of the posterior five sixths of the eyeball.

Accepted Answer

Sclera. The sclera is a firm, smooth, fibrous outer covering of the posterior five sixths of the eyeball. The iris is the pigmented diaphragm of the eyeball. The ciliary body surrounds the lens and suspends the lens via the suspensory ligament.

Question 3

Which nerve supplies all the structures that arise from the mandibular process?

Accepted Answer

Cranial nerve V-3. Cranial nerve V-3 (mandibular nerve) is the nerve of the mandibular process of the first branchial arch and supplies all the structures that arise from the mandibular process.

Question 4

Innervation of the temporomandibular joint is provided primarily by the _____ nerve.

Accepted Answer

Auriculotemporal. Most of the temporomandibular joint is supplied by sensory articular branches of the auriculotemporal nerve.

Question 5

Which of the following are muscles of mastication?

Accepted Answer

Masseter, temporalis, and pterygoid. The muscles of mastication are the masseter (superficial head and deep head), temporalis, and pterygoid (medial and lateral).

Question 6

The largest, and perhaps most troublesome, of the paranasal air sinuses are the _____ sinuses.

Accepted Answer

Maxillary. The paired maxillary sinuses are the largest and clinically, perhaps, the most troublesome of the paranasal air sinuses. They lie within the bodies of the right and left maxillae. The maxillary sinus drains to the middle meatus of the nose through its ostium, which sometimes is chronically blocked.

Question 7

The floor of the nasal cavity is the _______________________.

Accepted Answer

Hard palate. The floor of the nasal cavity is the hard palate.

Question 8

The functions of the nose and nasal cavity are respiration, olfaction, filtration, reception of secretions from paranasal air sinuses, and __________________.

Accepted Answer

Humidification of inspired air and reception of secretions from the nasolacrimal duct of the orbit. The functions of the nose and nasal cavity are respiration, olfaction, filtration of particulate matter, humidification of inspired air, and reception of secretions from communicating paranasal air sinuses and from the nasolacrimal duct of the orbit. Vocalization is accomplished in the larynx.

Question 9

The ___________ muscle is used as a landmark to divide the maxillary artery into three parts: (1) the portion before the muscle, (2) the portion passing over the muscle, and (3) the part after crossing the muscle.

Accepted Answer

Lateral pterygoid. The lateral pterygoid muscle is used as a landmark to divide the maxillary artery into three parts: part 1 is the portion before the muscle, part 2 is the portion passing over the muscle, and part 3 is the portion after crossing the muscle.

Question 10

The pterygopalatine fossa is seen through a narrow cleft, the _____________, between the pterygoid process of the sphenoid bone and the posterior wall of the maxilla.

Accepted Answer

Pterygomaxillary fissure. The pterygopalatine fossa is located on the lateral aspect of the skull and is best seen with the zygomatic arch removed. The fossa is seen through a narrow cleft, the pterygomaxillary fissure, between the pterygoid process of the sphenoid bone and the posterior wall of the maxilla.

Question 11

The _____________ marks the injection site for local anesthesia of the inferior alveolar nerve.

Accepted Answer

Retromolar fossa. The retromolar fossa marks the injection site for local anesthesia of the inferior alveolar nerve.

Question 12

The venous flow from areas supplied by the maxillary artery to the maxillary vein is through a complex configuration of tributaries called the __________________________.

Accepted Answer

Pterygoid plexus of veins. The venous flow from areas supplied by the maxillary artery does not return in a simple fashion to the maxillary vein. Rather, the tributaries form a complex configuration termed the pterygoid plexus of veins.

Question 13

The oral cavity consists of which two areas?

Accepted Answer

Vestibule and oral cavity proper. The oral cavity consists of two areas. The vestibule is the space between the teeth and the inner mucosal lining of the lips and cheeks. The oral cavity proper is the space contained within the upper and lower dental arches.

Question 14

The ________ nerve branches from the inferior alveolar nerve and passes to the face through the mental foramen. It sends branches to supply the skin and mucous membrane of the lower lip, the skin of the chin, and the vestibular gingiva of the mandibular incisors.

Accepted Answer

Mental. The mental nerve branches from the inferior alveolar nerve and passes to the face through the mental foramen. It sends branches to supply the skin and mucous membrane of the lower lip, the skin of the chin, and the vestibular gingiva of the mandibular incisors.

Question 15

Which of the following is an accurate description of how the eye focuses?

Accepted Answer

For faraway objects, the elastic suspensory ligament holds the lens taut, thus flattening the lens. For nearby objects, the eyeballs turn inward, the pupillae muscle lets less light enter the eyeball, and the suspensory ligament loosens to allow the lens to relax and assume its normal shape.

Question 16

The position of the mandible in which freeway space is closed and the teeth come into maximal contact in the midline is referred to as _________________.

Accepted Answer

Centric occlusion. Centric occlusion is achieved on closing the freeway space and allowing the teeth to come into maximal contact in the midline. The rest position is achieved when several millimeters separate the occlusal surfaces and the condyles rest on the posterior slope of the articular eminence.

Question 17

Articulation of the temporomandibular joint takes place in which of the following two areas?

Accepted Answer

Articulation of the temporomandibular joint takes place in two areAnswer: (1) between maxillary and mandibular teeth and (2) between the mandibular condyle and the temporal bone.

Question 18

The _______ nerve passes into the parotid gland and becomes plexiform and forms five sets of branches-temporal, zygomatic, buccal, mandibular, and cervical-that supply the superficial muscles of facial expression and the platysma muscle.

Accepted Answer

Facial. The facial nerve (cranial nerve VII) passes into the parotid gland and becomes plexiform and forms five sets of branches: temporal, zygomatic, buccal, mandibular, and cervical. These radiate from the anterior and inferior borders of the gland to spill onto the face and supply the superficial muscles of facial expression and the platysma muscle.

Question 19

The last branch to arise from the maxillary nerve within the pterygopalatine fossa is the _____________ nerve. It descends along the infratemporal surface of the maxilla, and its branches enter the maxillary sinus.

Accepted Answer

Posterior superior alveolar. The posterior superior alveolar nerve is the last branch to arise from the maxillary nerve within the pterygopalatine fossa. It descends along the infratemporal surface of the maxilla and enters the perforated area of the infratemporal surface as several branches, which pass through the posterior superior alveolar foramina and enter the maxillary sinus.

Question 20

The __________ nerve is the second of three large divisions to arise from the trigeminal ganglion within the middle cranial fossa. It follows a complicated course through four regions of the head and gives rise to sensory branches as it passes through each region.

Accepted Answer

Maxillary. The maxillary nerve is the sensory supply to all the eventual derivatives of the maxillary process. It is the second of three large divisions to arise from the trigeminal ganglion within the middle cranial fossa. It follows a complicated course through four regions of the head.

Quiz 7: The Head by Regions