which are the largest of the paranasal sinuses quizlet

What is the paranasal sinus?

The Paranasal Sinuses. The paranasal sinuses are air-filled extensions of the respiratory part of the nasal cavity. There are four paired sinuses, named according to the bone in which they are located; maxillary, frontal, sphenoid and ethmoid.

What are the sinuses of the nasal cavity?

They have thin walls which are often penetrated by the long roots of the posterior maxillary teeth. The superior border of this sinus is the bony orbit, the inferior is the maxillary alveolar bone and corresponding tooth roots, the medial border is made up of the nasal cavity and the lateral and anterior border are limited by the cheekbones.

What is the maxillary sinus?

The maxillary sinuses. Anatomy. The maxillary sinuses are the largest of the all the paranasal sinuses. They have thin walls which are often penetrated by the long roots of the posterior maxillary teeth.

How many sinuses are in the frontal bone?

There are two frontal sinuses located within the frontal bone of the skull. They are the most superior of the paranasal sinuses, and are triangular in shape. Drainage is via the frontonasal duct.

Which are the largest of the paranasal sinuses?

The largest of the paranasal sinuses is the maxillary sinus. There are two pyramidal-shaped maxillary sinuses located bilaterally in the maxilla of the face.

What is the largest sinus quizlet?

The largest sinuses are the sphenodial.

What are the paranasal sinuses quizlet?

MatchParanasal Sinuses. para- = near, nas = nose, -al = pertaining to. ... sinus. ... Functions of these sinuses are: ... The four pairs of paranasal sinuses are located on either side of the nose and ; ... Frontal Sinuses. ... Sphenoid Sinuses. ... Maxillary Sinuses. ... Ethmoid Sinuses.

Which paranasal sinus is largest and where it is its meatus?

The maxillary sinuses, the largest of the paranasal sinuses, are under the eyes, in the maxillary bones (open in the back of the semilunar hiatus of the nose). They are innervated by the maxillary nerve (CN V2). The frontal sinuses, superior to the eyes, in the frontal bone, which forms the hard part of the forehead.

What is the largest current quizlet?

The largest current by volume in the oceans is the Antarctic Circumpolar Current. A circular pattern of surface water currents is called a gyre. The Gulf Stream moves water away from the equator; the Benguela Current moves some of this same water back toward the equator.

Which is the largest cavity in the human body quizlet?

The ventral is the larger cavity and is subdivided into two parts (thoracic and abdominopelvic cavities) by the diaphragm, a dome-shaped respiratory muscle. The upper ventral, thoracic, or chest cavity contains the heart, lungs, trachea, esophagus, large blood vessels, and nerves.

What are the 4 paranasal sinuses?

Paranasal sinuses are named after the bones that contain them: frontal (the lower forehead), maxillary (cheekbones), ethmoid (beside the upper nose), and sphenoid (behind the nose).

What bones have paranasal sinuses quizlet?

Four skull bones: maxillary, sphenoid, frontal, and ethmoid contain sinuses which is mucosa-lined air cavities that lead into the nasal passages. These paranasal sinuses lighten the facial bones and act as resonance chambers for speech.

What 4 bones contain paranasal sinuses quizlet?

Which of the following bones contain paranasal sinuses?...sphenoid bone.ethmoid bone.maxillary bones.frontal bone.palatine bone.

Which pair of sinuses are the largest?

There are 4 pairs of the paranasal sinuses:Maxillary sinuses (the biggest)Frontal sinuses.Ethmoidal air cells.Sphenoid sinus.

What are large sinuses?

Maxillary sinuses: These are the largest of the sinuses and are located behind the cheekbones near the maxillae, or upper jaws. Sphenoid sinuses: The sphenoid sinuses are located in the sphenoid bone near the optic nerve and the pituitary gland on the side of the skull.

Which meatus is the largest?

The inferior meatus, the largest of the three meatuses of the nose, is the space between the inferior concha and the floor of the nasal cavity. It extends almost the entire length of the lateral wall of the nose, is broader in front than behind, and presents anteriorly the lower orifice of the nasolacrimal canal.

Which bone contains the largest sinus?

The maxillary sinus is the largest paranasal sinus and lies inferior to the eyes in the maxillary bone. It is the first sinus to develop and is filled with fluid at birth.

Which is the largest sensory organ quizlet?

The skin is the largest sensory organ of the body.

Are the largest of the leukocytes quizlet?

Monocytes are the largest of the leukocytes.

Which artery is the largest and why quizlet?

The aorta is the largest artery in the body. The aorta begins at the top of the left ventricle, the heart's muscular pumping chamber. The heart pumps blood from the left ventricle into the aorta through the aortic valve.

Which cavity forms from the nasal mucosa and communicates with the nasal fossae?

air-containing cavities that form from the nasal mucosa and communicate with the nasal fossae

When are sinuses distinguishable?

these sinuses are distinguishable by age 6 or 7

How many ethmoidal cells are there in the nasal cavity?

this group of the ethmoidal cells vary in number from 2 to 6 or more and drain into the superior nasal meatus

How many walls does a sinus have?

these sinuses are approximately pyramidal in shape and have only 3 walls

What does a resonating chamber do to the voice?

Resonating chamber for the voice Decrease the weight of the skull by containing air Warm & moisten inhaled air Act as shock absorbers in trauma *Possibly control the immune system

Do sinuses vary in size?

these sinuses vary greatly in size and form and occasionally they are absent

Is the sinuses symmetrical?

these sinuses vary considerably in size and shape but are usually symmetric

Which sinuses are separated by the anterior wall?

The anterior wall separates this pair of sinuses from the nasal cavity, as does the hypophyseal fossa, the pituitary gland and the optic chiasm superior ly and the nasopharynx and pterygoid canal inferiorly.

Which sinus is the most posterior?

Laterally, a cavernous sinus exists which is part of the middle cranial fossa and also the carotid artery and cranial nerves III, IV, V/I, V/II and VI can be found.

What is the most posterior sinus in the head?

The most posterior of all the sinuses in the head, the sphenoidal sinuses are large and irregular, just like their septum, which is made by the sphenoid bone. Laterally, a cavernous sinus exists which is part of the middle cranial fossa and also the carotid artery and cranial nerves III, IV, V/I, V/II and VI can be found.

How many pairs of sinuses are there?

They are situated around the nasal cavity and they are all paired and sometimes symmetrical, while always being bilateral. There are four different pairs of sinuses and they are called the: This article will discuss detailed anatomy of the paranasal sinuses.

How many air cells are there on the midline?

On each side of the midline, anywhere from three to eighteen ethmoidal air cells may be grouped together. These air cells are smaller individual sinuses grouped together to form one large one which encompass the anterior, middle and posterior nasal meatuses.

Which sinuses send lymphatic drainage to the submandibular lymph nodes?

The anterior and middle ethmoid sinuses send their lymphatic drainage to the submandibular lymph nodes while the posterior ethmoid sinus sends its own to the retropharyngeal lymph nodes.

Which sinus is superior to the ethmoid sinus?

Anatomy. Superior to the ethmoidal sinus is the anterior cranial fossa and the frontal bone, laterally the orbit can be found, while the nasal cavity is situated medially. The ethmoid sinuses are unique because they are the only paranasal sinuses that are more complex than just a single cavity.

What are the functions of the paranasal sinuses?

The function of the paranasal sinuses is a topic of much debate. Various roles have been suggested: 1 Lightening the weight of the head 2 Supporting immune defence of the nasal cavity 3 Humidifying inspired air 4 Increasing resonance of the voice

Where are the frontal sinuses located?

Frontal Sinuses. There are two frontal sinuses located within the frontal bone of the skull. They are the most superior of the paranasal sinuses, and are triangular in shape. Drainage is via the frontonasal duct. It opens out at the hiatus semilunaris, within the middle meatus of the nasal cavity.

What is the clinical significance of sinusitis?

Clinical Relevance: Sinusitis. As the paranasal sinuses are continuous with the nasal cavity, an upper respiratory tract infection can spread to the sinuses. Infection of the sinuses causes inflammation (particularly pain and swelling) of the mucosa, and is known as sinusitis.

What are the four sinuses?

There are four paired sinuses – named according to the bone in which they are located – maxillary, frontal, sphenoid and ethmoid. Each sinus is lined by a ciliated pseudostratified epithelium, interspersed with mucus-secreting goblet cells.

What nerves are in the nasal cavity?

They are innervated by the posterior ethmoidal nerve (a branch of the ophthalmic nerve), and branches of the maxillary nerve.

What nerve supplies the maxillary sinus?

The maxillary nerv e supplies both the maxillary sinus and maxillary teeth, and so inflammation of that sinus can present with toothache.

Where do the sinuses drain?

All the sinuses therefore drain back into the nasal cavity - openings to the paranasal sinuses can be found on the roof and lateral nasal walls. In this article, we shall look at the anatomy of the paranasal sinuses - their structure, anatomical relations and innervation.