Where is the middle meatus located?
The middle meatus is an air passage of the lateral nasal cavity located between the middle nasal concha and lateral nasal wall. The anterior ethmoid air cells, maxillary and frontal sinuses all drain into the middle meatus. 1.
Where is the superior meatus located and what is its function?
It is a narrow cavity located obliquely below the superior concha. This meatus is short, lies above and extends from the middle part of the middle concha below. From behind, the sphenopalatine foramen opens into the cavity of the superior meatus and the meatus communicates with the posterior ethmoidal cells.
What is the middle meatus of the nose?
The middle meatus is an air passage of the lateral nasal cavity located between the middle nasal concha and lateral nasal wall. The anterior ethmoid air cells, maxillary and frontal sinuses all drain into the middle meatus. 1. Peter S. Hechl, Reuben C. Setliff, Manfred Tschabitscher.
Which is the smallest meatus in the human body?
The superior meatus, located between the superior concha and the middle concha, is the smallest among the three meatuses. The posterior ethmoidal cells open into the front part of the superior meatus while the opening of the sphenopalatine foramen is behind it.
What drains into the inferior meatus?
The inferior meatus (plural: meatus) is an air passage of the lateral nasal cavity located between the inferior nasal concha and lateral nasal wall. The nasolacrimal duct drains into the inferior meatus, and Woodruff plexus is located posteriorly.
What opens into superior nasal meatus?
The superior meatus, the smallest of the three meatuses of the nose, occupies the middle third of the lateral wall of the nasal cavity. It lies between the superior nasal conchæ and middle nasal conchæ; the sphenopalatine foramen opens into it behind, and the posterior ethmoidal cells in front.
What important openings are found in some of the meatuses?
The external auditory meatus are slitlike openings that are closed by a large superior and smaller inferior flap and are protected by a dorsal shelf of bone (Fig. 10.10). The fibrous flaps serve to close the external opening when the animal submerges.
At what site does the maxillary sinus open into the middle meatus?
The first, the maxillary ostium, is located on the superomedial aspect of the maxillary sinus. The ostium leads into the second passage, the ethmoid infundibulum, that conducts mucus from the maxillary sinus into the middle meatus via the third passage, the hiatus semilunaris.
What is the function of middle meatus?
The middle meatus is the nasal passageway that lies between the inferior meatus and the middle meatus. This space is important for: Drainage of three of the paranasal sinuses; the maxillary, frontal, and front (anterior) ethmoid sinuses. Airflow through the paranasal sinuses which creates the tones of our voices.
Which one of the following opens into the inferior meatus of the nose?
The inferior meatus is below and lateral to the inferior nasal concha; the nasolacrimal duct opens into this meatus under cover of the anterior part of the inferior concha.
What is inside the meatus?
From your two kidneys, two ureters move the urine to the bladder, where it's stored until you urinate (pee). Urine leaves your body through a hole at the end of your urethra. That hole from the inside to the outside is called the urethral meatus. (The term 'meatus' refers to any opening from the inside to the outside.)
What is the difference between meatus and conchae?
The conchae divide the nasal cavity into nasal ducts or meatuses, which branch out from a common nasal meatus which is adjacent to the nasal septum.
How many meatus are there?
threeGross anatomy There are three main nasal meatuses: superior meatus. middle meatus. inferior meatus.
Where is the opening to the maxillary sinus?
semilunar hiatusThe opening of the maxillary sinus is near the top of the base, in the center of the semilunar hiatus, which grooves the lateral wall of the middle nasal meatus. Relationships of the maxillary sinus are as follows: The superolateral surface (roof) is related above to the orbit.
Where does frontal sinus open?
Each opens into the anterior part of the corresponding middle nasal meatus of the nose through the frontonasal duct which traverses the anterior part of the labyrinth of the ethmoid. These structures then open into the semilunar hiatus in the middle meatus.
Where do the paranasal sinuses open into?
middle nasal meatusThey are the most superior paranasal sinuses, situated deep to the superciliary arches and the root of the nose. The frontal sinuses are drained via the frontonasal duct to the ethmoidal infundibulum. This infundibulum then opens into the middle nasal meatus via the semilunar hiatus.
Which sinus opens into superior nasal meatus?
The superior meatus drains for the sphenoid and posterior ethmoid sinuses.
Which cranial nerve is located in the superior meatus?
Trigeminal nerves (V) Ophthalmic nerve (V1)—sensory, from the orbital structures, cornea, nasal cavity, forehead skin, supper eyelid, eyebrow, and part of the nose; passing through the superior orbital fissure.
What opens into the Sphenoethmoidal recess?
The sphenoidal sinus opens into the sphenoethmoidal recess of the nasal cavity. The floor of the sinus is in the roof of the nasal cavity and the nasopharynx.
What opens into the nasopharynx?
The openings from the two nasal cavities into the nasopharynx (here's the right one) are called the choanae, or posterior nares.
Where are the meatuses located?
Nasal meatuses are the anteroposterior passages located on the lateral wall of the human nasal cavity. Connected To: Nasal cavity. There are three meatuses varying in size, namely the superior, middle and the inferior meatus [2]. Nasal Meatus Anatomy.
Where is the superior meatus located?
Superior meatus. The superior meatus, located between the superior concha and the middle concha, is the smallest among the three meatuses. The posterior ethmoidal cells open into the front part of the superior meatus while the opening of the sphenopalatine foramen is behind it.
What is the bony projection of the ethmoidal bulla?
It has a bony projection known as the ethmoidal bulla, which contains the middle ethmoidal cells. The uncinate process, a horn-shaped bony projection, is located beneath this bulla. The ethmoidal infundibulum, containing the fronto-nasal duct leads to this process while the duct is connected with the frontal sinus, ...
Where is the half moon hiatus located?
The half moon shaped semi-lunar hiatus is located between the ethmoidal bulla and uncinate process , with the frontal sinus, maxillary sinus and the anterior and middle ethmoid air cells opening into it [2]. Nasal Meatus.
Where is the inferior meatus?
The inferior meatus is the largest of the three. It lies below the inferior concha and above the nasal cavity. It extends most of the length of the nasal cavity’s lateral wall. It is broader in the front than at the back, and presents anteriorly the lower orifice of the nasolacrimal canal .
Where is the superior meatus located?
The superior meatus occupies the middle third of the nasal cavity’s lateral wall. The middle meatus is the middle-sized and located nasal opening, lying underneath the middle concha and above the inferior concha where the meatus extends along its length.
What is the nasal meatus?
In anatomy, the term nasal meatus can refer to any of the three meatuses (passages) through the skull ' s nasal cavity: the superior meatus ( meatus nasi superior ), middle meatus ( meatus nasi medius ), and inferior meatus ( meatus nasi inferior ).
Which part of the meatus communicates with the anterior ethmoidal cells?
Through the hiatus semilunaris the meatus communicates with a curved passage termed the infundibulum, which communicates in front with the anterior ethmoidal cells and in rather more than fifty percent of skulls is continued upward as the frontonasal duct into the frontal air-sinus; when this continuity fails, the frontonasal duct opens directly into the anterior part of the meatus.
Where are the nasal meatuses located?
The nasal meatuses are located beneath each of the corresponding nasal conchae. In the case where a fourth, supreme nasal concha is present, there is a fourth supreme nasal meatus .
