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Depressor septi nasi | |
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Details | |
Origin | Incisive fossa of the maxilla |
Insertion | Nasal septum and back part of the alar part of nasalis muscle |
Nerve | Buccal branch of the facial nerve |
Actions | Depresses nasal septum, constricts nostril, moves apex of nose during movement of upper lip (e.g. talking) |
Identifiers | |
Latin | musculus depressor septi nasi |
TA98 | A04.1.03.012 |
TA2 | 2065 |
FMA | 46777 |
Anatomical terms of muscle |
The depressor septi nasi muscle (or depressor alae nasi muscle) is a muscle of the face. It connects the incisive fossa of the maxilla and the orbicularis oris muscle to the nasal septum of the nose. It draws the ala of the nose downwards, reducing the size of the nostrils.
The depressor septi nasi muscle arises from the incisive foramen of the maxilla. [1] It may also partially originate from the orbicularis oris muscle. [1] Its fibers ascend to be inserted into the nasal septum [1] and back part of the alar part of nasalis muscle.
It lies between the mucous membrane and the muscular structure of the lip.
The depressor septi is a direct antagonist of the other muscles of the nose, drawing the ala of the nose downward, constricting the nostrils.
It works like the alar part of the nasalis muscle.
During rhinoplasty, repositioning of the head of the depressor septi nasi muscle ensures normal nose position after surgery. [2] Various approaches may be used, with similar results. [1]
Rhinoplasty, commonly called nose job, medically called nasal reconstruction is a plastic surgery procedure for altering and reconstructing the nose. There are two types of plastic surgery used – reconstructive surgery that restores the form and functions of the nose and cosmetic surgery that changes the appearance of the nose. Reconstructive surgery seeks to resolve nasal injuries caused by various traumas including blunt, and penetrating trauma and trauma caused by blast injury. Reconstructive surgery can also treat birth defects, breathing problems, and failed primary rhinoplasties. Rhinoplasty may remove a bump, narrow nostril width, change the angle between the nose and the mouth, or address injuries, birth defects, or other problems that affect breathing, such as a deviated nasal septum or a sinus condition. Surgery only on the septum is called a septoplasty.
The nasal bones are two small oblong bones, varying in size and form in different individuals; they are placed side by side at the middle and upper part of the face and by their junction, form the bridge of the upper one third of the nose.
The nasal cavity is a large, air-filled space above and behind the nose in the middle of the face. The nasal septum divides the cavity into two cavities, also known as fossae. Each cavity is the continuation of one of the two nostrils. The nasal cavity is the uppermost part of the respiratory system and provides the nasal passage for inhaled air from the nostrils to the nasopharynx and rest of the respiratory tract.
The nasal septum separates the left and right airways of the nasal cavity, dividing the two nostrils.
In human anatomy, the orbicularis oris muscle is a complex of muscles in the lips that encircles the mouth. It is not a true sphincter, as was once thought, as it is actually composed of four independent quadrants that interlace and give only an appearance of circularity.
The procerus muscle is a small pyramidal slip of muscle deep to the superior orbital nerve, artery and vein. Procerus is Latin, meaning tall or extended.
The nasalis muscle is a sphincter-like muscle of the nose. It has a transverse part and an alar part. It compresses the nasal cartilages, and can "flare" the nostrils. It can be used to test the facial nerve (VII), which supplies it.
The levator labii superioris is a muscle of the human body used in facial expression. It is a broad sheet, the origin of which extends from the side of the nose to the zygomatic bone.
The dilator naris muscle is a part of the nasalis muscle. It has an anterior and a posterior part. It has origins from the nasal notch of the maxilla and the major alar cartilage, and a single insertion near the margin of the nostril. It controls nostril width, including changes during breathing. Its function can be tested as an analogue for the function of the facial nerve (VII), which supplies it.
The superior labial artery is larger and more egregious than the inferior labial artery.
The posterior lacrimal crest is a vertical bony ridge on the orbital surface of the lacrimal bone. It divides the bone into two parts. It gives origin to the lacrimal part of the orbicularis oculi muscle.
The anterior lacrimal crest is a bony projection on the frontal process of the maxilla. It creates the lateral margin of the lacrimal sac fossa and is continuous with the orbital margin. The medial palpebral ligament is attached to anterior lacrimal crest. It is an important structure to avoid damaging during rhinoplasty.
The medial palpebral ligament is a ligament of the face. It attaches to the frontal process of the maxilla, the lacrimal groove, and the tarsus of each eyelid. It has a superficial (anterior) and a deep (posterior) layer, with many surrounding attachments. It connects the medial canthus of each eyelid to the medial part of the orbit. It is a useful point of fixation during eyelid reconstructive surgery.
The major alar cartilage is a thin, flexible plate, situated immediately below the lateral nasal cartilage, and bent upon itself in such a manner as to form the medial wall and lateral wall of the nostril of its own side.
The nasal cartilages are structures within the nose that provide form and support to the nasal cavity. The nasal cartilages are made up of a flexible material called hyaline cartilage in the distal portion of the nose. There are five individual cartilages that make up the nasal cavity: septal nasal cartilage, lateral nasal cartilage, major alar cartilage, minor alar cartilage, and vomeronasal cartilage.
The facial muscles are a group of striated skeletal muscles supplied by the facial nerve that, among other things, control facial expression. These muscles are also called mimetic muscles. They are only found in mammals, although they derive from neural crest cells found in all vertebrates. They are the only muscles that attach to the dermis.
The human nose is the first organ of the respiratory system. It is also the principal organ in the olfactory system. The shape of the nose is determined by the nasal bones and the nasal cartilages, including the nasal septum, which separates the nostrils and divides the nasal cavity into two.
The buccal fat pad is one of several encapsulated fat masses in the cheek. It is a deep fat pad located on either side of the face between the buccinator muscle and several more superficial muscles. The inferior portion of the buccal fat pad is contained within the buccal space. It should not be confused with the malar fat pad, which is directly below the skin of the cheek. It should also not be confused with jowl fat pads. It is implicated in the formation of hollow cheeks and the nasolabial fold, but not in the formation of jowls.
Nasal surgery is a medical procedure designed to treat various conditions that cause nasal blockages in the upper respiratory tract, for example nasal polyps, inferior turbinate hypertrophy, and chronic rhinosinusitis. It encompasses several types of techniques, including rhinoplasty, septoplasty, sinus surgery, and turbinoplasty, each with its respective postoperative treatments. Furthermore, nasal surgery is also conducted for cosmetic purposes. While there are potential risks and complications associated, the advancement of medical instruments and enhanced surgical skills have helped mitigate them.
This article incorporates text in the public domain from page 382 of the 20th edition of Gray's Anatomy (1918)