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Bilateral Cleft Lip Surgery with Protruding Premaxilla
Bilateral Cleft Lip Surgery with Protruding Premaxilla
Published: 2015/02/15
Channel: BALAJI SM
VERTEBRATE SKULL: MAXILLARY & PREMAXILLARY BONES.avi
VERTEBRATE SKULL: MAXILLARY & PREMAXILLARY BONES.avi
Published: 2013/01/21
Channel: Walter Jahn
Early Premaxillary Setback with Alveolar Bone Grafting - Dr. S.M Balaji
Early Premaxillary Setback with Alveolar Bone Grafting - Dr. S.M Balaji
Published: 2015/02/17
Channel: BALAJI SM
Cyst Enucleation Premaxilla
Cyst Enucleation Premaxilla
Published: 2016/07/21
Channel: Ninan Thomas
Bilateral Cleft lip Surgery (Very tinny prolabium, mobile premaxilla) - Dr. SM Balaji
Bilateral Cleft lip Surgery (Very tinny prolabium, mobile premaxilla) - Dr. SM Balaji
Published: 2015/02/12
Channel: BALAJI SM
Lucky - Premaxilla
Lucky - Premaxilla
Published: 2015/03/30
Channel: SOTA House
Glasseye premaxilla protrusion
Glasseye premaxilla protrusion
Published: 2014/04/07
Channel: Nina Finley
How to say "premaxilla"! (High Quality Voices)
How to say "premaxilla"! (High Quality Voices)
Published: 2017/02/09
Channel: WordBox
WitmerLab: Nigersaurus - Premaxilla Dental Battery
WitmerLab: Nigersaurus - Premaxilla Dental Battery
Published: 2008/07/12
Channel: WitmerLab
Corrective Jaw (Orthognathic) Surgery, Animation.
Corrective Jaw (Orthognathic) Surgery, Animation.
Published: 2016/04/14
Channel: Alila Medical Media
Embryology of the Head and Neck - Chapter 2: Embryology of the Head, Face and Oral Cavity
Embryology of the Head and Neck - Chapter 2: Embryology of the Head, Face and Oral Cavity
Published: 2013/01/23
Channel: OER Africa
Having orthognathic surgery
Having orthognathic surgery
Published: 2013/10/15
Channel: Plattsburgh Oral Surgery, PC
To Alveoplasty or Not - Immediate Denture
To Alveoplasty or Not - Immediate Denture
Published: 2012/06/20
Channel: All Things Dentistry
Megapiranha Bite Simulations at WKU
Megapiranha Bite Simulations at WKU
Published: 2012/12/18
Channel: Justin Grubich
How to Pronounce Premaxilla
How to Pronounce Premaxilla
Published: 2013/08/09
Channel: Emma Saying
Thescelosaurus - Video Learning - WizScience.com
Thescelosaurus - Video Learning - WizScience.com
Published: 2015/08/05
Channel: Wiz Science™
Nose Job And Nose Anatomy (Rhinoplasty) - Sense Of Smell Physiology
Nose Job And Nose Anatomy (Rhinoplasty) - Sense Of Smell Physiology
Published: 2016/04/10
Channel: Animated Anatomy
Stratiotosuchus - Video Learning - WizScience.com
Stratiotosuchus - Video Learning - WizScience.com
Published: 2015/09/29
Channel: Wiz Science™
Genyodectes - Video Learning - WizScience.com
Genyodectes - Video Learning - WizScience.com
Published: 2015/09/17
Channel: Wiz Science™
How to Pronounce Premaxilla
How to Pronounce Premaxilla
Published: 2015/06/01
Channel: Pronunciation Guide
Caso Clinico - Dott. Tiberio Ciarrocca
Caso Clinico - Dott. Tiberio Ciarrocca
Published: 2014/07/21
Channel: ETK La relation implantoactive
How to Pronounce Premaxilla
How to Pronounce Premaxilla
Published: 2016/11/20
Channel: Dictionary Voice
Ricostruzione premaxilla con prelievo dalla branca montante della mandibola
Ricostruzione premaxilla con prelievo dalla branca montante della mandibola
Published: 2013/04/17
Channel: Odontosalus - Studio Dentistico Bari
Diandongosuchus - Video Learning - WizScience.com
Diandongosuchus - Video Learning - WizScience.com
Published: 2015/09/11
Channel: Wiz Science™
Labio Paladar Hendido Bilateral /Cleft lip and palate
Labio Paladar Hendido Bilateral /Cleft lip and palate
Published: 2016/01/15
Channel: Tania Herrera
Simultaneous Palatoplasty and Premaxillary Setback in Children with Bilateral Complete Cleft Lip and
Simultaneous Palatoplasty and Premaxillary Setback in Children with Bilateral Complete Cleft Lip and
Published: 2017/06/11
Channel: সংযোগ .কম
How to pronounce Premaxilla
How to pronounce Premaxilla
Published: 2017/01/26
Channel: How to pronounce
What does premaxillary mean?
What does premaxillary mean?
Published: 2015/07/18
Channel: What Does That Mean?
Erythrosuchidae - Video Learning - WizScience.com
Erythrosuchidae - Video Learning - WizScience.com
Published: 2015/09/29
Channel: Wiz Science™
Bilateral Cleft Lip and Palate - Palatal Repair with Vomerine flap
Bilateral Cleft Lip and Palate - Palatal Repair with Vomerine flap
Published: 2015/01/28
Channel: BALAJI SM
Anatomy of the human nose - Video Learning - WizScience.com
Anatomy of the human nose - Video Learning - WizScience.com
Published: 2015/08/11
Channel: Wiz Science™
Saurolophus - Video Learning - WizScience.com
Saurolophus - Video Learning - WizScience.com
Published: 2015/08/02
Channel: Wiz Science™
Hypro-Sorb M - 0.3 mm Membrane & Hypro-Oss
Hypro-Sorb M - 0.3 mm Membrane & Hypro-Oss
Published: 2016/03/07
Channel: Bioimplon GmbH
Bilateral cleft lip surgery - Dr SM Balaji
Bilateral cleft lip surgery - Dr SM Balaji
Published: 2015/11/12
Channel: BALAJI SM
Slide 15: Development and growth of maxilla
Slide 15: Development and growth of maxilla
Published: 2012/01/02
Channel: knust oer
Prof. Adi Lorean- Nasal Floor Elevation
Prof. Adi Lorean- Nasal Floor Elevation
Published: 2016/03/28
Channel: Dental Pro Video
Heterodontosauridae - Video Learning - WizScience.com
Heterodontosauridae - Video Learning - WizScience.com
Published: 2015/08/06
Channel: Wiz Science™
Dr. Eber Stevao - MAXILLARY INTERDENTAL OSTEOTOMY GUIDED BY SCREWS-RETAINED SURGICAL SPLINT
Dr. Eber Stevao - MAXILLARY INTERDENTAL OSTEOTOMY GUIDED BY SCREWS-RETAINED SURGICAL SPLINT
Published: 2017/06/03
Channel: Dr. Éber Stevão
Bilateral lip repair - child with large pre-maxilla and Hypertelorism
Bilateral lip repair - child with large pre-maxilla and Hypertelorism
Published: 2015/11/01
Channel: BALAJI SM
How to Pronounce Premaxillary Bone
How to Pronounce Premaxillary Bone
Published: 2016/12/12
Channel: Dictionary Voice
What does premaxillary mean
What does premaxillary mean
Published: 2016/01/16
Channel: botcaster inc. bot
Incisor
Incisor
Published: 2014/11/08
Channel: Audiopedia
نسج متحركة في مقدمة الفك العلوي
نسج متحركة في مقدمة الفك العلوي
Published: 2013/12/07
Channel: Hamzah Abbas
implantremoval.mpg
implantremoval.mpg
Published: 2009/12/07
Channel: SanitasVeritas
T. rex fossil CAT Scan
T. rex fossil CAT Scan
Published: 2008/02/27
Channel: Burke Museum
Bilateral Cleft Lip Pushback technique. by Prof Rida Franka.
Bilateral Cleft Lip Pushback technique. by Prof Rida Franka.
Published: 2011/12/12
Channel: Rida Franka
Dinosaur Fossil Prospecting 2/20/12  Katie finds a T-rex Tooth
Dinosaur Fossil Prospecting 2/20/12 Katie finds a T-rex Tooth
Published: 2012/02/21
Channel: CKPreparations
Elasmosaurus - Video Learning - WizScience.com
Elasmosaurus - Video Learning - WizScience.com
Published: 2015/08/07
Channel: Wiz Science™
Tanycolagreus - Video Learning - WizScience.com
Tanycolagreus - Video Learning - WizScience.com
Published: 2015/08/05
Channel: Wiz Science™
An Overview: Nature of the Velopharyngeal (VP) Mechanism Delivery of Service
An Overview: Nature of the Velopharyngeal (VP) Mechanism Delivery of Service
Published: 2016/05/19
Channel: castors2007
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WIKIPEDIA ARTICLE

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Premaxilla
Spinosaurus skull en.svg
Skull of Spinosaurus aegyptiacus, premaxilla in orange
Gray199.png
Human premaxilla and its sutures
Details
Precursor median nasal prominence
Dorlands
/Elsevier
p_32/12664417
Anatomical terminology

The premaxilla (or praemaxilla) is one of a pair of small cranial bones at the very tip of the upper jaw of many animals, usually, but not always, bearing teeth. In humans, they are fused with the maxilla and usually termed as the incisive bone. Other terms used for this structure include premaxillary bone or os premaxillare, and intermaxillary bone or os intermaxillare.

Human anatomy[edit]

In humans, the premaxilla is referred to as the incisive bone and is the part of the maxilla which bears the incisor teeth, and encompasses the anterior nasal spine and alar region. In the nasal cavity, the premaxillary element projects higher than the maxillary element behind. The palatal portion of the premaxilla is a bony plate with a generally transverse orientation. The incisive foramen is bound anteriorly and laterally by the premaxilla and posteriorly by the palatine process of the maxilla. [1]

Embryology[edit]

In the embryo, the nasal region develops from neural crest cells which start their migration down to the face during the fourth week of gestation. A pair of symmetrical nasal placodes (thickenings in the epithelium) are each divided into medial and lateral processes by the nasal pits. The medial processes become the septum, philtrum, and premaxilla.[2]

The first ossification centers in the area of the future premaxilla appear during the seventh week above the germ of the second incisor on the outer surface of the nasal capsule. After eleven weeks an accessory ossification center develops into the alar region of the premaxilla. Then a premaxillary process grow upwards to fuse with the frontal process of the maxilla; and later expands posteriorly to fuse with the alveolar process of the maxilla. The boundary between the premaxilla and the maxilla remains discernible after birth and a suture is often observable up to five years of age. [1]

In bilateral cleft lip and palate, the growth pattern of the premaxilla differs significantly from the normal case; in utero growth is excessive and directed more horizontally, resulting in a protrusive premaxilla at birth.[3]

Evolutionary variation[edit]

Forming the oral edge of the upper jaw in most jawed vertebrates, the premaxillary bones comprise only the central part in more primitive forms. They are fused in blowfishes and absent in cartilaginous fishes such as sturgeons.[4]

Reptiles and most non-mammalian therapsids have a large, paired, intramembranous bone behind the premaxilla called the septomaxilla. Because this bone is vestigial in Acristatherium (a Cretaceous eutherian) this species is believed to be the oldest known therian mammal. Intriguingly the septomaxilla is still present in monotremes.[5][6]

The differences in the size and composition in the premaxilla of various families of bats is used for classification.[7]

References[edit]

  1. ^ a b Lang, Johannes (1995). Clinical anatomy of the masticatory apparatus peripharyngeal spaces. Thieme. ISBN 978-3-13-799101-4. 
  2. ^ "Nasal Anatomy". Medscape. June 2011. Retrieved December 2011.  Check date values in: |access-date= (help)
  3. ^ Vergervik, Karin (1983). "Growth Characteristics of the Premaxilla and Orthodontic Treatment Principles in Bilateral Cleft Lip and Palate" (PDF). Cleft Palate Journal. 20 (4). Retrieved December 2011.  Check date values in: |access-date= (help)
  4. ^ "Premaxilla". ZipCodeZoo. Retrieved December 2011.  Check date values in: |access-date= (help)
  5. ^ Hu, Yaoming; Meng, Jin; Li, Chuankui; Wang, Yuanqing (January 22, 2010). "New basal eutherian mammal from the Early Cretaceous Jehol biota, Liaoning, China". Proc Biol Sci. 277 (1679): 229–236. PMC 2842663Freely accessible. PMID 19419990. doi:10.1098/rspb.2009.0203. 
  6. ^ Wible, John R.; Miao, Desui; Hopson, James A. (March 1990). "The septomaxilla of fossil and recent synapsids and the problem of the septomaxilla of monotremes and armadillos". Zoological Journal of the Linnean Society. 98 (3): 203–228. doi:10.1111/j.1096-3642.1990.tb01207.x. 
  7. ^ Myers, P.; Espinosa, R.; Parr, C. S.; Jones, T.; Hammond, G. S.; Dewey, T. A. (2006). "Premaxillae of bats". Animal Diversity Web. Retrieved December 2011.  Check date values in: |access-date= (help)

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