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\title{Developmental Anomalies of Temporal Muscle Superficial Temporal Muscle}
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             \author[1]{Cotroneo  Gustavo}

             \affil[1]{  Hospital Argerich}

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\date{\small \em Received: 14 December 2013 Accepted: 2 January 2014 Published: 15 January 2014}

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\begin{abstract}
        


The anatomy of the temporal region is complex. Also there is controversy over the structures that make up the region.Thus than classically described anatomical structures as fascias, temporal muscle, frontal nerve, arteries, the superficial temporal muscle is present in a variable number of cases. This muscle represents fibrous regression of named superficial temporal muscle very developed in animals with a specific masticatory action. In human has no physiological importance but its knowledge is important for plastic and maxillofacial surgeons to undertake surgeries in the region since it can generate confusion over anatomical planes and their relationship to vessels and nerves.

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\let\tabcellsep& 	 	 		 
\section[{Introduction}]{Introduction}\par
he temporal region has anatomical structure of subcutaneous fascias that confuses not only the constitution of the region but also during plastic and reconstructive surgical maneuvers. Identify di fferent fascias and its connections with numerous nerve and artery branches that cross the region is especially important for plastic surgeons.\par
The first fascial layer of the region is called temporoparietal fascia and it is located below the hair follicles and subcutaneous tissue of the temporoparietal region. It is c onsidered a cephalic extensi on of the superfical muscul oaponeurotic system described by  {\ref Mitz V and Peyronie M (1974)} and continues in all directions with other structures of this system \hyperref[b0]{(1)}.\par
Anteriorly, it is continuous with the frontalis and orbicularis oculi muscle, whereas posteriorly, it blends with the occipitalis and posterior auricular muscles. Superiorly, the fascia merges with the galea aponeurotica and inferiorly it is continuous with the superficial musculoap oneurotic system. (2) \hyperref[b2]{(3)} Traditionally, it has been described as a single sheet, although other authors such as Knize DM (4) and Tellio?lu AT (5) mention that this would comprise two sheets. Histological studies showed the presence of a thin muscular sheet in the outer sheet of the temporoparietal fascia below the temporal line. This muscle correspond s to the superficial temporal muscle present in some animals but that it has been transform rudimentary in humans and only remains superficially covering the temporal region.\par
Author ? ?: Hospital Argerich, Argentina. e-mail: cotro\textunderscore @hotmail.com These muscle fibers lack functionality and constitute only anatomical finding.\par
A loose areolar tissue plane lies deep to the temporoparietal fascia and extends beneath the entire superficial fascia system of the scalp, including the galea aponeurotica and the frontalis and occipitalis muscle.\par
Deeper is the temporal fascia, which surrounds the temporal muscle. Underneath the muscle, this fascia merges with the periosteum of the temporal , frontal and parietal bone. Superiorly, the temporal fascia inserts in the superior temporal line and inferiorly it inserts in the zigmatic arch. (6). FIGURE  {\ref 1}.\par
There is no doubt that the most important anatomic element in the region is the frontal branch of the facial nerve.\par
The facial nerve runs almost horizontally to the parotid 2cm below the zygomatic arch, heading obliquely from bac k to front , from inside to outside and from top to bottom. As it leads to the periphery of the parotid gland, it becomes more superficial. Inside of the parotid gland, the division of the primary branches occurs: an upper, the temporo-facial and lower the cervical facial. \hyperref[b6]{(7)} When the temporo-facial branch reaches the level of the mandibular condyle, it is divided into several secondary trunks, which usually anastomose forming true plexuses. The branches that arise from the temporo-facial trunk are: 1. Frontal; 2. Temporal; 3. Eyelid branches; 4. Zigomatics and 5. Upper mouth.\par
Regarding the temporal region above the zygomatic arch, the frontal branch is located in the existing plane between the temporoparietal fascia and the superficial layer of the temporal fascia. This paper has following objective to clarify anatomical knowledge of the temporoparietal region, principally when fibers of temporal superficial muscle are presents avoiding erroneous surgical maneuvers and potentially dangerous for both regional nerves and vessel s.  
\section[{Material and Method}]{Material and Method}\par
It is difficult to establish the true incidence rate of this muscle abnormality, but In 58 surgeries performed in the temporal region in the Plastic and Reconstructive Department of Cosme Argerich Hospital in Buenos Aires was evident the presence of superficial muscle fibers confirmed by direct visualization and histologic studies in 29 patients. The histological study confirmed striated skeletal muscle with hematoxilin and eosin staining. FIGURE  {\ref 2 AND 3}.\par
Twenty patients (69\%) were operated of aging face by mean of superficial and submuscular lifting and other 9 (31\%) underwent maxillofacial surgeries in TM J, superior maxilla and zigomatic arch.\par
During undermining of temporal area, atrophic muscular fibers were found immediately below subcutaneous fat layer into temporoparietal fascia. all cases (29 patients) muscle fibers were very thin, forming isolated groups extended on temporal area. 
\section[{III.}]{III.} 
\section[{Superficial Temporal Muscle and}]{Superficial Temporal Muscle and}\par
Comparative Anatomy  {\ref Oxnard CE al. (2008)} in their research note 400 human corpses, 35 of which possessed the superficial temporal muscle. These bodies possessing the superficial temporal muscle were dissected. Furthermore dissected 4 chimpanzes, 4 rhesus monkeys, col obus monkeys and other species. \hyperref[b7]{(8)} In monkeys and apes, the arrangement of the dissected temporal muscles at work is consistent with primate anatomy texts. A superficial fleshy head of the temporalis muscle takes origin from the skull area between the superior and inferior temporal ridges, from the ridges themselves and t o a slight degree from the outer surface of the underlying deep head. Further a few aditional fibres taking origin from the internal surface of the zygomatic arch. This superficial muscle is covered by deep fascia which arises from the superior temporal ridge of the skull and passes downwards on the surface of the superficial fibres of the muscle to the coronoid process of the mandible.\par
The main (deep) part of the temporal muscle is below the superficial temporal muscle and ari ses from the periosteum covering a large part of the lateral surface of the skull below the inferior temporal ridge. This muscle gives way to a glistening silver tendon which al so inserts on the coronoid process of the mandible. This muscle is covered by deep fascia which arises, as does the deep fascia lining the undersurface of the superficial head, from the inferi or temporal ridge. The fact , however, that these two layers are separate implies that, at least on occasion, these two muscles are capable of contracting independently, even thought they might often act together.\par
In humans, the temporalis muscle is different. It arises from the cranium at and below the inferior temporal line (a thin line in humans, rather a strong ridge as in apes and most large monkeys). It is characterised by a glistening silver tendon just like that of the deep head in apes and monkeys. Underlying the human temporalis muscle is a deeper layer of deep fascia entirely similar t o the deepest layer under the deep head in apes and monkeys.\par
Oxnard CE in his research dissected 35 cadavers in each of which a complete or partial superficial head of the temporalis muscle was present. These anomalous muscular heads extends from situations just like in apes and monkeys where the entire muscle was present , though very much thinner, to situations in which lesser portions of the muscle were found .\par
There were 4 cases (1\%) with a superficial head entirely similar, though very much thinner, to that in apes and monkeys. There were 31 cases (8\%) in which a partial superficial head was present . This muscle arises from the area c omprised between the temporal lines. It has a cranial part thay may have muscle fibers or have mostly aponeurotic comp onent. As in apes and monkeys, this muscle receives muscular fibers from the surface of the deep temporal muscle and the internal face of the zygomatic arch and directed to the coronoid process of mandible. (8) FIGURE  {\ref 4}.\par
Why the loss of this temporal muscle has occurred in humans? An obvious possibility is that changed masticatory habits and mechanics did not render such reduction or loss deleteious, whereas such changes would be inmediately eliminated in creatures with the diets of most apes and monkeys.\par
Furthermore, Testut, in his description of the epicranial fascia or aponeurotic galea expressed that morphologically the galea should be considered, as the muscles that attaches, as a portion of the panniculus carnosus, which originally muscular, has experienced during its development a fibrous regression. (9) \hyperref[b9]{(10)} IV. 
\section[{Discussion}]{Discussion}\par
The temporal region is a c omplex anatomical area due to its comp osition of multiple layers and there is a strong semantic and practical controversy over its component structures and the relationships they have with each other.\par
Understanding the anatomy of the area is important for the plastic and head and neck surgeons, to accurately identify different fascias that span the region and its c onnections with numerous nerve and artery branches that cross the region. It is essential to know the frontal branch of the temporo-facial branch of the facial nerve that extends obliquely from the zygomatic arch t o reach the deepest part of the frontal muscle.\par
dissection of the temporal region for aesthetic or reconstructive surgeries.\par
The presence of muscle fibers in superficial planes may confuse the surgeon who can work in a wrong plane and al so, he can make future surgical maneuvers that may endanger any of the neural structures mentioned.\par
There is sufficient evidence to show the presence of a thin muscular layer or even isolated muscle fibers in the temporoparietal fascia, below the hair follicles. This muscle correspond s to the superficial temporal muscle present in animal s that has been devolving in humans, but there may be remains superficially covering the temporal region; these muscle fibers lack functionality and are only anatomical finding. FIGURE  {\ref 5}.\par
Of the different explanatory theories about the persistence of this muscle, have value two: 1) remnant of the superficial temporal muscle and 2) remaining panniculus carnosus Animals including lower mammals, have muscles that are attached to the skin, these are skin muscles or panniculus carnosus \hyperref[b10]{(11)}. These muscles allow the animal to mobilize certain areas of the skin, apparently as a protective measure to ward located noxas agents, such as insects. In human limbs have evolved so much that can reach any part of the body. For this reason, the panniculus carnosus became obsolete and has devolved. But remnants of the it can be found in some individuals. Some muscles may contain remnants of the panniculus carnosus as the pectoralis major, trapezius, serratus, pyramidalis, palmaris longus and some craniofacial muscles.\par
V. 
\section[{Conclusion}]{Conclusion}\par
It is essential the knowledge of the complex anatomy of the temporal region for the surgeon that undertake any surgery in the region. Fibers of the superficial temporal muscle can be usually finding; though they have no functional or physiological significance but surgical importance.\par
From another point of view, the presence of this muscle must be known by maxillofacial surgeons when they perform surgeries on the region in case of both superior mandible or TMJ approaches.\par
For the plastic surgeon also it is important to know the existence of the superficial temporal muscle and that may become apparent during the regional dissection in the treatment of periorbital aging or any other variety of rhytidectomies c onfusing the surgeon about the exact location of the anat omical planes and their relation to nerve and vascular structures.\begin{figure}[htbp]
\noindent\textbf{}\includegraphics[]{image-2.png}
\caption{\label{fig_0}TI}\end{figure}
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