Limits...
A rare variation of the digastric muscle.

Kalniev M, Krastev D, Krastev N, Vidinov K, Veltchev L, Apostolov A, Mileva M - Clujul Med (2013)

Bottom Line: We found out bilateral variation of the digastric muscle in one cadaver.The anatomical variations observed of our study related only to the anterior belly, as previously described by other authors.It is very important to consider the occurrence of the above mentioned variations in the digastric muscle when surgical procedures are performed on the anterior region of the neck.

View Article: PubMed Central - PubMed

Affiliation: Department of Anatomy and Histology, Medical University of Sofia, Bulgaria.

ABSTRACT
The digastric muscle is composed by two muscle bellies: an anterior and a posterior, joined by an intermediate tendon. This muscle is situated in the anterior region of the neck. The region between the hyoid bone and the mandible is divided by an anterior belly into two triangles: the submandibular situated laterally and the submental triangle which is located medially. We found that the anatomical variations described in the literature relate mainly to the anterior belly and consist of differences in shape and attachment of the muscle. During routine dissection in February 2013 in the section hall of the Department of Anatomy and Histology in Medical University - Sofia we came across a very interesting variation of the digastric muscle. The digastric muscles that presented anatomical variations were photographed using a Sony Cyber-shot DSC-T1 camera, with a Carl Zeiss Vario-Tessar lens. We found out bilateral variation of the digastric muscle in one cadaver. The anterior bellies were very thin and insert to the hyoid bone. Two anterior bellies connect each other and thus they formed a loop. The anatomical variations observed of our study related only to the anterior belly, as previously described by other authors. It is very important to consider the occurrence of the above mentioned variations in the digastric muscle when surgical procedures are performed on the anterior region of the neck.

No MeSH data available.


Related in: MedlinePlus

Mylohyoid muscle is prepared bilateral. It is obviously the absence of the anterior belly of digastric muscle under the mylohyoid. Instead two anterior bellies of digastric are caught to
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4462457&req=5

f3-cm-86-327: Mylohyoid muscle is prepared bilateral. It is obviously the absence of the anterior belly of digastric muscle under the mylohyoid. Instead two anterior bellies of digastric are caught to

Mentions: As seen on the Figures 1, 2, 3, and 4, the anterior belly of the digastric muscle originates from the original mesoderm of the first pharyngeal arch. The deficiency in the differentiation of this layer on one side may be responsible for unilateral variations, whereas deficiencies on both sides may be responsible for bilateral variations [7]. In our case the variation of the digastric muscle was bilateral. Thus we came to the conclusion that the deficiency in the differentiation of the first pharyngeal arch was bilateral. This does not correspond to the literature data according to which the unilateral variations are more frequent [9,8]. In some cases unilateral anatomical variations may be responsible for the asymmetry in the anterior region of the neck or even in the movement of the floor of the mouth [8] or the temporomandibular joint [1]. Thus they may present greater clinical importance because this may lead to an imbalance in the movement of the larynx. However, more recentl investigations [5] showed a balance between unilateral and bilateral variations. According to this study the percentage of unilateral and bilateral variations of the digastric muscle is equalized. It is important to note that the unilateral type of asymmetry may be able to be considered in clinical examinations and in imaging examinations like ultrasound, tomography and magnetic resonance, with lymph nodes, benign cervical masses like thyroglossal cysts, or neoplasia [13].


A rare variation of the digastric muscle.

Kalniev M, Krastev D, Krastev N, Vidinov K, Veltchev L, Apostolov A, Mileva M - Clujul Med (2013)

Mylohyoid muscle is prepared bilateral. It is obviously the absence of the anterior belly of digastric muscle under the mylohyoid. Instead two anterior bellies of digastric are caught to
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4462457&req=5

f3-cm-86-327: Mylohyoid muscle is prepared bilateral. It is obviously the absence of the anterior belly of digastric muscle under the mylohyoid. Instead two anterior bellies of digastric are caught to
Mentions: As seen on the Figures 1, 2, 3, and 4, the anterior belly of the digastric muscle originates from the original mesoderm of the first pharyngeal arch. The deficiency in the differentiation of this layer on one side may be responsible for unilateral variations, whereas deficiencies on both sides may be responsible for bilateral variations [7]. In our case the variation of the digastric muscle was bilateral. Thus we came to the conclusion that the deficiency in the differentiation of the first pharyngeal arch was bilateral. This does not correspond to the literature data according to which the unilateral variations are more frequent [9,8]. In some cases unilateral anatomical variations may be responsible for the asymmetry in the anterior region of the neck or even in the movement of the floor of the mouth [8] or the temporomandibular joint [1]. Thus they may present greater clinical importance because this may lead to an imbalance in the movement of the larynx. However, more recentl investigations [5] showed a balance between unilateral and bilateral variations. According to this study the percentage of unilateral and bilateral variations of the digastric muscle is equalized. It is important to note that the unilateral type of asymmetry may be able to be considered in clinical examinations and in imaging examinations like ultrasound, tomography and magnetic resonance, with lymph nodes, benign cervical masses like thyroglossal cysts, or neoplasia [13].

Bottom Line: We found out bilateral variation of the digastric muscle in one cadaver.The anatomical variations observed of our study related only to the anterior belly, as previously described by other authors.It is very important to consider the occurrence of the above mentioned variations in the digastric muscle when surgical procedures are performed on the anterior region of the neck.

View Article: PubMed Central - PubMed

Affiliation: Department of Anatomy and Histology, Medical University of Sofia, Bulgaria.

ABSTRACT
The digastric muscle is composed by two muscle bellies: an anterior and a posterior, joined by an intermediate tendon. This muscle is situated in the anterior region of the neck. The region between the hyoid bone and the mandible is divided by an anterior belly into two triangles: the submandibular situated laterally and the submental triangle which is located medially. We found that the anatomical variations described in the literature relate mainly to the anterior belly and consist of differences in shape and attachment of the muscle. During routine dissection in February 2013 in the section hall of the Department of Anatomy and Histology in Medical University - Sofia we came across a very interesting variation of the digastric muscle. The digastric muscles that presented anatomical variations were photographed using a Sony Cyber-shot DSC-T1 camera, with a Carl Zeiss Vario-Tessar lens. We found out bilateral variation of the digastric muscle in one cadaver. The anterior bellies were very thin and insert to the hyoid bone. Two anterior bellies connect each other and thus they formed a loop. The anatomical variations observed of our study related only to the anterior belly, as previously described by other authors. It is very important to consider the occurrence of the above mentioned variations in the digastric muscle when surgical procedures are performed on the anterior region of the neck.

No MeSH data available.


Related in: MedlinePlus