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Case Reports 2018
Medical Case Reports
ISSN: 2471-8041
Page 49
May 28-29, 2018
London, UK
8
th
Edition of International Conference on
Clinical and Medical Case Reports
A
lthough infrahyoid muscles show considerable variations in
their development, existence of an anomalous digastricmuscle
in the neck was seldom reported. During dissection of triangles of
the neck for medical undergraduate students, we came across
an anomalous digastric muscle in the carotid sheath of left side
of neck. It was observed in a middle-aged cadaver at College of
Medicine and Health Sciences, Sultan Qaboos University, Muscat,
Oman. Digastric muscle was located within the carotid sheath
between the common and internal carotid arteries and internal
jugular vein. It had two bellies; cranial belly and caudal belly which
were connected by an intermediate tendon. The cranial belly of the
muscle was attached to the petrous part of the temporal bone. The
caudal belly extended into the superior mediastinum and merged
with the connective tissue around the left brachiocephalic vein.
In addition, the caudal belly of the muscle was connected to the
lateral margin of the sternothyroid by few muscle fasciculi. The
total length of muscle was 15.5 cm and the width of cranial belly,
intermediate tendon and caudal belly was found to be 5 mm, 2
mm and 4 mm, respectively. The anomalous muscle reported in
the present case might have formed by the abnormal splitting,
growth and/or differentiation of lingual-infrahyoid-diaphragmatic
band. Due to its close relation, the anomalous muscle may cause
compression of vascular structures in the carotid sheath and it may
cause confusion during diagnostic imaging of neck soft tissues.
The knowledge of reported variation is clinically important while
evaluating the compression of internal jugular vein in patients
with idiopathic intracranial hypertension and during the surgical
repair of carotid arteries.D. Retraint, Z. Quadir, W. Xu, L. Waltz, M. Ferry,
“Microstructural investigation of roll bonded nanocrystalline stainless
steel sheets”, The 16th International Conference on the Textures of
Materials (ICOTOM 16), Bombay (India), 12-17 December 2011.
Biography
Srinivasa Rao Sirasanagandla has completed his PhD from Manipal Universi-
ty, India. He is currently working as Assistant Professor in the Department of
Human & Clinical Anatomy, Sultan Qaboos University, Muscat, Oman. He has
publishedmore than 65 papers in reputed journals and has been serving as an
Editorial Board Member of repute journals.
srinivasa@squ.edu.omAn anomalous digastric muscle in the carotid sheath: a
case report with its embryological perspective and clinical
relevance
Srinivasa Rao Sirasanagandla, Omar Habbal
and
Mohamed Al Mushaiqri
Sultan Qaboos University, Oman
Srinivasa Rao Sirasanagandla et al., Med Case Rep. 2018, Volume 4
DOI:10.21767/2471-8041-C1-003
Figure1:
Note the cranial and caudal bellies of anomalous digastric
muscle connected by an intermediate tendon