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IJAR.2020.153

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Type of Article:  Original Research

Volume 8; Issue 2.3 (June 2020)

Page No.: 7539-7542

DOI: https://dx.doi.org/10.16965/ijar.2020.153

POSTERIOR BELLY OF DIGASTRIC – A KEY MUSCLE TO LOCATE IMPORTANT NEUROVASCULAR STRUCTURES OF UPPER NECK REGION

Manjula Patil *1, Sangamesh Rakaraddi 2.

*1 Associate Professor, S. Nijalingappa Medical College, Bagalkot, Karnataka, India.

2 Assistant Professor, Department of Anatomy, S. Nijalingappa Medical College, Bagalkot, Karnataka, India.

Corresponding Author: Dr. Manjula Patil, Associate Professor, Department of Anatomy, S. Nijalingappa Medical College, Bagalkot, Karnataka, India. Ph. No: 9008616221 E-Mail: drmanjulapatil@gmail.com

ABSTRACT

Introduction: Posterior belly of digastric muscle (PBD) is located amidst of important neurovascular structures of head and neck region. Spinal accessory (SAN), Facial (FN) and Hypoglossal nerves (HGN), Common carotid artery (CCA) and internal jugular vein (IJV) are related deep to PBD. It is also easily identifiable landmark in this region. Establishing the accurate relationship between PBD and above mentioned structure would be of great help to head and neck surgeons to perform the surgeries with fewer complications.

Aims and objectives: To establish the near accurate relationship between PBD with HGN, FN, SAN, CCA and IJV.

Materials and methods: Fifty sagittal sections of head and neck region (25 right & 25 left sides) were studies for relation of PBD with various structures using Digital callipers: Length & extended length of PBD, distance between: tip of the mastoid process to HN loop, PBD to FN trunk, midpoint of PBD to midpoint of IJV & bifurcation of CCA, relationship between IJV and SAN above PBD.  Statistical analysis carried out using SPPS version 16.

Results: Distances measured were, Length of PBD was 3. 20± 0.08cm & 3.56 ±1.00cm on right & left side respectively indicating slightly longer length on left side. Extended length was 6.5±0.64cms & 6.8±1.12cms on right and left side respectively, TMP to HGN- where it crossed the PBD was 2.17±0.5 on right & 1.92±0.47cms on left, FN trunk and origin of PBD mean was 0.52cm (range 0.5 – 0.90cm), PBD to midpoint of IJV was 6.12± 0.88cm on right &6.44±1.02cm on left, midpoint of PBD to bifurcation of CCA2.56±0.74cm on right & 2.99±0.78cm on left. Relationship b/w SAN & IJV above PBD lateral to IJV in 95% on right 93% on left side.  There was no significant right & left difference between all the parameters..

Conclusions: PBD can be very good landmark to locate various neurovascular structures of head & neck region.

Key words: Posterior belly of digastric (PBD), Neurovascular bundle of head and neck, Facial never, Hypoglossal nerve, Spinal accessory nerve, Common carotid artery, Internal jugular vein.

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Cite this article: Manjula Patil, Sangamesh Rakaraddi. POSTERIOR BELLY OF DIGASTRIC – A KEY MUSCLE TO LOCATE IMPORTANT NEUROVASCULAR STRUCTURES OF UPPER NECK REGION. Int J Anat Res 2020;8(2.3):7539-7542. DOI: 10.16965/ijar.2020.153