Anatomical study of the human omohyoid
muscle: Regarding intermediate morphologies between normal and anomalous morphologies of the superior belly.
Further detail is provided in Gray's Anatomy (Standring 2005), which states that the clavicle, subclavius, SCM and omohyoid
, lateral part of the carotid sheath, phrenic nerve, transverse cervical, suprascapular and ascending cervical arteries, subclavian vein, prevertebral fascia, and phrenic nerve are all anterior to scalenus anterior.
Its posterior insertion arose underneath the omohyoid
muscle, separated by the cervical fascia that encloses this muscle.
There were two soft swelling in right side of neck one in jugulodiagastric area which was 3x2 cm in size another in omohyoid
area of 4x2 cm in size.
One possible reason for this anomaly is the action of the omohyoid
muscle, which is a laryngeal depressor muscle that originates at the scapula and inserts at the hyoid bone.
Upon exploration, it was noted that the mass was deep to the sternocleidomastoid and omohyoid
CCA Common Carotid Artery ECA External Carotid Artery ICA Internal Carotid Artery STA Superior Thyroid Artery SCM Sternocleidomastoid Muscle SH Sternohyoid OH Omohyoid
SMG Submandibular Gland CCA Common Carotid Artery ECA External Carotid Artery ICA Internal Carotid Artery STA Superior Thyroid Artery SLA Superior Laryngeal Artery SCM Sternocleidomastoid Muscle TG Thyroid Gland SMG Submandibular Gland DOI: 10.14260/jemds/2014/2691
The latter is followed to its extremity in the anterior belly of the omohyoid
or other strap muscle.
This venous channel arises from the external jugular vein, traverses parallel to the inferior belly of omohyoid
and emptied into the internal jugular vein at the level of the middle of the sternocleidomastoid.
Yadav et al., (2000) describe a case where the EJV crossed sternocleidomastoid muscle superficially and ended in IJV above the level of superior belly of omohyoid
. In contrast to the above mentioned literature, in the present report, EJV on left side is the continuation of the anterior division of CFV, which coursed obliquely downwards to cross the midline and drain into the opposite subclavian vein (right).
unusual insertion of the stylohyoid & digastric muscles, an unusual occurrence of levator submandibuli muscle (Banjo muscle), duplicated or other anomalies of omohyoid
, anomalous belly of sternothyroid muscle or appearance of levator claviculae muscle (1-6).
The muscle belly was found to be attached to the upper border of the scapula lateral to the attachment of inferior belly of the omohyoid
. The proximal end of the tendon was found attached to the costal cartilage of the first rib, deep to the subclavius.