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arise from mandible

insert into hyoid bone

fibers of right and left muscles meet in median fibrous raphe

innervated by mylohyoid nerve (V3)

sheltered by lower  border of mandible

most distal portion closely applied to mylohyoid muscle

one branch reaches anterior belly of digastric

cervical viscera

o

superior parts of digestive tract: pharynx and esophagus

o

superior parts of respiratory tract: larynx and trachea

o

thyroid gland

b/w carotid sheaths of both sides

right and left lobes connected by isthmus (above 2nd-4th tracheal rings)

may have pyramidal lobe above isthmus towards hyoid

endocrine organ-->rich blood supply and drainage

fed by superior thyroid artery and inferior thyroid artery (from thyrocervical trunk)

drained by superior, middle, inferior thyroid veins

fascial band attaches capsule of gland to 1st tracheal ring

recurrent laryngeal nerve ascends posterior to gland

characteristic colloid structure

o

parathyroid glands

small glands on posterior border of thyroid gland b/w capsule and sheath

regulate calcium and phosphorus metabolism

root of neck

o

aka thoracocervical region: jxn b/w thorax and neck

o

boundaries

anterior: manubrium of sternum

lateral: first ribs

posterior: body of first thoracic vertebra

o

includes superior thoracic aperture

all structures from head to thorax pass thru

o

thoracic duct

opens at angle b/w left subclavian vein and left internal jugular vein

arches from side of esophagus laterally to angle b/w IJA and subclavian

anterior to vertebral vein: dumps into brachiocephalic vein

o

right side lymphatic drainage

lymphatic trunks empty into right subclavian and jugular veins

o

phrenic nerve

applied to ventral surface of anterior scalene

o

transverse cervical and suprascapular arteries pass directly anterior to phrenic nerve and scalene anterior

o

thyrocervical trunk: near medial border of scalene anterior

o

inferior thyroid artery

third branch of thyrocervical trunk

passes posterior to carotid sheath

supplies inferior pole of thyroid gland

o

internal thoracic artery: inferior to origin of thyrocervical trunk

o

vertebral art: large branch of subclavian

scalene anterior and longus colli: form two sides of triangle of vertebral artery

apex of triangle: C6 triangle

o

common carotid artery: anterior to tubercle of C6 vertebrae

Parotid Region

occupied by parotid gland

boundaries

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