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Supplies skin of anterior triangle of neck

o

Supraclavicular nerves (C3, C4)

Medial, intermediate, lateral branches

Blood vessels

o

External jugular vein

Superficial

From posterior to angle of mandible to 3 cm superior to clavicle

Vein pierces fascial roof of posterior triangle

Drains into subclavian vein

o

Thyrocervical trunk

Transverse cervical artery

Superior to clavicle, deep to omohyoid

Feeds levator scapulae and trapezius

Suprascapular artery

Goes posteriorly to suprascapular notch

Both arteries pass anterior to anterior scalene

Sometimes, one artery doesn’t arise from trunk

Subclavius muscle: inferior to clavicle

Omohyoid muscle

o

Inferior (posterior) and superior bellies separated by intertendon

o

Intertendon held to clavicle by fibrous expansion

Structures deep to floor of triangle

o

Splenius capitis, levator scapulae, three scalene muscles

o

Scalene anterior and medius

Inserted into first rib

Forms interscalene triangle

Subclavian artery and brachial plexus pass thru

Subclavian vein, transverse cervical a. and suprascapular a. passes anterior to scalene anterior

Phrenic nerve (C3-5) descends vertically across scalene anterior towards thorax

Scalene medius: pierced by motor nerves to rhomboids (C5) and serratus anterior (C5, 6)

Phrenic and supraclavicular nervesreferred pain

Anterior triangle of neck

Boundaries

o

Anterior: median line of neck

o

Posterior: anterior border of SC<

o

Superior: inferior border of mandible

Subdivided: muscular, carotid, submandibular and submental triangles

Cervical cavity

o

Boundaries:

Posterior: cervical vertebrae

Posterolaterally: scalenes

Laterally: SCM

Anterior: infrahyoid muscles

o

Cervical viscera

Superior part of digestive tract: pharynx and esophagus

Superior part of respiratory tract: larynx and trachea

Thyroid gland: anterior to digestive and respiratory tracts

Hyoid bone

o

b/w floor of mouth and superior end of neck

thyroid cartilage

o

large cartilage of larynx

o

laryngeal prominence

cricoid cartilage

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