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o

inferior to thyroid cartilage, superior to 1st tracheal ring

o

level of C6

carotid sheath: side of cervical visceral

o

common carotid artery, internal jugular vein, vagus nerve

arterial supply

o

common carotid = external + internal carotid

external carotid

all structures of head and neck outside of cranial cavity

internal carotid

structures within cranial and orbital cavities

forehead

o

vertebral arteries

thru transverse foramen and foramen magnum

contribute to cerebral arterial circle

o

thyrocervical trunk

lower part of neck

superficial veins

o

facial vein travels along lower border of mandible, joined by anterior division of retromandibular vein

drains into internal jugular vein deep to SCM

o

anterior jugular vein

may be connected to facial vein by communicating branch

muscular triangle

o

separated from carotid triangle by superior belly of omohyoid

o

contains four infrahyoid muscles

superficial

superior belly of omohyoid

sternohyoid

deep

sternothyroid

thyroid

innervation: ansa cervicalis (ventral roots of C1-C3)

carotid triangle

o

boundaries

superior belly of omohyoid

posterior belly of digastric

anterior border of SCM

o

common carotid artery ascends thru triangle

o

nerves

accessory

hypoglossal (CN XII)

motor nerve to muscles of tongue

courses anteriorly

posterior belly of digastric lies lateral to nerve

ansa cervicalis

superior root (mostly C1) adheres and runs with hypoglossal nerve

inferior root (C2, C3) descends from superior neck region to join superior root

two roots form loop

o

arteries

common carotid artery and internal carotid artery

no branches in neck

external carotid artery: lies anteromedial to internal carotid artery

several branches given off before reaching posterior belly of digastric

o

occipital artery

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