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muscular branch to SCM hooks over hypoglossal nerve

o

superior thyroid a.

originates near tip of hyoid bone

descends to superior pole of thyroid gland

branch: superior laryngeal artery

pierces thyrohyoid membrane with internal laryngeal nerve

o

lingual a.

origin posterior to tip of greater horn of hyoid

o

facial a.

superior to lingual, may have common stem

o

ascending pharyngeal a.

first branch after bifurcation

o

carotid sheath

lateral: internal jugular vein

intermediate: vagus

medial: common carotid artery

o

vagus nerve

superior laryngeal nerve

internal laryngeal nerve: major branch of superior laryngeal nerve

o

pierces thyrohyoid membrane to supply superior portion of larynx with sensory fibers

external laryngeal nerve

o

supplies cricothyroid muscle and adjacent part of inferior constrictor

o

carotid sinus and body

carotid sinus: @ dilation of superior end of common carotid

pressoreceptors to respond to bp

carotid body

small mass of tissue at carotid bifurcation

responds to chemical changes in blood

o

veins

internal jugular vein

common facial vein

lingual vein

superior thyroid vein

submandibular triangle/digastric triangle

o

boundaries

inferior border of mandible

anterior and posterior belly of digastric

o

part of submandibular salivary gland and some lymph nodes fill space

o

submandibular gland wrapped around free posterior border of mylohyoid like letter U on its side

o

digastric bellies connected by intermediate tendon

tendon held to body and greater horn of hyoid by fibrous sling

tendon perforates slender, round, muscle: stylohyoid

posterior belly: from medial aspect of mastoid process

anterior belly: digastric fossa of mandible

o

hypoglossal nerve dives under mylohyoid muscle

submental triangle

o

boundaries:

inferior: body of hyoid bone

lateral: right and left anterior bellies of digastric muscles

o

floor: two mylohyoid muscles

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