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Front 1

HYOID BONE
-vs. muscles
-describe the bone.

Back 1

1. Hyoid bone

a. The infrahyoid and suprahyoid muscles suspend the U-shaped
hyoid bone at the angle between the chin and neck; it has no bony
articulation

b. The hyoid has a wide, anterior body from which greater cornua extend posteriorly on each side; lesser cornua project superiorly at the
junctions ofthe body and greater cornua

Front 2

INFRAHYOID MUSCLES

STERNOHYOID

OI

Back 2

B. Infrahyoid muscles
2. Sternohyoid

a. Origin: manubrium
b. Insertion: body ofthe hyoid

Front 3

INFRAHYOID MUSCLES

OMOHYOID

OI
-intermediate tendon

Back 3

3. Omohyoid

a. Origin (superior belly): body ofthe hyoid, lateral to the Sternohyoid

b. An intermediate tendon is located posterior to the sternocleidomastoid and is bound to the clavicle by a fascial sling:

c. Insertion (inferior belly): superior border of the scapula, medial to the scapular notch

Front 4

INFRAHYOID MUSCLES

STERNOHYOID

OI

Back 4

B. Infrahyoid muscles
4. Sternothyroid

a. Origin: manubrium
b. Insertion: oblique line ofthe thyroid cartilage ofthe larynx

Front 5

INFRAHYOID MUSCLES

THYROHYOID

OIAI

Back 5

5. Thyrohyoid
a. Origin: oblique line ofthe thyroid cartilage ofthe larynx

b. Insertion: body and greater cornu ofthe hyoid

6 Action: depression ofthe hyoid and elevation and depression of the larynx and pharynx, motions used m vocalization and deglutition

7. Innervation: ansa cervicalis, a motor nerve loop derived from the ce
cal plexus