Infrahyale Musculatur

The infrahyoidale muskulatur, consists of the Musculus sternohyoideus, Musculus sternothyroideus, Musculus thyrohyoideus and Musculus omohyoideus. These muscles all thogether are of significance in regards to swallowing. They all together divert the hyoid bone down and - except for the Musculus thyrohyoideus - also the voice box and also play a role wiht phonation. The Musculus thyrohyoideus on the other hand diverts the voice box up, given the hyoid bone is fixated. Further the Musculus omohyoideus spans the Lamina pretrachealis of the throat fascia, which is connected with it's between tendon.

Cervical Spine(CS)

Infrahyale Muscles

Musculus omohyoideus

Origin
Venter inferior:
Margo superior of the scapula (shoulder blade) between Angulus superior and Incisura scapulae
Projection
Venter superior:
Caudal edge of the outer surface of the side section of the hyoid bone body.
Function
Auxiliary muscle with breathing and swallowing
Innervation
Ansa cervicalis profunda (Plexus cervicalis)

Musculus sternohyoideus

Origin
Backside sternum (Manubrium sterni) and Sternoclavicular joint
Projektion
Hyoid bone
Function
pulls the hyoid bone down (keeps the hyoid bone in place), shifts voice box and hyoid bone down.
Innervation
Ansa cervicalis (Plexus cervicalis), as well as C4

Musculus sternothyroideus

Origin
Backside of the sternum (Manubrium sterni)
Projection
thyroid cartilage (Cartilago thyroidea)
Function
pulls the hyoid bone down (keeps the hyoid bone in place), shifts voice box and hyoid bone down
Innervation
Ansa cervicalis (Plexus cervicalis), as well as C4

Musculus thyrohyoideus

Origin
Voice box (Cartilago thyroidea)
Projection
Hyoid bone
Function
Pulling down of the hyoid bone
Innervation
Ramus thyrohyoideus radicis superioris ansae cervicalis profundae
Spinale Segmente
C1 origin: thyroid cartilage. Serves as continuation of the des M. sternothyroideus.

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