Sternothyroid muscle

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Sternothyroid muscle

Sternothyroid visible center left

Section of the neck at about the level of the sixth cervical vertebra. Showing the arrangement of the fascia coli. (Sternothyroideus labeled at right, third from top.)
Latin	musculus sternothyroideus
Gray's	p.393
Origin	manubrium
Insertion	thyroid cartilage
Artery	superior thyroid artery
Nerve	Ansa cervicalis
Actions	[depresses thyroid cartilage]

The Sternothyreoideus (or Sternothyroid muscle) is shorter and wider than the Sternohyoideus, beneath which it is situated.

It arises from the posterior surface of the manubrium sterni, below the origin of the Sternohyoideus, and from the edge of the cartilage of the first rib, and sometimes that of the second rib, it is inserted into the oblique line on the lamina of the thyroid cartilage.

This muscle is in close contact with its fellow at the lower part of the neck, but diverges somewhat as it ascends; it is occasionally traversed by a transverse or oblique tendinous inscription.

Variations

Doubling; absence; accessory slips to Thyreohyoideus, Inferior constrictor, or carotid sheath.

Additional images

Superficial dissection of the right side of the neck, showing the carotid and subclavian arteries.
The fascia and middle thyroid veins.
Hypoglossal nerve, cervical plexus, and their branches.
Side view of the larynx, showing muscular attachments.
Sternothyroid muscle

External links

LUC sthr
Photo of model at Waynesburg College musclehead/sternothyroid
25:03-0105 at the SUNY Downstate Medical Center - "The Muscular triangle"
PTCentral

This article incorporates text from a public domain edition of Gray's Anatomy.

List of muscles of head and neck: the neck (TA A04.2, GA 4.387)

Cervical

CN VII (superficial, PC): platysma
CN XI (deep): sternocleidomastoid

C1–C6 (anterior): Prevertebral muscles: longus (capitis, colli)

C3–C8 (lateral): scalene (anterior, medius, posterior)

Suboccipital

C1: rectus capitis posterior (major, minor) · obliquus capitis (inferior, superior)

C1–C6 (anterior): Prevertebral muscles: rectus capitis (anterior, lateralis)

Suprahyoid

CN V3 (medial): mylohyoid · anterior belly of digastric

CN VII (lateral): stylohyoid · posterior belly of digastric

C1 (deep): geniohyoid

Infrahyoid/strap

C1: thyrohyoid
C1–C3: sternohyoid · sternothyroid · omohyoid

Fasciae

Deep cervical fascia (Pretracheal fascia, Prevertebral fascia, Investing layer) · Carotid sheath · Alar fascia

pharynx: Buccopharyngeal fascia · Pharyngobasilar fascia

Palatine aponeurosis

Pharyngeal raphe

Pharynx

pharyngeal constrictor (superior, middle, inferior) · longitudinal (stylopharyngeus, salpingopharyngeus)

Larynx

cricothyroid · cricoarytenoid (posterior, lateral) · arytenoid (oblique arytenoid/aryepiglottic, transverse arytenoid) · thyroarytenoid (vocal, thyroepiglottic)

M: MUS, DF+DRCT

anat (h/n, u, t/d, a/p, l)/phys/devp/hist

noco (m, s, c)/cong (d)/tumr, sysi/epon, injr

proc, drug (M1A/3)

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