In addition, the ansa cervicalis does not innervate the stylohyoid muscle, which is innervated by the facial nerve.
2.
The stylohyoid muscle, stapedius and posterior belly of the digastric muscle are also innervated by the facial nerve, but are not considered muscles of facial expression.
3.
In the neck, its origin is superficial, being covered by the integument, platysma, and fascia; it then passes beneath the digastric and stylohyoid muscles and part of the submandibular gland, but superficial to the hypoglossal nerve.
4.
After emerging from the hypoglossal canal, it gives off a small meningeal branch and picks up a branch from the anterior posterior belly of the digastric muscle, it passes to the submandibular region, passes upwards and anteriorly on the hyoglossus muscle, and deep to the stylohyoid muscle and lingual nerve.
5.
The largest of muscles that attach to the upper surface of the greater horns are the hyoglossus and the middle pharyngeal constrictor, which extend along the whole length of the horns; the digastric muscle and stylohyoid muscle have small insertions in front of these near the junction of the body with the cornu.
6.
The fascia itself is made of two layers : A superficial layer ( lat . " Lamina superficalis " ) that passes cranial into the temporal fascia and lateral into the masseteric fascia, and a deeper layer ( lat . " Lamina profunda " ) that covers the Stylohyoid muscle, the styloglossus and the Musculus stylopharyngeus.
7.
It is relatively superficial at its start, where it is contained in the carotid triangle of the neck, and lies behind and medial to the external carotid, overlapped by the sternocleidomastoid muscle, and covered by the deep fascia, the platysma, and integument : it then passes beneath the parotid gland, being crossed by the hypoglossal nerve, the digastric muscle and the stylohyoid muscle, the occipital artery and the posterior auricular artery.
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