Corpus: Deep cervical ansa: Unterschied zwischen den Versionen
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''Synonyms: deep ansa cercivalis, ansa hypoglossi'' | ''Synonyms: deep ansa cercivalis, ansa hypoglossi'' | ||
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* the [[Corpus:Omohyoid muscle|omohyoid muscle]] | * the [[Corpus:Omohyoid muscle|omohyoid muscle]] | ||
Some fibers from the superior root | Some fibers from the superior root reach the thyrohyoid muscle via the [[Corpus:Hypoglossal nerve|hypoglossal nerve]], forming the thyrohyoid branch (ramus thyrohyoideus). Additionally, the superior root is the only pathway that supplies the [[Corpus:Geniohyoid muscle|geniohyoid muscle]], a suprahyoid muscle. | ||
==Topography== | ==Topography== | ||
The deep cervical ansa is located beneath the [[Corpus:Sternocleidomastoid muscle|sternocleidomastoid muscle]], crossing both the [[Corpus:Internal jugular vein|internal jugular vein]] and the [[Corpus:Anterior scalene muscle|anterior scalene muscle]] along its course. | The deep cervical ansa is located beneath the [[Corpus:Sternocleidomastoid muscle|sternocleidomastoid muscle]], crossing both the [[Corpus:Internal jugular vein|internal jugular vein]] and the [[Corpus:Anterior scalene muscle|anterior scalene muscle]] along its course. | ||
In the [[Corpus:Carotid triangle|carotid triangle]] | In the [[Corpus:Carotid triangle|carotid triangle]], fibers from the superior root run briefly with the hypoglossal nerve forming the ramus descendens nervi hypoglossi, although they do not exchange fibers with it ("ansa hypoglossi"). | ||
The fibers of the inferior root | The fibers of the inferior root run medially alongside the phrenic nerve as the [[Corpus:Descending cervical nerve|descending cervical nerve]]. The superior and inferior roots join together below the intermediate tendon of the [[Corpus:Omohyoid muscle|omohyoid muscle]] to form the cervical loop ("ansa cervicalis"). | ||
The superficial cervical ansa, in contrast, lies on the sternocleidomastoid muscle, just beneath the [[Corpus:Platysma|platysma]]. | The superficial cervical ansa, in contrast, lies on the sternocleidomastoid muscle, just beneath the [[Corpus:Platysma|platysma]]. | ||
Aktuelle Version vom 7. November 2024, 14:34 Uhr
Synonyms: deep ansa cercivalis, ansa hypoglossi
Definition
The deep cervical ansa is a nerve loop formed by a superior root originating from the C1 and C2 segments, and an inferior root originating from the C2 and C3 segments of the cervical plexus.
Function
The deep cervical ansa provides motor innervation to the entire infrahyoid musculature through its nerve branches, which include:
- the thyrohyoid muscle
- the sternohyoid muscle
- the sternothyroid muscle
- the omohyoid muscle
Some fibers from the superior root reach the thyrohyoid muscle via the hypoglossal nerve, forming the thyrohyoid branch (ramus thyrohyoideus). Additionally, the superior root is the only pathway that supplies the geniohyoid muscle, a suprahyoid muscle.
Topography
The deep cervical ansa is located beneath the sternocleidomastoid muscle, crossing both the internal jugular vein and the anterior scalene muscle along its course.
In the carotid triangle, fibers from the superior root run briefly with the hypoglossal nerve forming the ramus descendens nervi hypoglossi, although they do not exchange fibers with it ("ansa hypoglossi").
The fibers of the inferior root run medially alongside the phrenic nerve as the descending cervical nerve. The superior and inferior roots join together below the intermediate tendon of the omohyoid muscle to form the cervical loop ("ansa cervicalis").
The superficial cervical ansa, in contrast, lies on the sternocleidomastoid muscle, just beneath the platysma.