Corpus: Deep cervical ansa: Unterschied zwischen den Versionen
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==Definition== | ==Definition== | ||
The '''deep cervical ansa''' is a nerve loop formed by a superior radix from the C1 and C2 segments and an inferior radix from the C2 and C3 segments of the cervical plexus. | The '''deep cervical ansa''' is a nerve loop formed by a superior root (radix superior) originating from the C1 and C2 segments, and an inferior root (radix inferior) originating from the C2 and C3 segments of the [[Corpus:Cervical plexus|cervical plexus]]. | ||
<dcembed ratio="16x9" caption=" 3D model of the nerves of the head. The ansa cervicalis is labeled with the number 18."><dcEmbedUrl src="https://sketchfab.com/3d-models/model-leitungsbahnen-nerven-135d4b10cc2346888a0ef55c28b92054"></dcEmbedUrl></dcembed> | <dcembed ratio="16x9" caption=" 3D model of the nerves of the head. The ansa cervicalis is labeled with the number 18."><dcEmbedUrl src="https://sketchfab.com/3d-models/model-leitungsbahnen-nerven-135d4b10cc2346888a0ef55c28b92054"></dcEmbedUrl></dcembed> | ||
==Function== | ==Function== | ||
The cervical | The deep cervical ansa provides motor innervation to the entire [[Corpus:Infrahyoid musculature|infrahyoid musculature]] through its nerve branches, which include: | ||
* thyrohyoid muscle | |||
* sternohyoid muscle | * the [[Corpus:Thyrohyoid muscle|thyrohyoid muscle]] | ||
* sternothyroid muscle | * the [[Corpus:Sternohyoid muscle|sternohyoid muscle]] | ||
* omohyoid muscle | * the [[Corpus:Sternothyroid muscle|sternothyroid muscle]] | ||
Some | * the [[Corpus:Omohyoid muscle|omohyoid muscle]] | ||
Some fibers from the superior root (radix superior) reach the thyrohyoid muscle via the [[Corpus:Hypoglossal nerve|hypoglossal nerve]], forming the [[Corpus:Thyrohyoid branch|thyrohyoid branch]] (ramus thyrohyoideus). Additionally, the superior root is the only pathway that supplies the [[Corpus:Geniohyoid muscle|geniohyoid muscle]], a [[Corpus:Suprahyoid muscle|suprahyoid muscle]]. | |||
==Topography== | ==Topography== | ||
The | 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 trigonum caroticum, the | In the [[Corpus:Carotid triangle|carotid triangle]] (trigonum caroticum), fibers from the superior root run a short distance with the hypoglossal nerve as the "ramus descendens nervi hypoglossi," although they do not exchange fibers with it, despite being referred to as the "[[Corpus:Ansa hypoglossi|ansa hypoglossi]]." | ||
The | The fibers of the inferior root (radix inferior) run medially alongside the phrenic nerve as the [[Corpus:Descending cervical nerve|descending cervical nerve]]. The superior and inferior roots join together below the [[Corpus:Intermediate tendon|intermediate tendon]] of the [[Corpus:Omohyoid muscle|omohyoid muscle]] to form the [[Corpus:Ansa cervicalis|cervical loop (ansa cervicalis).]] | ||
The superficial cervical | The superficial cervical ansa, in contrast, lies on the sternocleidomastoid muscle, just beneath the [[Corpus:Platysma|platysma]]. | ||
[[Kategorie:Corpus]] | [[Kategorie:Corpus]] | ||
[[Kategorie:Neck]] | [[Kategorie:Neck]] | ||
[[Kategorie:Nerve]] | [[Kategorie:Nerve]] | ||
Version vom 9. August 2024, 14:00 Uhr
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Synonyms: deep cervical nerve loop, cervical ansa, ansa hypoglossi
Definition
The deep cervical ansa is a nerve loop formed by a superior root (radix superior) originating from the C1 and C2 segments, and an inferior root (radix inferior) 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 (radix superior) 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 (trigonum caroticum), fibers from the superior root run a short distance with the hypoglossal nerve as the "ramus descendens nervi hypoglossi," although they do not exchange fibers with it, despite being referred to as the "ansa hypoglossi."
The fibers of the inferior root (radix inferior) 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.