What does the ansa cervicalis innervate?
The ansa cervicalis, which innervates the infrahyoid muscles, is a neural complex in the neck formed by the combination of the ventral rami of the first three or four cervical spinal nerves. It is comprised of both superior and inferior roots.
Which cranial nerve runs with the ansa cervicalis?
hypoglossal nerve
Note that the thyrohyoid muscle, which is also an infrahyoid muscle and the geniohyoid muscle which is a suprahyoid muscle are innervated by cervical spinal nerve 1 via the hypoglossal nerve….
| Ansa cervicalis | |
|---|---|
| TA2 | 6376 |
| FMA | 55142 |
| Anatomical terms of neuroanatomy |
Is ansa cervicalis motor or sensory?
The motor portion of the cervical plexus lies deep to the sensory portion and is located within the anterior triangle of the neck. The motor portion comprises the ansa cervicalis (see Fig. 5-33).
What are the motor branches of plexus cervicalis and zones of their innervation?
Its branches consist of a superficial and deep set. The superficial branches are the great auricular nerve, lesser occipital nerve, transverse cervical, suprasternal, and supraclavicular nerves. The deep branches are the phrenic, communicantes cervicales, communicating, and muscular.
How is ansa cervicalis formed?
Ansa cervicalis complex, which innervates the infrahyoid muscles, is formed by the union of two roots derived from the anterior primary rami of the first three or four cervical spinal nerves. According to its relationship with the internal jugular vein, there are three ansa types: medial, lateral, or mixed.
What are the roots of ansa cervicalis?
Ansa cervicalis
| Origin | Superior root (anterior rami of C1-C2) Inferior root (anterior rami of C2-C3) |
|---|---|
| Branches | Muscular branches to omohyoid, sternohyoid, sternothyroid |
| Supply | 3 /4 infrahyoid muscles: Omohyoid, sternohyoid, sternothyroid |
What are the roots of ANSA Cervicalis?
Which nerve supplies the Infrahyoid muscles?
The ansa cervicalis supplies the infrahyoid muscles. The thyrohyoid, however, receives its cervical fibers by way of the hypoglossal nerve.
How is ANSA Cervicalis formed?
What is the superficial cervical plexus?
The superficial cervical plexus innervates the skin of the anterolateral neck (see Figure 3). The terminal branches emerge as four distinct nerves from the posterior border of the sternocleidomastoid muscle. The lesser occipital nerve is usually a direct branch from the main stem of the second cervical nerve.
What nerve Innervates the Omohyoid muscle?
The omohyoid muscle is an infrahyoid muscle of the neck that is innervated by the ansa cervicalis of the cervical plexus receiving fibers from the ventral rami of C1–C3 spinal nerves.