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The ansa cervicalis (or ansa hypoglossi in older literature [citation needed]) is a loop formed by muscular branches of the cervical plexus formed by branches of cervical spinal nerves C1-C3. The ansa cervicalis has two roots - a superior root (formed by branch of C1) and an inferior root (formed by union of branches of C2 and C3) - that unite ...
The thyrohyoid branch [1] (also: thyrohyoid branch of ansa cervicalis, [2] or nerve to thyrohyoid (muscle) [2] [3]: 595, 600 ) is a motor branch derived from the cervical plexus [2] [2] [3]: 595, 600 [4]: 457, 709 formed by fibres of (the anterior ramus of [3]: 600 ) the cervical spinal nerve 1 (C1) [3]: 582 [5] [6] [4]: 457, 709 (and - according to some sources - cervical spinal nerve 2 (C2 ...
ansa cervicalis [1]: 546, 576, 578 (usually embedded within the anterior wall of the carotid sheath anterior to the internal jugular vein; [7] the superior root of ansa cervicalis is situated either anterior to or within the carotid sheath [1]: 595 ), deep cervical lymph nodes [4]: 148 [8] [2] [1]: 593
It is a part of the ansa cervicalis along with the C1 and C3 nerves sometimes forming part of superior root of the ansa cervicalis. [2] it also connects into the inferior root of the ansa cervicalis with the C3. [2] It originates from the spinal column from above the cervical vertebra 2 (C2).
Nerve to thyrohyoid - fibres from C1 that run with the hypoglossal nerve (cranial nerve XII) and do not participate in the formation of the superior root of ansa cervicalis, instead continuing for some further distance to reach and innervate the thyrohyoid muscle and the geniohyoid muscle.
Ansa cervicalis: Thyrohyoid: Oblique line of the thyroid cartilage: Lower border of the body and the greater cornu of the hyoid bone: Cervical spinal nerve 1 via the hypoglossal nerve: Omohyoid (superior belly) Intermediate tendon: Hyoid bone: Superior root of ansa cervicalis Omohyoid (inferior belly) Superior border of scapula: Intermediate tendon
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The thyrohyoid muscle is innervated (along with the geniohyoid muscle [1] [3]: 457, 709 ) by a branch of the cervical plexus [4] [3]: 538 - the nerve to thyrohyoid muscle (thyrohyoid branch of ansa cervicalis) [4] - which is formed by fibres of the cervical spinal nerve 1 (C1) [1] [2] [3]: 538 (and - according to some sources - cervical spinal nerve 2 as well [4] [3]: 457 ) that join and ...