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| '''''Brachiocephalic m.''''': Accessory n. | | '''''Brachiocephalic m.''''': Accessory n. |
− | *Two parts separated by the clavicle where it exists | + | *Two parts separated by the clavicle |
− | *Origin: clavicle or vestigial fibrous intersection | + | *Origin: clavicle |
− | *Insertion: several places on the head and neck | + | *Insertion: median raphe of the neck and the occipital bone. The ventral part attaches to the mastoid process |
| *Actions: | | *Actions: |
| **advances the limb and extends the shoulder joint when limb is in motion | | **advances the limb and extends the shoulder joint when limb is in motion |
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| '''''Omotransversarius''''': Accessory n. | | '''''Omotransversarius''''': Accessory n. |
| *Origin: transverse processes of the atlas | | *Origin: transverse processes of the atlas |
− | *Insertion: acromion and adjacent scapula | + | *Insertion: acromion and distal spine of the scapula |
| *Action: advancing the limb | | *Action: advancing the limb |
| *Innervation | | *Innervation |
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| **caudal portion can advance the limb | | **caudal portion can advance the limb |
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− | '''''Rhomboids''''': brachial plexus, although in some species, dorsal spinal nerves can innervate | + | '''''Rhomboids''''': brachial plexus |
− | *Origin: median connective tissue from poll to withers, lying deep to the trapezius | + | *Origin: nuchal ligament, 4th - 6th thoracic spine |
| *Insertion: dorsal border and adjacent scapula | | *Insertion: dorsal border and adjacent scapula |
| *Action: retracting the limb, may also raise limb | | *Action: retracting the limb, may also raise limb |