Dorsal Muscles

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They are divided into a medial and a lateral tract. In contrast to all other sceletal muscles of the human body, the autochtonous dorsal muscles are innervated by the posterior branches of the spinal nerves. As a whole, the autochtonous dorsal muscles are also called erector spinae muscles..The muscles of the back in general, including the thoracoappendicular muscles attaching the shoulder girdle to the trunk posteriorly, the posterior serratus muscles, and the erector spinae and transversospinalis muscles..The deep peroneal nerve L5-S1 is responsible for the innervation. The two muscles are: Extensor digitorum brevis muscle: originates at the calcaneus and divides into three muscle bellies whose tendons insert at the dorsal aponeurosis and the middle phalanges of the second to fourth toes..

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