myotome

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my·o·tome

 (mī′ə-tōm′)
n.
1. A segmental mass of mesoderm in a vertebrate embryo that differentiates into skeletal muscle.
2. A muscle or group of muscles derived from one somite and innervated by a single segment of a spinal nerve.
3. A knife for dividing muscle during surgery.

myotome

(ˈmaɪəˌtəʊm)
n
1. (Zoology) any segment of embryonic mesoderm that develops into skeletal muscle in the adult
2. (Zoology) any of the segmentally arranged blocks of muscle in lower vertebrates such as fishes
References in periodicals archive ?
In the needle electromyographic study of bilateral C5-6-7-8 cervical myotomes, spontaneous denervation findings were absent, neurogenic changes in motor unit potentials and a decrease in the number of motor units ignited were observed.
Hirayama disease is a rare self-limited condition characterized by asymmetric muscle weakness and amyotrophy of the distal upper limbs involving the C7-T1 myotomes. The pathologic findings implicate circulatory changes in the lower cervical cord, which causes ischemic changes in the anterior horn.
Detailed needle electromyography investigation including left C5-8-T1 myotomes (deltoid, biceps brachii, triceps, 1st dorsal interosseous) were normal, which warranted a re-assessment of the diagnosis.
These myoblasts eventually migrate out of the last five cervical and the first thoracic myotomes into the developing limb buds.
Whereas exclusion criteria included LBP due to specific pathology, patients with neurological deficits in lower limbs with decreased power in myotomes or decreased sensation in dermatomes, patients with neurological diseases (like Stroke, Parkinsonism), any clinical condition that contra indicated mobilization, history of spinal surgery and patients administered epidural injections.
EMG revealed features of active denervation in the form of fibrillations in five patients and fasciculations in nine patients and features of chronic denervation in the form of neurogenic changes in C7, C8 and T1 myotomes in all the patients.
However, the lack of well-defined myotomes or segments of the dorsal storage chamber, reflects their juvenile stage, which inhibits the clarification to a species level.
A number of signaling molecules have been characterized to play critical roles for specification and differentiation from the somite to the myotomes [12,13].
Lower limb examination revealed reduced power bilaterally (1-2/5) across all myotomes with hyperreflexia, clonus, and upgoing plantar reflexes.
Fish muscle can be structurally divided into myotomes, which are separated by connective tissue called myocomma or myoseptum [21].
At 17.3 hours, three to four myotomes and an optic vesicle were formed (Fig.
(6) Furthermore, in the study conducted by Imamura et al., (5) PPT values of myotomes, sclerotomes and dermatomes between L1 and S3 segments were evaluated and lower PPT values were reported in CLBP patients.