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
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 .
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.