Myasthenia Gravis is a chronic disease characterized by excessive fatiguability of striated muscle. The illness has a tendency to exacerbation and to the periods of spontaneous remission. The auther observed a case of ocular myasthenia gravis who has gained spontaneous remission 5 years after from the onset, and reviewed the references related to this disease.
Chronic Disease ; Muscle, Striated ; Myasthenia Gravis* ; Remission, Spontaneous

To investigate why the development of a completely circular striated sphincter is so rare, we examined histological sections of 11 female and 11 male mid-term human fetuses. In male fetuses, the striated muscle initially extended in the frontal, rather than in the horizontal plane. However, a knee-like portion was absent in the female fetal urethra because, on the inferior side of the vaginal end, a wide groove for the future vestibule opened inferiorly. Accordingly, it was difficult for the developing striated muscle to surround the groove, even though there was not a great difference in width or thickness between the female vestibule and the male urethra. The development of a completely circular striated sphincter seems to be impossible in females because of interruption of the frontal plane by the groove-like vestibule. However, we cannot rule out the possibility that before descent of the vagina, the urethral striated muscle extends posteriorly.
Female ; Fetus ; Humans ; Male ; Muscle, Striated ; Urethra ; Vagina

To investigate why the development of a completely circular striated sphincter is so rare, we examined histological sections of 11 female and 11 male mid-term human fetuses. In male fetuses, the striated muscle initially extended in the frontal, rather than in the horizontal plane. However, a knee-like portion was absent in the female fetal urethra because, on the inferior side of the vaginal end, a wide groove for the future vestibule opened inferiorly. Accordingly, it was difficult for the developing striated muscle to surround the groove, even though there was not a great difference in width or thickness between the female vestibule and the male urethra. The development of a completely circular striated sphincter seems to be impossible in females because of interruption of the frontal plane by the groove-like vestibule. However, we cannot rule out the possibility that before descent of the vagina, the urethral striated muscle extends posteriorly.
Female ; Fetus ; Humans ; Male ; Muscle, Striated ; Urethra ; Vagina

PURPOSE: The aim of the study was to clarify the anatomy of the male rat urethra, and to establish a more accurate and consistent method for analyzing external urethral sphincter (EUS) contractility based on this clarified anatomy by comparing different muscle strip orientations. MATERIALS AND METHODS: The whole urethra in male rats was investigated histologically using H/E and immunohistochemical staining. The contractility of the spiral (S) orientation of the entire proximal urethral (EUS) was then compared with the transverse (T) and the ring (R) orientations of the optimal portion, via electrical stimulation in an organ bath. RESULTS: In male rats, the urethral tract consisted of following parts: proximal urethra, transient urethra, urethral diverticula, and penile urethra. Throughout the proximal urethra, a layer of striated muscle fibers encircled the smooth muscle layers. The EUS contraction of the S, TM (Transverse, Middle of proximal urethra) and RM (Ring, Middle of proximal urethra) groups were 4.66+/-0.33mN, 2.92+/-0.33mN and 2.47+/-0.38mN, respectively. The strength of the EUS contraction of the S group was significantly higher than that of the TM. Group, but after adjusting the length, there was no statistically significant difference between the two groups. CONCLUSIONS: Unlike previous studies, showing striated muscle fibers limited to the lower half of the proximal urethra, we noted them throughout the whole proximal urethra. From our results, the spiral orientation of the entire urethra was found to be the optimal configuration for evaluating the contractility of the EUS using fast twitch muscle contractile testing.
Animals ; Baths ; Diverticulum ; Electric Stimulation ; Humans ; Male* ; Muscle, Smooth ; Muscle, Striated ; Rats* ; Urethra*

Granular cell tumor is an uncommon benign tumor derived from Schwann cells. The most common location is the tongue, followed by striated muscle bundles at other sites, and the skin. About 6-8% of granular cell tumors occur in the breast. We report the sonographic findings of a case of graunlar cell tumor occurring at that site.
Breast* ; Granular Cell Tumor* ; Muscle, Striated ; Schwann Cells ; Skin ; Tongue ; Ultrasonography

Voiding functions in patients with non-neoplastic and non-traumatic myelopathy take a variable course according to severity and duration of disease. Fifteen patients of non-neoplastic and non-traumatic myelopathy were investigated neurologically thoroughly. On M.R.I. findings, hyperintense lesion was notified in a half of them but the others were nonspecific. On Pressure-Flow-EMG studies there were 7 cases of detrusor hyperreflexia with DSD, 2 cases of detrusor hyporeflexia with nonrelaxing striated muscle, 1 cases of detrusor hyporeflexia with coordinated striated muscle and 3 cases of normal findings. The thorough examination including M.R.I. and urodynamic study will be needed in patient with non-neoplastic and non-traumatic myelopathy because future possibility of their serious complications such as deterioration of renal function or impotence.
Erectile Dysfunction ; Humans ; Male ; Muscle, Striated ; Reflex, Abnormal ; Spinal Cord Diseases* ; Urodynamics*

Rhabdomyosarcoma is the most common sarcoma of children and adolescents. Rhabdomyosarcoma is a highly malignant soft tissue sarcoma that can arise in any site of the body containing striated muscle or its mesenchymal analogue. The common primary sites were head and neck including orbit, extremities, genitourinary tract, trunk, retroperitoneum, gastrointestinal tract, and thorax. There are basically three types of rhabdomyosarcoma: embryonal, alveolar, and pleomorphic; these categories may overlap histologically. Retroperitoneal rhabdomyosarcoma of embryonal type is rarely reported in an adult. Since we experienced a case of 25 X 20 X 12cm-sized retroperitoneal rhabdomyosarcoma of embryonal type, we report this with a review of literatures.
Adolescent ; Adult* ; Child ; Extremities ; Gastrointestinal Tract ; Head ; Humans ; Muscle, Striated ; Neck ; Orbit ; Rhabdomyosarcoma* ; Sarcoma ; Thorax

The repair of striated muscle after acute trauma occurs simultaneously by the regeneration of disrupted muscle and formation of connective scar. But, there had been no attention concerning effects of local anesthetics on the degeneration and regeneration process of the injured muscle. The author induced a constant contusion injury on the calf of rats. Lidocaine and/or epinephrine was intramuscularly injected at the site of injury. Morphological and histochemical observation was conducted and the results were as follows: 1. Traumatized striated muscle showed evidences of the healing process for upto 90 days. 2. Morphological and histochemical changes in the traumatized muscle became more severe after the injection of lidocaine and/or epinephrine. 3. Formation of collagenous scar tissue significantly increased after injection of lidocaine and/or epinephrine. Injection of lidocaine or epinephrine developed similar amount of scar after 15 days. 4. Cross section area of the regenerated muscle fibers decreased in the injection groups than in the control groups. Atrophy was significant on day 90 in all types of fiber after injection of the mixture of lidocaine and epinephrine, and in type B after injection of epinephrine. In conclusion, injection of the lidocaine and epinephrine inhibited regeneration of the traumatized striated muscle. Mixture of the drugs showed more inhibitory effect than a single drug.
Anesthetics, Local ; Animals ; Atrophy ; Cicatrix ; Collagen ; Contusions ; Epinephrine ; Lidocaine ; Muscle, Striated ; Rats ; Regeneration

Rhabdomyosarcoma which was first described by Weber has generally been considered an uncommon tumor of striated muscle. Recently it was classified as four types as embryonal, alveolar, pleomorphic, and botryoid type by Horn and Enterline. A fourth type, sarcoma botryoides was generally recognized as a variant of the embryonal type. Al1 of these tumors tend to have a short clinical course, but the survival time seems to be slightly improved by sugical excision followed by radiotherapy and chemotherapy. Authors report one case of rhabdomyosarcoma, which was seen in the right lower leg and showed a rapid growing nature to die, which experienced in Busan National University Hospital, February, 1983.
Animals ; Busan ; Drug Therapy ; Horns ; Humans ; Infant, Newborn ; Leg ; Muscle, Striated ; Radiotherapy ; Rhabdomyosarcoma ; Rhabdomyosarcoma, Embryonal ; Sarcoma

Fibromatosis colli is a benign fibrous tissue proliferation of sternocleidomastoid muscle, which is usually observed during the first month of life, often associated with congenital torticollis. It should be differentiated from other neck masses in infants because the usual initial treatment of fibromatosis colli is conservative management and invasive therapy should be avoided. Fine needle aspiration cytology provides an excellent minimally invasive diagnostic way for evaluation of infantile neck masses. We describe three cases of fibromatosis colli diagnosed by fine needle aspiration cytology. All of them were younger than one month and presented as a neck mass. Clinical impressions were malignant tumors in two cases and fibromatosis colli in one case. Fine needle aspiration cytology revealed benign and mature fibroblasts and atrophic striated muscle fibers. The cytologic diagnosis was fibromatosis colli or benign fibous lesion.
Biopsy, Fine-Needle* ; Diagnosis ; Fibroblasts ; Fibroma* ; Humans ; Infant ; Muscle, Striated ; Neck ; Torticollis