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Biomedical subjects

E Teig

Publications and source records attributed to E Teig.

25 records · Page 2Linked to original sources
PubMedDate not supplied

Actomyosin ATPase activity of human laryngeal muscles.

The muscles from seven human larynxes removed by laryngectomy have been examined for actomyosin ATPase by histochemical methods. The various muscles contained a mixture of ATPase low (type I) and ATPase high (type II) muscle fibres. The thyreoarytenoid muscle had the highest proportion of type II fibres (65%) and the posterior cricoarytenoid muscle had the highest proportion of type I fibres (67%). The other laryngeal muscles had intermediate valves. All human laryngeal muscles had a higher percetage of type I fibres than the corresponding muscles in animals so far examined, a finding which may be related to the development of speech.

Actomyosin↗
PubMedDate not supplied

Histochemical characteristics of the tensor tympani muscle in relation to the medial gastrocnemius muscle of the cat.

Serial 10-micron cryostat cross-sections of the tensor tympani muscle and of the medial gastrocnemius muscle from adult domestic cats were incubated for myofibrillar ATPase, NADH tetrazolium reductase (NADH-TR), succinic dehydrogenase (SDH), malate dehydrogenase (MDH) and menadione-linked alpha-glycerophosphate dehydrogenase (alpha GPDH). The optical density of individual tensor tympani and gastrocnemius muscle fibres after different incubation procedures was measured photometrically. The absorbance values of the tensor tympani fibres were related to the values of the type I, type IIA and type IIB fibres of the gastrocnemius muscle. Only two different types of fibre could be demonstrated in the tensor tympani, one type resembling the type I and another resembling the type IIA of the gastrocnemius muscle. The findings are discussed in relation to other, recent immunohistochemical studies on cat tensor tympani muscle fibres.

Animals↗
PubMedDate not supplied

The histochemistry of the posterior cricoarytenoid (PCA) muscle in the dog, compared with the diaphragm, the sternothyroid and the sternomastoid muscle.

The canine posterior cricoarytenoid (PCA) muscle was compared histochemically with pieces of the diaphragm (Dia), an infrahyoid muscle (the sternothyroid, ST), and with a reference skeletal muscle (the sternomastoid, SM) taken from the same animal. The muscle fibre type composition in the PCA, Dia and ST differed very little and showed a slight type II preponderance. In the SM there was a strong type II preponderance. A subgrouping of the type II muscle fibres could not be carried out in any of the muscles. The oxidative activity was greater in the PCA than in the other three muscles and greater in type I than in type II fibres for all muscles except the Dia. In the Dia, some type I fibres had a larger cross-sectional area and showed a greater oxidative activity and contained less glycogen than the rest of the type I fibres in the muscle. These fibres seemed to represent a separate subgroup of type I fibres possibly serving quiet respiration.

Adenosine Triphosphatases↗
PubMedDate not supplied

The human posterior cricoarytenoid (PCA) muscle and diaphragm. A histochemical comparison as a basis for reinnervation attempts.

PCA (posterior cricoarytenoid) muscles and biopsies from the SCM (sterno-cleidomastoid) muscles as well as the diaphragm were serially sectioned and incubated for myofibrillar ATPase and selected metabolic enzymes. The three main fibre types were present in all muscles, although some PCA muscles seemed to lack IIB fibres. The mean fibre type pattern of the PCA muscle was 57% type I, 36% type IIA and 7% type IIB, as compared with 42% type I, 42% type IIA and 16% type IIB in the diaphragm. All fibre types of the PCA muscle and the diaphragm were significantly more oxidative and less glycolytic than the corresponding SCM muscle fibres. Most striking was the finding of high 3-HBDH activity in the PCA and diaphragm muscle fibres, especially in type I.

Adenosine Triphosphatases↗
PubMedDate not supplied

Experimental laryngeal reinnervation by phrenic nerve implantation into the posterior cricoarytenoid muscle.

Under general anaesthesia, 5 dogs underwent sectioning of the right recurrent nerve followed by implantation of the phrenic nerve into the posterior cricoarytenoid (PCA) muscle. Some 6-7 months later the dogs were sacrificed after registration of vocal cord motility. Still photographs and movie film of the larynx were taken during quiet and forced respiration and at electrical stimulation of the implanted phrenic nerve. The PCA and vocal muscles were removed for histochemical studies. We found practically no abductory movement of the vocal cord on the reinnervated side, either during quiet or forced respiration. During forced inspiration there was, however, a slight medial bowing of the right vocal cord. At electrical stimulation there was a sphincteric movement of the entire larynx. Histochemistry showed a reinnervation picture of both the PCA and the vocal muscles on the experimental side. The conclusion drawn from this study is that axonal escape, probably from the implantation site, results in an unwanted reinnervation of laryngeal adductor muscles, which neutralize the abducting effect of the PCA muscle during inspiration. This method therefore does not seem to be suitable as a treatment alternative for bilateral recurrent nerve paralysis.

Adenosine Triphosphatases↗