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Biomedical subjects

H Nathan

Publications and source records attributed to H Nathan.

At least 145 records · Page 8Linked to original sources
PubMedDate not supplied

The course and relations of the hypoglossal nerve and the occipital artery.

Three main types of variations in the relations of the occipital artery and the hypoglossal nerve found in 42 dissected specimens are described, according to the level at which the nerve crosses the external carotid artery and the point of origin of the occipital artery. In Type I, the hypoglossal nerve crosses the external carotid artery inferior to the origin of the occipital artery; in Type II, the nerve crosses the external carotid artery at the level of origin of the occipital artery; and in Type III, it crosses superior to that level. In Type III the occipital artery makes a loop around the hypoglossal nerve and is in a position to pull and exert pressure on the nerve. This possibility should be taken into consideration in the diagnosis of peripheral paresis or paralysis of the tongue and during surgery in this area.

Carotid Artery, External↗
PubMedDate not supplied

Jewish populations of the world: genetic likeness and differences.

In six Jewish populations from Eastern, Central and Southern Europe, the Middle East, North Africa and Yemen, the frequencies of 30 genes from 13 loci were determined. The calculation of genetic distances between these populations as well as a cluster analysis were done. The gene frequencies of these six populations were computed together with those of 19 other Jewish populations of diverse countries described in the literature. Of the 19 populations, 22 alleles from 10 loci were checked. Gene frequencies in autochthonous, non-Jewish populations from these countries were also computed. All Jewish populations except Yemenites are concentrated in the same cluster, being closer one to another than to any of the non-Jewish groups. A similar picture is obtained when Jewish and non-Jewish populations from 19 countries are subjected to cluster analysis. The differences between the Jewish populations generally tend to bring them closer to the corresponding non-Jewish groups. The present data suggest that these differences cannot always be explained by admixture; other factors such as the effect of convergent adaptive processes must be considered.

ABO Blood-Group System↗
PubMedDate not supplied

Flexor digitorum accessorius longus.

A supernumerary muscle in the ankle joint, the flexor digitorum accessorius longus, was found in 12 of 100 cadavers (12%). The muscle originated either by 2 heads (a long and a short one) or by a single head, from any of the deep structures of the posterior compartment of the leg. It descended in the tarsal tunnel, superficially and close to the neurovascular bundle and to the tendon of the Flexor hallucis longus muscle, to insert into the tendon of the Flexor digitorus longus in the planta. During this course, the muscle very frequently preserved its fleshy fibers, and could easily be identified by this characteristic. The possibility of such a muscle being a factor of compression in a "tarsal tunnel syndrome" should be kept in mind.

Adult↗
PubMedDate not supplied

Osteophytes of the spine compressing the sympathetic trunk and splanchnic nerves in the thorax.

The presence of osteophytes compressing the sympathetic structures in the thorax was found in 655 (65.5%) of 1,000 cadavers. In 60.4% of the affected cases, the compression was on the right side, and in 36.9% it was bilateral, although the right side was more severely affected. In 2%, the compression was on the left only. The highest frequency of compression was at the T8-10 level, the right greater splanchnic nerve being the structure most frequently involved. The sympathetic trunk itself (ganglia and cord) was affected only by osteophytes of vertebrae at the lowest thoracic levels; however, bony excrescences due to costovertebral joint arthritis were frequently found impinging on the sympathetic trunk and its rami communicantes at similar frequencies on both sides. The factors governing the characteristic compression of the sympathetic structures in the thorax are the typical development of the osteophytes and the special relations of the sympathetic structures to the vertebral column at the various levels. It is proposed that these observations are useful in understanding certain observed clinical conditions and act an anatomic baseline for research in the future.

Aged↗
PubMedDate not supplied

Meralgia paresthetica. An anatomical interpretation.

One hundred and ten lateral femoral cutaneous nerves of the thigh were dissected in 90 adult and 20 fetal cadavers. In 51 per cent of adult cases a significant enlargement or pseudoganglion was present in the area of the nerve where it passed under the guinal ligament to turn sharply downward onto the thigh. The histological examination of these pseudoganglions showed a thickened epineurium, perineurium and endoneurium. No pseudoganglions and no histological abnormalities were found in the fetal nerves. It is proposed that erect human posture, combined with the particular course of the lateral femoral cutaneous nerve are the causes of tension, mechanical friction, and irritation of the nerve, and contribute to the development of the pseudoganglion and play a role in the pathogenesis of idiopathic meralgia paresthetica.

Adult↗