Biomedical subjects

Ki-Seok Koh

Publications and source records attributed to Ki-Seok Koh.

6 recordsLinked to original sources

PubMed2006

A new model for the morphology of the arrector pili muscle in the follicular unit based on three-dimensional reconstruction.

In the classic model of the arrector pili (AP) muscle, each hair follicle is independently associated with a single AP muscle. Recently, new models have been proposed based on interpretations of serial histological cross-sectional images. The purpose of this study was to confirm the morphology of the AP muscle in relation to the follicular unit (FU) using quantitative three-dimensional (3D) reconstruction of serially sectioned images. Skin samples were obtained from the parietal region of the scalp, and processed using routine histological procedures. The serially sectioned slides were stained with Masson's trichrome. All the hairs and hair follicles of the FU exhibited some degree of slanting, with the single AP muscle slanted in the same direction. The distal portion of the AP muscle was divided into branches, as in a bronchial tree. There was branching in the single AP muscle present in the FU, and it was inserted into all the hair follicles of the FU either tightly or loosely. We suggest that the classic anatomy of the AP muscle must be modified with this new model, now confirmed by computer-based 3D reconstruction.

Adult↗

PubMed2006

Sex determination using nonmetric characteristics of the mandible in Koreans.

The mandible is the largest and hardest facial bone and retains its shape better than other bones in the forensic and physical anthropologic field. The mandible can be used to distinguish among ethnic groups and between sexes. We examined the morphological characteristics of the mandibles of 102 Koreans of either sex. Of 13 nonmetric items of the mandible, the characteristic that best allowed the sexes to be distinguished was the contour of the lower border of the mandible: rocker-shaped mandibles predominated in males (68.1%), whereas most females (84.6%) exhibited a straight mandible. In addition, the mental region was shaped differently between the sexes: the shape of the chin in most males was generally bilobate or square (91.7%), whereas the chin in females was either square (45.5%) or pointed (54.5%). In this study, the positive predict values of male and female were 92.5% and 73.7%, respectively. Therefore, the nonmetric method used to analyze the mandible in this study can be used for sex discrimination.

Adolescent↗

PubMed2005

Multiunit arrector pili muscular structure as a variation observed by using computer-based three-dimensional reconstruction.

The arrector pili (AP) muscle was recently suggested to comprise one AP muscular unit inserted into all the hair follicles contained within the follicular unit (FU). This study investigated the presence of variations in AP muscular units associated with the FUs. Human cadaver scalp skin specimens were serially sectioned and stained with Masson's trichrome. Three-dimensional reconstructions of the serially sectioned images were analyzed on a computer, which revealed two types of variation in 20 FUs, one of which was the multiunit AP muscular structure, in which the AP muscular unit was inserted into two or more FUs.

Hair Follicle↗

PubMed2005

Kirner's deformity: progressiveness and classification.

In a 30-year-old man, bilateral Kirner's deformity has been diagnosed. In the fully extended finger, the long axes of the middle and terminal phalanges formed an angle of 10 degrees in the volar and 5 degrees in the radial direction. Owing to the altered morphology of the distal phalanx, its palmar surface was at an angle of 25 degrees to the long axis of the middle phalanx. The deformity has existed since birth and has not changed except in size. His mother had the same bilateral deformity. Other closer relatives showed a unilateral appearance of Kirner's deformity: his maternal grandmother and an uncle had in their right little finger and an aunt had in her left little finger. Although some authors reported that Kirner's deformity was progressive, the description only referred to a change in the deformity. Kirner's deformity may be classified according to its period of onset, i.e., a more frequently occurring early type and a late type of onset (with lower incidence) exists. Moreover, it can be further classified by typical morphologic changes as well as the family history of the affected person.

Adult↗

PubMed2003

A variation of the musculocutaneous nerve absent.

A variation of the brachial plexus, characterized by the absence of the musculocutaneous nerve on the left arm, was found during the dissection of a 28-year old male cadaver. The whole lateral cord was joined to the median nerve, which it met in two points. One was a typical junction of both roots of the median nerve at the level of the coracoid process. The other was a junction of the remaining lateral cord and the median nerve, which was 92 mm away from the typical junction. This case provided some evidence about the absence of the musculocutaneous nerve, rather than a complete fusion of the median and musculocutaneous nerves. As the nerves are named due to their course or innervation, and not from their origin, it is reasonable to assume that the combined nerve was actually the median nerve, and that the musculocutaneous nerve did not exist.

Adult↗

PubMed2002

Anatomic variations of the T2 nerve root (including the nerve of Kuntz) and their implications for sympathectomy.

OBJECTIVE: The aim of this study was to clarify the anatomic variations of the intrathoracic nerve of Kuntz, and this should help delineate the resection margins during video-assisted thoracic sympathectomy. METHODS: Sixty-six thoracic sympathetic chains of 39 adult Korean cadavers were dissected on both sides of the thorax in 27 cadavers (54 sides) and on one side in 12 cadavers (12 sides). RESULTS: The intrathoracic nerve was observed in 45 (68.2%) sides and was present bilaterally in 48.1% of cadavers. No intrathoracic nerve or ascending ramus communicans arising from the second thoracic nerve was observed in only 5 (7.6%) sides. The diameter of the intrathoracic nerve was 1.25 plus minus 0.55 mm on average. The arising point of the intrathoracic nerve from the second thoracic nerve was 7.3 mm on average from the sympathetic trunk. Presence of the stellate ganglion was noted in 56 (84.8%) sides, and 6 (9.1%) sides showed a single large ganglion formed by the stellate and the second thoracic sympathetic ganglia. The second thoracic sympathetic ganglion was most commonly located (50%) in the second intercostal space. CONCLUSION: The anatomic variations of the intrathoracic nerve of Kuntz and the second thoracic sympathetic ganglion were characterized in human cadavers. It is hoped that this study will help to improve the recurrence of symptoms caused by the intrathoracic nerve in an upper thoracic sympathectomy for hyperhidrosis.

Female↗