Biomedical subjects

In-Hyuk Chung

Publications and source records attributed to In-Hyuk Chung.

5 recordsLinked to original sources

PubMed2003

An anatomic variation of the trapezius muscle in a Korean: the cleido-occipitalis cervicalis.

A variation of the trapezius muscle was observed in a Korean female adult cadaver during routine student dissection. The lateral, upper three-fourths of the descending portion of the trapezius muscle were separated from the remainder of the muscle. This single, isolated bundle fused above the insertion of the midpoint of the clavicle, and attached to the clavicle as a separate tendon. The remaining descending portion inserted into the clavicle and scapula as usual. This abnormal muscle bundle is considered as a variant of the cleido-occipitalis cervicalis, and formation of this variation is discussed based on the embryological development of the relative muscular structures.

Female↗

PubMed2003

Morphological study on the acetabular labrum.

For the diagnosis and treatment of the labral pathology, the cross sectional morphology of the labrum is needed. Fifty-four labra (male:female=44:10) from 32 adult Korean cadavers were cut in radial and perpendicular fashions to their longitudinal axis. Each labrum was divided into 8 segments, resulting 8 equally distanced points. To analyze the 432 cut surfaces, which consisted of 378 labra and 54 transverse acetabular ligaments cut surfaces, all dimensions of the cut surfaces were measured, and the attachment patterns, including the sublabral slit, observed. The shapes of the cut surfaces were classified into four types (3 subtypes of triangle and 1 quadrangle) and the attachment patterns into five types. At the anterior portion of the labrum, which other studies reported as the predilection area for labral tears, there were several common findings: 1) Tall triangular shapes were dominant (61.1%) or relatively common type (25.9%). 2) The average heights of the labrum were longer (7.4 and 7.0 mm) than at the other sites (4.0 - 6.8 mm). 3) The attachment types with no extra-extended portion (68.5%) and sublabral slits (39.0%) were most commonly observed. It was concluded that there were different types of cut surface and attachment patterns of the acetabular labrum, and these findings had a tendency to be distributed with some labral tears. These anatomical data are believed could be useful in the management of an acetabular labral pathology.

Acetabulum↗

PubMed2003

Morphological study on the rootlets comprising the root of the intermediate nerve.

The number and arising sites of the rootlet comprising the intermediate nerve root were investigated in 100 sides of human brains. The arising sites of the rootlets were the pons halfway between the facial and vestibulocochlear nerves (31.9%), the arising portion of the vestibulocochlear nerve on the pons (28.8%) and the stem of the vestibulocochlear nerve (15.9%). The number of roots varied from one to five, with the most common being one root (58%). The number of rootlets per root also varied from one to five. Most of the roots had one rootlet (63%), while 2% of the roots had five rootlets. The variation of the arising sites of the intermediate nerve rootlets and its clinical significance were also discussed.

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↗

PubMed2002

Expression of MUC1 on corneal endothelium of human.

PURPOSE: To determine the expression of MUC1 in the human corneal endothelium. METHODS: Reverse transcription-polymerase chain reaction (RT-PCR) for MUC1 was performed with total RNA from endothelial cells extracted from the human cornea. In situ hybridization with sense and antisense probes of human MUC1 was performed on the human corneal endothelium, immunoblot analysis using monoclonal antibody specific for human MUC1 (HMFG-1, or VU4H5) was performed on collected human corneal endothelial cells, and immunohistochemistry on the human cornea, using the same antibodies. RESULTS: MUC1 mRNA expression was observed by RT-PCR in the human corneal endothelium, and the nucleotide sequence from the amplified band was matched with known human MUC1. In situ hybridization studies showed the localization of MUC1 mRNA in the human corneal endothelium, and immunoblot assay demonstrated the presence of MUC1 protein (MW > 200 kd). In addition, MUC1 protein was observed on the apical surface of cells and at the superficial layer of the cytoplasm in immunohistochemical studies. CONCLUSIONS: Human corneal endothelial cells produce MUC1, which is known to have protective and lubricative roles.

Adolescent↗