Accessory muscles passing through Guyon's canal are common; the most common anomalous muscle at Guyon's canal is the accessory abductor digiti minimi muscle (AADM). The aim of this study was to demonstrate and describe the gross anatomy of an anatomic variant of the AADM relative to the surrounding structures. The AADM was found in the left forearm and hand of a 61-year-old male cadaver during dissection in a gross anatomy course. It was observed by focusing on the shape, the course, and its relationship with the surrounding structures. The AADM originated as muscle fibers from the antebrachial fascia. It coursed downward in the distal forearm and crossed the ulnar nerve and artery obliquely at Guyon's canal. The AADM narrowed and became a long tendon in the hypothenar region. The abductor digiti minimi muscle was partly attached to the tendon of the AADM, running along the tendon. The tendon of the AADM inserted into the ulnar side of head of the fifth metacarpal bone. The AADM was innervated by several twigs from the ulnar nerve. We reported herein another variant of the AADM at Guyon's canal, which may be helpful to surgeons performing diagnoses and surgical procedures.
Anatomic Variation ; Arteries ; Cadaver ; Fascia ; Forearm ; Hand ; Head ; Humans ; Male ; Middle Aged ; Muscles ; Running ; Tendons ; Ulnar Nerve

Malignant acanthosis nigricans is very rare disease. The disease is related with internal malignancy, especially gastrointestinal tract malignancy. Reported occurrence rate of malignant acanthosis nigricans associated internal malignancies are 64% of stomach adenocarcinoma, 27% of other organs of abdomen (liver, gall bladder, small intestine, rectum, uterus, ovary), 9% of non-abdominal organs(breast, lung). We report a case of malignant acanthosis nigricans associated with stomach adenocarcinoma from 20-year-old female and discuss review of literature on a acanthosis nigricans briefly.
Female ; Humans ; Adenocarcinoma

The aim of the present study was to describe a variation of the anomalous nasi muscle in relation to the surrounding structures. The anomalous nasi muscle was found in the left face of a 40-year-old female during dissection. The anomalous nasi muscle lay on the lateral side of the nose, and it originated from the frontal process of the maxilla. The origin of the anomalous nasi muscle was located medial to the middle part of the levator labii superioris alaeque nasi muscle. It ascended superomedially to blend with the deep and lateral fibers of the superficial layer of the procerus below the level of the medial palpebral ligament. The length and width of the anomalous nasi muscle were 11.9 mm and 2.8 mm, respectively. This report demonstrated a variation of the anomalous nasi muscle, which will be helpful for understating the nasal movements and nasal wrinkles.
Adult ; Female ; Humans ; Ligaments ; Maxilla ; Nose

This report describes a variation of the tendinous slip of the flexor digitorum longus (FDL) for the great toe. In addition, compositions of the long flexor tendons for all five toes were examined. The tendons of the FDL in the foot were investigated in 66 specimens of embalmed Korean adult cadavers. The tendons of the flexor hallucis longus (FHL) and the FDL with the lumbrical muscles were cut at the calcaneus and the metatarsophalangeal joints and were removed en bloc specifically to observe the FDL and the FHL tendons of the great toe. The tendinous slip of the FDL for the great toe was found bilaterally in the foot of a 52-year-old male. Its prevalence was two of 66 specimens (3.0%). The tendinous slip of the FDL for the great toe passed forward the great toe, and it constituted the superficial portion of the long flexor tendon for the great toe. The tendon of the FHL passed forward to constitute the deep portion of the long flexor tendon for the great toe. Thus, both the tendinous slip of the FDL and the tendon of the FHL composed the long flexor tendon for the great toe. The tendinous slip of the FDL and the tendon of the FHL for the great toe were similar in thickness; thus, each tendinous slip of the FDL and the tendon of the FHL were approximately one-half of the long flexor tendon for the great toe in thickness. The present study demonstrated an anatomical variation of the interconnection between the FHL and the FDL tendons, which will be useful for various surgeries and biomechanical research.
Adult ; Anatomic Variation* ; Cadaver ; Calcaneus ; Foot ; Humans ; Male ; Metatarsophalangeal Joint ; Middle Aged ; Muscles ; Prevalence ; Tendons ; Toes*

The aim of this study was to classify morphological patterns of the lumbrical muscles and their anatomical variations in the hands. The lumbricals in the hand were investigated in 70 specimens of 45 embalmed Korean adult cadavers. The shapes of the lumbrical muscles were observed in 70 specimens and the distances from the distal border of the flexor retinaculum to the origins of the lumbricals were measured using digital calipers in 52 specimens. The lumbrical muscles were classified into 3 types based on their shapes, and also into 10 types based on their insertion sites. The average distances from the distal border of the flexor retinaculum to the origins of the first, second, third, and fourth lumbricals were +1.8 mm, - 1.4 mm, +5.1 mm, and +11.2 mm, respectively. The results of this study could be useful information for better understanding the function of the lumbrical muscles and for various types of diagnoses and surgery involving the hands.
Adult ; Cadaver ; Diagnosis ; Hand* ; Humans ; Muscles*

Acral lentiginous melanoma is a rare variant of malignant melanoma and is characterized by a lentiginous (radial) growth phase that evolves over months or years to a dermal (vertical) invasive stage. Clinical and pathological features were reviewed in 3 cases of acral lentiginous melanoma of the soles. The first case was a 59-year-old female. On gross examination, there was a black, nodular, round, and ulcerated mass, 1.5 x 1.5 cm, on the posterior portion of the left sole. This mass was accompanied by peripheral pigmented macules. Histologically, the macular lesion revealed the pattern of a lentiginous growth phase, with a diffuse hyperplasia of atypical melamocytes in the basal layer of the epidermis. In the vertical growth component, atypical melanocytes (predominantly spindle cell) infiltrated the dermis, showing level 3 invasion. The second case was a 47-year-old male. On gross examination, there was a dark brown to black, nodular, hemorrhagic and ulcerated mass, 7x7 cm, on the middle portion of the right sole. This mass grew radially into neighboring tissue. Histologically, the radial growth component revealed atypical melanocytes which were distributed in the basal portion of epidermis. In the vertical growth component, atypical melanocytes (spindle, round, or polygonal cells) infiltrated the dermis, showing level 4 invasion. The third case was a 87-year-old female. There was a formation of satellite pigmented macules, up to 2x0.5 cm, on the right sole. The color of macules was usually not uniform but was likely to be scattered radially, being grayish brown, bluish black, or black. Histologically, the peripheral, macular, hyperpigmented lesion revaled the pattern of a lentiginous growth phase. In the vertical growth component, atypical melanocytes (predominently polygonal cells) infiltrated the dermis, showing level 13 invasion.
Female ; Humans

This case report describes an unusual communicating branch from radial to ulnar nerves in the axilla region on the right side of the Korean cadaver of a 59-year-old male. The brachial plexus containing the communicating branch were extracted en bloc. The extracted specimens were immersed in Guanidine-HCl (0.2 M) for two weeks and then treated several times with an ultrasonic cleaner for an hour to soften the connective tissue around the nerve bundles. The spinal root origins of this communicating branch were found to be largely C7 and some C8. Unexpectedly, the branches of the ulnar nerve innervated the medial two-third of the medial head of the triceps brachii muscle on the right side in the same cadaver. Numbers of nerve fibers of the communicating branch and the main distributing branch of the ulnar nerve to the triceps brachii muscle were 523 and 525, respectively. This result implies that nerve fibers moving from the radial to the ulnar nerves may innervate the original distributing territories of the radial nerve. Another possibility is that a part of radial muscular branch to the triceps beachii muscle may be fused to the ulnar nerve in their distributing territories.
Axilla ; Brachial Plexus ; Cadaver ; Connective Tissue ; Head ; Muscles ; Nerve Fibers ; Radial Nerve ; Spinal Nerve Roots ; Ulnar Nerve ; Ultrasonics

This study was carried out to evaluate the quantity of the nerve fiber of the terminal branches of the typical brachial plexus in the 6 sides of the Korean adults. The dorsal scapular nerve, which is derived from ramus of the brachial plexus, was comprised of C5 and participating nerve fiber was 355+/-180. The long thoracic nerve was composed of C5, C6 and C7, and was mainly originated from C6, and participating nerve fiber was 743+/-346. The nerves, which are branched out from trunk, nerve to subclavius muscle was composed of C5 and participating quantity was 242+/-71. The suprascapular nerve was comprised of C5 and C6, and the nerve fiber was mainly derived from C5 (1,942+/-505). The nerve, which is originated from proximal portion of the cord, the lateral pectoral nerve was constituted of C5, C6 and C7. The main component was C7 as the 2,917+/-785 nerve fiber. The medial pectoral nerve was made with C8 and T1. The main component was C8 as the 964+/-430 nerve fiber. The upper subscapular nerve was derived from C5 and C6. The nerve fiber was 1,179+/-92 in C5, mainly participated. The Lower subscapular nerve was constituted of C5, C6 and C7. C6 was the main component and contributing nerve fiber was 1,070+/-390 in C6, principal component. The thoracodorsal nerve was formed by C6, C7 and C8. The chief component was C7, contributed of 2,335+/-324. The nerves, which are came out from the distal portion of the cord, musculocutaneous nerve was derived from the C5, C6 and C7. The C6 was principal component, and was joined with 4,009+/-1,883. The median nerve was contributed from C5 to T1. The chief component was C7 added with 9,651+/-2,663. The ulnar nerve was composed of C7, C8 and T1. The C8 was the main component comprised of 10,075+/-1,473. The medial brachial and antebrachial cutaneous nerves was constituted of C8 and T1. In the both nerves, the main component was T1 participated with 1,752+/-390, 3,080+/-1,140 respectively. The radial nerve was composed of C5 to T1. The C7 was principal component added with 7,958+/-2,333. The axillary nerve was made up C5 and C6. In the nerve, the both spinal segments were similarly participated to the nerve. This results could be applied for the injuries and neurotization procedure of the terminal nerves of the brachial plexus.
Brachial Plexus ; Median Nerve ; Muscles ; Musculocutaneous Nerve ; Nerve Fibers ; Nerve Transfer ; Porphyrins ; Radial Nerve ; Spinal Nerves ; Thoracic Nerves ; Ulnar Nerve

The present case report describes an unusual variant of a missing medial tarsal artery (MTA) being replaced by the anterior medial malleolar artery (AMMA). The dorsalis pedis artery (DPA) did not give off any branches to the medial foot. The DPA coursed downward in the foot along with the superficial fibular nerve on the foot dorsum at the lateral side of the first metatarsal bone before entering the sole. In the medial malleolus, the AMMA arose from the anterior tibial artery and then ramified several branches, one of which descended to the medial talus. Thus, the possibility of a missing MTA being replaced by the AMMA should be considered by surgeons and radiologists when various surgeries are performed in the medial tarsal area.

This case report describes a variation in the course of the accessory meningeal artery relative to the mandibular nerve in the infratemporal fossa. An accessory meningeal artery running superficially to the posterior division of mandibular nerve was found bilaterally in the cadaver of a 95-year-old male. It was observed by a topographic examination followed by a detailed dissection. The accessory meningeal artery arose from the middle meningeal artery. It then passed upward and coursed superficial to the posterior division of the mandibular nerve before its division into the lingual and inferior alveolar nerves. The accessory meningeal artery subsequently ran deep and rostral to the anterior and posterior divisions of the mandibular nerve, respectively, before entering the foramen ovale. The variation in the course of the accessory meningeal artery described herein should be helpful for surgeons in approaches to the foramen ovale region and infratemporal fossa.
Cadaver ; Foramen Ovale ; Humans ; Male ; Mandibular Nerve ; Meningeal Arteries ; Running