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Abstract：
Lumbrical muscles originate in the palm from the 4 tendons of the flexor digitorum profundus and course distally along the radial side of the corresponding metacarpophalangeal joints, in front of the deep transverse metacarpal ligament. The first and second lumbrical muscles are typically innervated by the median nerve, and third and fourth by the ulnar nerve. A plethora of lumbrical muscle variants has been described, ranging from muscles\' absence to reduction in their number or presence of accessory slips. The current cadaveric study highlights typical and variable neural supply of lumbrical muscles.
Eight (3 right and 5 left) fresh frozen cadaveric hands of 3 males and 5 females of unknown age were dissected. From the palmar wrist crease, the median and ulnar nerve followed distally to their terminal branches. The ulnar nerve deep branch was dissected and lumbrical muscle innervation patterns were noted.
The frequency of typical innervations of lumbrical muscles is confirmed. The second lumbrical nerve had a double composition from both the median and ulnar nerves, in 12.5% of the hands. The thickest branch (1.38 mm) originated from the ulnar nerve and supplied the third lumbrical muscle, and the thinnest one (0.67 mm) from the ulnar nerve and supplied the fourth lumbrical muscle. In 54.5%, lumbrical nerve bifurcation was identified.
The complex innervation pattern and the peculiar anatomy of branching to different thirds of the muscle bellies are pointed out. These findings are important in dealing with complex and deep injuries in the palmar region, including transmetacarpal amputations.
Eight (3 right and 5 left) fresh frozen cadaveric hands of 3 males and 5 females of unknown age were dissected. From the palmar wrist crease, the median and ulnar nerve followed distally to their terminal branches. The ulnar nerve deep branch was dissected and lumbrical muscle innervation patterns were noted.
The frequency of typical innervations of lumbrical muscles is confirmed. The second lumbrical nerve had a double composition from both the median and ulnar nerves, in 12.5% of the hands. The thickest branch (1.38 mm) originated from the ulnar nerve and supplied the third lumbrical muscle, and the thinnest one (0.67 mm) from the ulnar nerve and supplied the fourth lumbrical muscle. In 54.5%, lumbrical nerve bifurcation was identified.
The complex innervation pattern and the peculiar anatomy of branching to different thirds of the muscle bellies are pointed out. These findings are important in dealing with complex and deep injuries in the palmar region, including transmetacarpal amputations.
摘要：
腰椎肌肉起源于手掌中的4个肌腱，并沿着相应的掌指关节的radial侧向远端行进，在深掌骨横韧带前面。第一和第二腔肌通常由正中神经支配，第三和第四是尺神经。已经描述了大量的腰肌肉变异，从缺乏肌肉到减少肌肉数量或存在辅助滑片。当前的尸体研究强调了典型的和可变的神经供应。
解剖了年龄不详的3名男性和5名女性的8只（右3只和左5只）新鲜冷冻尸体手。从手掌手腕折痕，正中神经和尺神经的末端分支。解剖尺神经深支，并注意到腰椎肌神经支配模式。
确认了典型的腰肌神经支配的频率。第二个腰神经具有正中神经和尺神经的双重组成，在12.5%的手中。最粗的分支（1.38毫米）起源于尺神经，并提供第三腰肌肉，和最薄的一个（0.67毫米）尺神经，并提供了第四盘肌。在54.5%中，确定了腰神经分叉。
指出了复杂的神经支配模式和分支到不同三分之一的肌肉腹部的特殊解剖结构。这些发现对于处理手掌区域的复杂和深度损伤非常重要，包括掌骨截肢.
解剖了年龄不详的3名男性和5名女性的8只（右3只和左5只）新鲜冷冻尸体手。从手掌手腕折痕，正中神经和尺神经的末端分支。解剖尺神经深支，并注意到腰椎肌神经支配模式。
确认了典型的腰肌神经支配的频率。第二个腰神经具有正中神经和尺神经的双重组成，在12.5%的手中。最粗的分支（1.38毫米）起源于尺神经，并提供第三腰肌肉，和最薄的一个（0.67毫米）尺神经，并提供了第四盘肌。在54.5%中，确定了腰神经分叉。
指出了复杂的神经支配模式和分支到不同三分之一的肌肉腹部的特殊解剖结构。这些发现对于处理手掌区域的复杂和深度损伤非常重要，包括掌骨截肢.
