Abstract
The lumbrical muscles of hand, by producing flexion at metacarpo phalangeal (MCP) joints & extension at interphalangeal joints help in writing, stitching and other forms of precision work. Variations in length, breadth or tendon length may cause carpal tunnel syndrome. Variations are also seen between parameters of both sexes and right and left hands of the same individuals. Their hypertrophy may cause compression of radial & ulnar collateral arteries leading to chronic subischemia. Also these may cause surgical complications in hand surgeries. So this study has been undertaken to know about morphometry and comparison between parameters of lumbrical muscles in both sexes of human hands. Keywords: Lumbricals, Human Hands, Morphometry, Sexual Dimorphism.
Highlights
Pre eminent position that the man enjoys amongst the animals is due to functional specialization of the human hand that can perform very intricate and highly skilled precise movements
The lumbrical muscles were followed to their tendons which pass with the proper digital vessels and nerves to the lateral side of the base of each finger and later, the tendons of each of the lumbrical muscles were traced up to their insertion
Mutalik [2011] 4 has noted that the length of 1st lumbrical of left hand is more than that of right hand. (P value 0.049)
Summary
Pre eminent position that the man enjoys amongst the animals is due to functional specialization of the human hand that can perform very intricate and highly skilled precise movements. Human hand possesses three basic grips- Power, Hook & Precision. Power and Hook grips are primitive while Precision grip is characteristic of human. Finger tips & thumb are used to hold finer objects like pen, pencil or needle for skillful manipulation. This grip enriches human culture in arts and crafts. This is contributed by a high degree of neuromuscular co-ordination & a larger cortical representation of the hand in sensory & motor cortex in human brain. Evolution of grasping ability of human being contributed by lumbrical muscles is attributed to the ecological context of such skills in the frogs. Evolution of grasping ability of human being contributed by lumbrical muscles is attributed to the ecological context of such skills in the frogs. 1 human hand is revolution in evolution
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