A comparative study of the lumbrical muscles in the hand

Ikebuchi, Yoshifumi

doi:10.4044/joma1947.104.3-4_365

Cited by 1 publication

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“…Thus, our studies show that the insertion-patterns of the lumbrical muscles are quite similar in the human hand and foot. We have also studied the hands or forepaws of the kangaroo, dog, cat and monkey, and suggested that the lumbrical muscles in the hands are originally bipennate muscles, which are inserted by two (medial and lateral) tails into the bases of the proximal phalanges of the contiguous fingers (Ikebuchi, 1992). Namely, we have indicated that in the phylogenetic development, the lumbrical muscles lose their lateral tails (or solely remain their medial tails) and also move (or transfer) their insertions from the proximal phalanges to the dorsal aponeuroses.…”

Section: Discussionmentioning

confidence: 99%

Insertions of the Lumbrical and Interosseous Muscles in the Human Foot

Oukouchi

Murakami

Kikuta

1992

Okajimas Folia Anatomica Japonica

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Summary: The lumbrical and interosseous muscles in twenty-five feet of Japanese adult cadavers were dissected. The lumbrical muscles mainly continued into the dorsal aponeuroses or the terminal tendons of the extensor digitorum longus muscle, though they occassionally issued some accessory and slender tendons inserting into the bases of the proximal phalanges. Rarely, the lumbrical muscle showed an atavistic anomaly. In this anomaly, the lumbrical muscle was divided into two tails which continued into the bases of the proximal phalanges of the contiguous toes. The plantar and dorsal interosseous muscles were mainly attached to the bases of the proximal phalanges. Frequently, the plantar and dorsal interosseous muscles issued some accessory and small tendons continuing into the dorsal aponeuroses.This fact suggests that the plantar and dorsal interosseous muscles in the foot, like the palmar and dorsal interosseous muscles in the hand, are composite muscles derived from the flexor brevis, contrahens and other muscles.The lumbrical muscles of the human foot are generally regarded as being inserted into the proximal phalanges (Henle, 1871; Frohse and Frãnkel, 1913; Paturet, 1951;Mortenson and Pettersen, 1966;Gardner, Gray and O'Rahilly, 1971; Tillman and TOndury, 1987). However, our recent dissection of Japanese feet has revealed that the lumbrical muscles mainly end in the dorsal aponeuroses. These are reported in the present paper. The insertions of the interosseous muscles are also described and discussed in relation to their phylogenetic compositions. Materials and MethodsTwenty-five feet of Japanese adult cadavers of both sexes, which had been fixed with 10% formalin by vascular perfusion and dehydrated with 60-70% ethanol, were dissected with sharpened forceps under a dissection light microscope. ResultsThere were four lumbrical, four dorsal interosseous and three plantar interosseous muscles in the human foot (Fig. 1, 2, 3). These muscles were numbered from the medial side of the foot (Figs. 1, 2, 3). No morphological difference of the lumbrical, dorsal interosseous and plantar interosseous muscles was observed between the male and female cadavers and also between the right and left feet.The dorsal aponeurosis of the toe consisted of the tendons of the extensor digitorum longus and brevis muscles and the outer and inner tendinous membranes arising, together with the deep plantar metatarsal ligaments, from the plantar aspect of the neck of the metatarsal bone (Figs. 4, 5, 6). The inner tendinous membranes ran around the neck of the metatarsal bone, and enclosed the tendons of the extensor digitorum longus and brevis muscles at a level between the neck of the metatarsal bone and the head of the proximal phalanx (Fig. 5). Thus, the inner tendons extended bilaterally along the proximal phalanx (wing tendons) (Figs. 4, 6). The outer tendinous membrane was thick and band-like, and firmly surrounded the plantar and dorsal interosseous muscles and the enclosed tendons of the extensor muscles (see above) (Figs. 5, ...

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Section: Discussionmentioning

confidence: 99%