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In human anatomy, the dorsal interossei (DI) are four muscles in the back of the hand that act to abduct (spread) the index, middle, and ring fingers away from the hand's midline (ray of middle finger) and assist in flexion at the metacarpophalangeal joints and extension at the interphalangeal joints of the index, middle and ring fingers. [1]
A hand is a prehensile, multi-fingered appendage located at the end of the forearm or forelimb of primates such as humans, chimpanzees, monkeys, and lemurs.A few other vertebrates such as the koala (which has two opposable thumbs on each "hand" and fingerprints extremely similar to human fingerprints) are often described as having "hands" instead of paws on their front limbs.
Blood vessel Dorsal venous network of hand The veins on the dorsum of the hand. (Dorsal venous network labeled at center right.) Details Drains from Hand Source Dorsal metacarpal veins Drains to Cephalic vein, basilic vein Identifiers Latin rete venosum dorsale manus TA98 A12.3.08.023 TA2 4967 FMA 67977 Anatomical terminology [edit on Wikidata] The dorsal venous network of the hand is a venous ...
These two terms, used in anatomy and embryology, describe something at the back (dorsal) or front/belly (ventral) of an organism. [2] The dorsal (from Latin dorsum 'back') surface of an organism refers to the back, or upper side, of an organism. If talking about the skull, the dorsal side is the top. [38]
The anatomical snuff box or snuffbox or foveola radialis is a triangular deepening on the radial, dorsal aspect of the hand—at the level of the carpal bones, specifically, the scaphoid and trapezium bones forming the floor. The name originates from the use of this surface for placing and then sniffing powdered tobacco, or "snuff."
The dorsal surface presents in its distal two-thirds a smooth, triangular, flattened area which is covered in by the tendons of the extensor muscles. This surface is bounded by two lines, which commence in small tubercles situated on either side of the digital extremity, and, passing upward, converge and meet some distance above the center of ...
The proximal surface of the lunate bone is smooth and convex, articulating with the radius. The lateral surface is flat and narrow, with a crescentic facet for articulation with the scaphoid bone. The medial surface possesses a smooth and quadrilateral facet for articulation with the triquetral bone. The palmar surface is rough, as is the ...
Interosseous muscles of the hand; Details; Origin: Dorsal: metacarpal bones 1 to 5. Palmar: metacarpal bones of digits 2, 4, 5: Insertion: Dorsal: bases of proximal phalanges and extensor expansions of digits 2 to 4. Palmar: base of proximal phalanx and extensor expansion of the same digit from which it originated. Nerve: deep branch of the ...
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