Then Common Vein
Copyright 2010
Definition
The dorsal interossei of the musculoskeletal system is characterized by being four muscles.
It is part of the 4th layer of plantar muscles of the lower leg and consists of skeletal muscle fibers.
Its unique structural features include that they are double pinnate fibers located between metatarsal bones.
The origins are the adjacent sides of the 1st through 5th metatarsals.
The insertions are the medial side of the 2nd digit for the 1st dorsal interossei, and on the lateral sides of the 2nd through the 4th digits for the 2nd through the 4th dorsal interossei.
The innervation is from the lateral plantar nerve.
The dorsal interossei muscles as well as all other bones, muscles, and ligaments of the body are derived of mesodermal origin in embryo.
The function of the dorsal interossei is to abduct the 2nd through the 4th toes and flex the metatarsophalangeal joints.
There are no common diseases.
Commonly used diagnostic procedures include clinical history, physical exam, and MRI.
References
Lieberman J (ed), AAOS Comprehensive Orthopaedic Review, American Academy of Orthopaedic Surgeons, 2008.
Moore K, Dalley A (eds), Clinically Oriented Anatomy (5th edition), Lippincott Williams & Wilkins, Philadelphia, PA, 2006.
Wheeless’ Textbook of Orthopaedics: Dorsal Interossei (http://www.wheelessonline.com/ortho/dorsal_interossei_of_feet)