Assist lumbricals in extending interphalangeal joints while flexing metatarsal phalangeal joints : NERVE Origin: Dorsal 1 – 4: Adjacent sides of two metacarpals (bipennate muscles) Insertion: The first muscle connects to the medial side of the proximal phalanx of the second digit. The first digit and the fifth digit have their own abductor muscles in the thenar and hypothenar eminence and so do not have interossei musculature [2]. [1], The medial side of the proximal end of the first metacarpal and lateral side of the second metacarpal. https://www.youtube.com/watch?v=cn1Vp9FawKI, https://www.physio-pedia.com/index.php?title=Dorsal_Interossei_of_the_Hand&oldid=259243, Lateral side of the base of the second proximal phalanx and the extensor expansion (Extensor Hood), Medial side of the second metacarpal and lateral side of the third metacarpal, Lateral side of the base of the third proximal phalanx and the extensor expansion, Medial side of the third metacarpal and lateral side of the fourth metacarpal, Medial side of the base of the third proximal phalanx and the extensor expansion, Medial side of the fourth metacarpal and lateral side of the fifth metacarpal, Medial side of the base of the fourth proximal phalanx and the extensor expansion. The position of the insertion site is dependent on which digit is involved. Each muscle is bipennate in shape and extends from the proximal ends of adjacent metacarpals to the proximal phalanx and dorsal digital expansion of the appropriate finger. Dorsal Interossei Muscles : Origin, Insertion, Action & Nerve Supply. If you believe that this Physiopedia article is the primary source for the information you are refering to, you can use the button below to access a related citation statement. London: Butterworth Heinemann Elsevier, 2006. The first dorsal interosseous muscle can be tested by placing the patient's palm flat on a table and asking the patient to abduct his/her index finger against the examiner's resistance. Palastanga N, Field D, Soames R. Anatomy and human movement. The Dorsal Interossei muscles of the hand are all supplied by the deep branch of the ulnar nerve (C8, T1) [1]. Origin: Originates from the sides of metatarsals one to five. The dorsal interossei muscles are muscles that abduct the second, third and fourth digits. Drake RL, Vogl W, Mitchell AWM. The 1st dorsal interosseous muscle receives vascular supply from the first dorsal metacarpal branch of the radial artery. Origin: Nerve Supply: Ulnar nerve. Physiopedia articles are best used to find the original sources of information (see the references list at the bottom of the article). The dorsal interossei are four muscles in the back of the hand that performs to abduct the index, middle, and ring fingers and assists in flexion at the metacarpophalangeal joints and extension at the interphalangeal joints of the middle, index and ring fingers. The innervation of all dorsal interossei is carried by the deep branch of ulnar nerve, derived from nerve roots C8 and T1. In most cases Physiopedia articles are a secondary source and so should not be used as references. Dorsal 1 – 4: Abduct digits from axial line and act with lumbricals to flex metacarpophalangeal joints and extend interphalangeal joints. The medial plantar nerve from the tibial nerve provides sensory innervation to the skin of the medial side of the sole, the skin of the medial three and a half toes, and the nail beds of these toes. That is usually the journal article where the information was first stated. All rights reserved. Dorsal interossei muscles of the hand- Human anatomy. Insertion: Dorsal 1 – 4: Extensor expansions and bases of proximal phalanges of digits 2 – 4, Nerve Supply of the Dorsal Interossei  Muscles Sign up to receive the latest Physiopedia news, The content on or accessible through Physiopedia is for informational purposes only. How Many Ounces in a Gallon ? Blood supply. Function of the Dorsal Interossei  Muscles Available from: I give my consent to Physiopedia to be in touch with me via email using the information I have provided in this form for the purpose of news, updates and marketing. Attachment of the Dorsal Interossei  Muscles Structure and function. There are four dorsal interossei in each hand. 1173185. – Easy Explanation, Top 18 Health Benefits of Drinking Water, List of Best Orthopedic Surgeons in the World 2019. When refering to evidence in academic writing, you should always try to reference the primary (original) source. Each muscle is bipennate in shape and extends from the proximal ends of adjacent metacarpals to the proximal phalanx and dorsal digital expansion of the appropriate finger. Each arises from two metatarsals. Read more, © Physiopedia 2020 | Physiopedia is a registered charity in the UK, no. Deep branch of ulnar nerve  (C8 and T1), Blood Supply of the Dorsal Interossei  Muscles In the hand there are four dorsal Interossei which lie superficially, inbetween the metacarpals on the dorsum of the hand. Dorsal interossei: Dorsal interossei of the foot are four muscles situated between the metatarsal bones. The position of the insertion site is dependent on which digit is involved.