What is the total number of phalanges in the hand?
- The phalanges in a human hand The phalanges are the bones that make up the fingers of the hand and the toes of the foot. There are 56 phalanges in the human body, with fourteen on each hand and foot. Three phalanges are present on each finger and toe, with the exception of the thumb and large toe, which possess only two.
Sep 30, 2021 · Phalanges of hand (Phalanges manus) The phalanges of the hand are the group of small bones that comprise the bony core of the digits (fingers) of the hand.Even though the phalanges are small in size, they are classified as long bones because of their structural characteristics; each phalanx consists of a shaft, distal head and a proximal base.
- Nutrient rami from palmar digital arteries
- 7 min
- Proximal, middle and distal phalanges
Sep 30, 2021 · Interphalangeal joints of the hand (Articulationes interphalangeales manus) The interphalangeal joints of the hand are synovial hinge joints that span between the proximal, middle, and distal phalanges of the hand. In digits 2-5 these joints can be further classified based on which bones are involved.
- Proper palmar digital nerves
- Synovial hinge joint; uniaxial
- Clinical significance
Anatomically, the hand is defined as the region of the upper limb distal to the wrist. The base of the hand contains 8 bones, each known as a carpal bone. The palms of the hands each contain 5 carpal bones. The digits contain the phalanges. The 8 carpal bones are arranged into two rows of four a proximal and a distal row. The proximal row of carpal bones, from the lateral (thumb side) to the medial side is made up of the following bones: The distal row of carpal bones, laterally to medially is made up of the following bones: Lunate (moon-shaped) is a crescent-shaped bone articulating proximally with the radius. The lunate is found centrally in the carpal bones between the scaphoid and triquetrum. The lunate bone is the most frequently dislocated carpal bone. Pisiform (pea-shaped) is a small round sesamoid bone found in the tendon of the flexor carpi ulnaris. The pisiform articulates with the anterior surface of the triquetrum bone, therefore extending anteriorly to form the bump that can be felt at the medial base of the hand. The pisiform bone forms the ulnar border of the carpal tunnel. In contrast to the other carpal bones, the pisiform is not involved in movements of the wrist. Trapezium (table) is a four-sided bone. It articulates with four bones; the 1st and 2nd metacarpals, the scaphoid and the trapezoid. The trapezium has a distinct tubercle on the palmar surface which projects anteriorly. Each palm contains 5 metacarpals bones which articulate proximally with one of the distal carpal bones forming a carpometacarpal joint. The distal end of the metacarpals articulate with the phalanges forming a metacarpophalangeal joint. Each metacarpal is related to a digit and numbered 1-5, beginning with the thumb. Each metacarpal has a head, body and a base. The knuckles are formed by the heads of the metacarpals. There are 14 phalanges which make up the bones of the fingers and thumbs. Similar to the hallux, the Pollux (thumb) only has two phalanges (proximal and distal) whereas the remaining digits have three (proximal, middle and distal). Like the metacarpals, each phalanx has a base, body and distally, a head. The base of each phalanx articulates with the head of the metacarpal.
Approximately 1.8 million people attend Accident and Emergency each year due to hand injuries.1 The functional impact of an injury to the hand is often out of proportion with the extent of the injury itself. As a result, it is important to have a good understanding of the anatomy of the hand.
Scaphoid (boat-shaped) is a boat-shaped bone which articulates proximally with the radius to form the radial border of the carpal tunnel. The scaphoid is the largest bone in the proximal row of carpal bones and is also the most commonly fractured. It often occurs due to a fall on an outstretched hand. As a result of the poor blood supply to the scaphoid, fractures can be slow to heal and avascular necrosis of the proximal fragment of the scaphoid can occur.
The carpal bones form a U-shaped arrangement which is directed anteriorly. The flexor retinaculum spans this U-shaped area to maintain the alignment of the carpal bones. The medial side of the base of the arch is formed by the pisiform and hook of the hamate. The lateral side of the base of the arch is formed by the scaphoid and trapezium. The flexor retinaculum attaches laterally to the trapezium and scaphoid bones and medially to the hamate and pisiform bones. Both the carpal bones and the flexor retinaculum form the carpal tunnel the bones forming the wall and floor and the tendon, the roof. Thickening of the flexor retinaculum can result in carpal tunnel syndrome which results in symptoms secondary to compression of the median nerve.
The most common type of injury to the phalanges are crushing injuries, for example, closing a door on the digit.
1. Murphy GRF, Gardiner MD, Glass GE, Kreis IA, Jain A, Hettiaratchy S. Meta-analysis of antibiotics for simple hand injuries requiring surgery. Br J Surg [Internet]. 2016 Apr;103(5):48792. Available from: http://www.ncbi.nlm.nih.gov/pubmed/26228745
- Carlo Ross
Sep 29, 2021 · The hand is composed of many small bones called carpals, metacarpals and phalanges. The two bones of the lower arm -- the radius and the ulna -- meet at the hand to form the wrist. The Median and Ulnar nerves are the major nerves of the hand, running the length of the arm to transmit electrical impulses to and from the brain to create movement ...
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What is the total number of phalanges in the hand?
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How many phalanges are in a human thumb?
Oct 11, 2021 · Attached to the metacarpal bones are the phalanges, or fingers, of the hand. Each finger is called a phalanx, and each phalanx has three units—the proximal phalanx (St J, the medial phalanx (¡Vj, and the terminal phalanx (Oh The thumb again is the exception, having no medial phalanx. The terminal phalanx has a horny, shell-like substance ...
Oct 10, 2021 · A thumb only has one joint and two phalanges. The thumb is out to the side of the hand and lower than the four fingers. How many phalanges does the thumb have? Phalanges. The 14 bones that are found in the fingers of each hand and also in the toes of each foot. Each finger has 3 phalanges (the distal, middle, and proximal); the thumb only has 2.