Syndactyly

Pranamya Menaria (India; born August 10, 2005) has 25 in total (12 fingers and 13 toes). This is as a result of the condition Polydactyly and Syndactyly.

Source: wiktionary

2012, Donald S. Bae, Chapter 47: Release of Simple Syndactyly, John M. Flynn, Sam W. Wiesel (editors), Operative Techniques in Pediatric Orthopaedics, Wolters Kluwer (Lippincott Williams & Wilkins), page 326, • Syndactyly refers to the failure of separation between adjacent digits, resulting in "webbed" fingers. • Congenital syndactyly is classified according to the extent of digital involvement and the character of the conjoined tissue. • Complete syndactyly extends to the digital tips (FIG 1A), whereas incomplete syndactyly ends proximal to the fingertips (FIG 1B). • Simple syndactyly refers to digits connected only by skin and soft tissue. Complex syndactyly denotes bony fusions between adjacent phalanges. • Complicated syndactyly refers to the interposition of accessory phalanges or abnormal bones between digits.

Source: wiktionary

Fig. 2.2f.1 Complete syndactyly. Schematic (A) shows syndactyly of hand excluding the thumb. The thumb may be included in the syndactyly, as evident in the left hand of the patient with Apert syndrome (B). The great toe is usually included in syndactyly of the foot.

Source: wiktionary

Complex syndactylies are more often part of a syndrome such as Apert, Carpenter, or Saethre-Chotzen syndrome.

Source: wiktionary