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In the foot, the distal phalanges are flat on their dorsal surface. It is largest proximally and tapers to the distal end. The proximal part of the phalanx presents a broad base for articulation with the middle phalanx, and an expanded distal extremity for the support of the nail and end of the toe. [10]: 6b. 3.
The fourteen phalanges make up the fingers and thumb, and are numbered I-V (thumb to little finger) when the hand is viewed from an anatomical position (palm up). The four fingers each consist of three phalanx bones: proximal, middle, and distal. The thumb only consists of a proximal and distal phalanx. [11]
Flexor digitorum profundus lies deep to the superficialis, but it attaches more distally. Therefore, profundus's tendons go through the tendons of superficialis, and end up attaching to the distal phalanx. For this reason profundus is also called the perforating muscle. [2] The lumbricals of the hand arise from the radial side of its tendons. [2]
Medial cuneiform bone (2) Intermediate cuneiform bone (2) Lateral cuneiform bone (2) Cuboid bone (2) Metatarsals (10) Phalanges of the foot (28 bones in total, 14 per foot) Proximal phalanges (10) Intermediate phalanges (8) Distal phalanges (10)
The fingers have two long flexors, located on the underside of the forearm. They insert by tendons to the phalanges of the fingers. The deep flexor attaches to the distal phalanx, and the superficial flexor attaches to the middle phalanx. The flexors allow for the actual bending of the fingers.
The rest of the toes each have three phalanx bones (proximal, middle, and distal phalanges), so they have two interphalangeal joints: the proximal interphalangeal joint between the proximal and middle phalanges (abbreviated "PIP joint") and the distal interphalangeal joint between the middle and distal phalanges (abbreviated "DIP joint").
Medial side of the base of the proximal phalanx of the thumb and the ulnar sesamoid: Ulnar nerve (C8-T1) Adducts at the CMC joint and opposition First dorsal interosseous: Medial side of first metacarpal bone: Lateral side of second proximal phalanx: Ulnar nerve (C8-T1) Flexor pollicis brevis: Trapezium, flexor retinaculum
medial side of base of proximal phalanx of first digit medial plantar nerve: abducts hallux: adductor hallucis: 2 1 flexor digitorum brevis: Lower limb, plantar, first layer, left/right medial process of calcaneus, plantar aponeurosis, intermuscular septa: middle phalanges of digits 2–5 medial plantar nerve: flexes lateral four toes