Carpal bone – The carpal bones, the ossa carpi, are arranged in two rows. The upper or proximal row adjoins the distal forearm bones and forms an elliptical articular surface convex to the forearm; the second row, the lower or distal… Atlas of Human Anatomy
Bones of the hand Latin
Represents a collection of 8 short cheekbones - the...
Ossa carpi
, which are arranged in two rows of 4 bones each.
The row of carpal bones closest to the forearm consists of the following bones, counting from the thumb
Navicular, os scaphoid, semilunate, os lunate, triquetrum, os triquetrum, and peabone, os pisiforme.
The first three bones fuse to form an elliptical articular surface that is convex towards the forearm and is articulated to the distal end of the radius bone.
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The pea bone is not involved in this joint because it is connected separately to the triangular bone. The pea bone is a sesamoid bone that is attached to the tendon of the m. flexor carpi ulnaris.
The carpal row consists of the bones:
Trapezius, Os trapezius.
,
The carpal row consists of the bones: Os trapezoidum, Os trapezoidum, Os trapezoidum, Os capitate, Os capitation, and hook, Os hamatum.
The names of the bones reflect their shape. The surfaces of each bone have articular surfaces that serve to connect with neighboring bones.
In addition, on the palm of some carpal bones there are cusps for attaching muscles and ligaments, namely on the navicular bone - that Tuberculum ossis scapholdei
on the side
on the trapezoid bone – Tuberculum ossis trapezii
and on the hook leg –
Hookbone – hamulus ossis hamati
from which his name derives.
Together, the carpal bones form a kind of arch that is convex on the dorsal side and concavely grooved on the palmar side. On the radial side is the sulcus carpi, Sulcus carpi
The sulcus carpi is limited on the radial side
On the radial side, the sulcus carpi is bordered by an elevation, the eminentia carpi radialis.
On the ulnar side it is bordered by another eminentia carpi radialis
on the ulnar side by another projection, the eminentia carpi ulnaris
consisting of
hamulus ossis hamati and os pisiforme
.
Bones and Joints of the Hand [Edit | Edit ].
The skeleton of the hand consists of the bones of the wrist, the metacarpals and the bones of the fingers (phalanges). The carpus consists of eight short, spongy bones arranged in two rows of four:
The lower ends of the radial and ulnar bones are connected to the carpal bones to form a compound carpal joint that can rotate about all three axes.
The bones of the lower row are connected to the bones of the upper row, the lower row to the metacarpals and to each other, forming rigid joints.
The next row of bones in the hand is formed by the metacarpal bones. There are five bones, depending on the number of fingers. Their bases are connected to the carpal bones. The phalanges, like the metacarpals, are short tubular bones. Each finger consists of three phalanges: the main phalanx (proximal), the middle phalanx and the terminal phalanx (distal). An exception is the thumb, which only consists of two phalanges - the basal phalanx and the fingernail phalanx. There are movable joints between the metacarpal bone and the phalanges of each finger.
The hand consists of three parts: the wrist, the metacarpal, and the fingers.
Carpal bones[edit]
The proximal row consists of the following bones that run from the thumb toward the fifth finger: navicular, semilunate, triangular, and pea bones.
The distal row also consists of four bones: polygonal, trapezoidal, cephalic and hook-shaped, which faces the palm with its hook.
On the rook (navicular bone) through the moon (semilunar bone) three (triangular bones) ate the pea (pea bone), and removed the hook (hook bone) of the head fish (skull bone), and then deposited the trapezium (trapezoidal bone) trapezium (trapezium).
The proximal row of carpal bones forms an articular surface that is convex to the radius bone. The distal row is connected to the proximal row by an irregularly shaped joint.
The carpal bones lie in different levels and form a groove (sulcus carpalis) on the palmar surface and a ridge on the dorsal surface. The tendons of the finger flexor muscles are located in the carpal sulcus. Its inner edge is bordered by the pea bone and the hook of the hook bone, which are easily palpable; the outer edge consists of two bones, the navicular and the trapezium.
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