radiology anatomy RADT dixie state radiography x ray
Radiographic Positioning and Related Anatomy (Chapter 5)
The bones in the upper limb can be divided into how many groups and what are they?
4- (1) hand and wrist, (2) forearm, (3) arm (humerus), and (4) shoulder girdle
How many bones are in the hand and wrist, and how are they divided?
1. Phalanges (fingers and thumb) = 14
2. Metacarpels (palm) = 5
3. Carpels (wrist) = 8
The most distal bones of the hand, which comprise the digits. (14 bones/hand)
Second group of bones in the hand, these bones make up the palm of each hand. (5 bones/hand)
The third group of bones in the hand, consists of the bones in the wrist. (8 bones/hand)
Singular of phalanges-
Numbered 1-5, (Thumb-->Pinkie)
Digits 2-5 are each composed of three phalanges. (distal, middle, & proximal)
Digit 1 (thumb) composed of only 2. (distal & proximal)
Each phalanx consists of 3 parts. (head, body, & base)
Joints of the Hand
Radius (lateral/thumb side) & Ulna (medial side)
Small conical projections, located at the extreme distal ends of both the radius and the ulna.
A small depression on the medial aspect of the distal radius. The Head of the ulna fits into the UN to form the distal radioulnar joint.
Beaklike process of the proximal ulna. Can be palpated easily on the posterior aspect of the elbow joint.
Beaklike process of the proximal ulna. Not the olecranon.
The medial margin of the coronoid process opposite the radial notch (lateral).
The large concave depression, or notch, that articulates with the distal humerus. (semilunar notch)
The small, shallow depression located on the lateral aspect of the proximal ulna.
The expanded distal end of the humerus. The articular portion is divided 2 parts: the trochlea (medial condyle) and the capitulum (lateral condyle).
One of the parts of the articular portion of the humeral condyle. Shaped like a pulley or spool: it has two rimlike outer margins and a smooth depressed center portion (trochlear sulcus). It is located more medially and articulates with the ulna.
One of the parts of the articular portion of the humeral condyle.
(meaning "little head"), is located on the lateral aspect and articulates with the head of the radius
The small projection on the lateral aspect of the distal humerus above the capitulum.
Larger and more prominent than the lateral and is located on the medial edge of the distal humerus.