TBL 10 Flashcards
Bones of arm, wrist, and hand
bone on the lateral side of the forearm
radius
the radius proximally articulates with the ____ and the ____ to form the elbow joint
capitulum of the humerus; radial notch of the ulna
the radius distally articulates with the ____ and ___ in the wrist
head of the ulna; scaphoid and lunate bones
during pronation and supination, the radius rotates about its _____ at its proximal end and circumducts the ___ at its distal end
long axis; ulna
the expanded, round, proximal end of the radius
radial head
shallow concavity for articulation with the humerus capitulum
proximal surface of the radius
part of the radius that articulates with the radial notch of the ulna
periphery of the radius
head of the radius is at its ___ end, while the head of the ulna is at its ___ end
proximal; distal
constricted area immediately distal to the radial head
radial neck
area on the anteromedial, proximal aspect of the radius, distal to the neck
radial tuberosity
the insertion site of the biceps brachii muscle
radial tuberosity
the radial tuberosity is the insertion site for the
biceps brachii muscle
the elongated midportion of the radius that widens along its proximal to distal extent
radial body (shaft)
medial border of the radial shaft forms
sharp crest (interosseous border)
purpose of the interosseous border
attachment of the interosseous membrane
binds together radius and ulna
interosseous membrane
shallow depression on distal, medial aspect of the radius
ulnar notch
articular surface for the head of the ulna
ulnar notch
distal projection from the lateral, distal aspect of the radius
styloid process
extends lateral to the proximal row of carpal bones
styloid process
forms the distal surface of the radius
carpal articular surface
articulates laterally with the scaphoid and medially with the lunate bones
carpal articular surface
bone that lies on the medial side of the forearm
ulna
the ulna proximally articulates with the ___ and ___ in the elbow joint
trochlea of the humerus, head of the radius
the ulna distally articulates with the
ulnar notch of the radius
bone characterized by large, hook-shaped proximal end
ulna
easily palpable proximal end of the ulna
olecranon
forms the “point” of the elbow
olecranon
insertion site of the triceps brachii muscle
olecranon
the olecranon is the insertion site of the
triceps brachii muscle
beaklike tip of the olecanon fits into the ____ of the humerus when the elbow is extended
olecranon fossa
anterior projection forming the inferior end of the proximal end of the ulna
coronoid process
large, crescent-shaped notch on the anterior aspect of the proximal end of the ulna
trochlear notch
articulates with the trochlea of the humerus
trochlear notch of the ulna
articular surface for the head of the radius
radial notch of the ulna
anterior aspect of the coronoid process
ulnar tuberosity
insertion area for the brachialis muscle
ulnar tuberosity
the ulnar tuberosity serves as the insertion point for the
brachialis muscle
elongated midportion of the ulna
ulnar body (shaft)
rounded and subcutaneous and easily palpable along the entire length of the ulna
posterior aspect of the ulnar body
lateral border of the ulnar shaft forms
sharp crest (interosseous border)
the interosseous border is formed by the ___ of the radius and the ___ of the ulna
medial border; lateral border
small, rounded distal end of the ulna
ulnar head
has an articular surface on its lateral side for contact with the ulnar notch of the radius
ulnar head
small projection from the posterolateral, distal end of the ulna
styloid process
the styloid process is a projection from the ___ of the radius and the ___ of the ulna
lateral, distal aspect; posterolateral, distal end
the radial tuberosity is on the ____ of the radius
anteromedial, proximal aspect
strong triangular bands that are medial and lateral thickenings of the fibrous layer of the joint capsule
collateral ligaments
the ligament that extends from the lateral epicondyle of the humerus
lateral radial collateral ligament
the fan-like radial collateral ligament extends from the
lateral epicondyle of the humerus
ligament that encircles and holds the radial head in the radial notch of the ulna
anular ligament
ligament that extends from the medial epicondyle of the humerus to the coronoid process and olecranon of the ulna
medial ulnar collateral ligament
8 small bones comprising of the hand
carpal bones
at birth, the carpal bones are
cartilaginous
what happens to the carpal bones during the first year of growth
the capitate begins to ossify
what happens to the carpal bones by the 12th year of growth
all bones are ossified
the proximal row of the carpal bones contain:
scaphoid, lunate, triquetrum, pisiform
which carpal bones articulate with the radius
scaphoid and lunate
the distal row of the carpal bones contain:
trapezium, trapezoid, capitate, hamate
carpal bone that forms a saddle joint with the first metacarpal bone, allowing great mobility of the thumb
trapezium
central and largest carpal bone
capitate
carpal bone that contains a hook
hamate
the hook-shaped attachment points of the flexor retinaculum
hamulus
largest, most lateral carpal bone of the proximal row
scaphoid
the scaphoid is located in the floor of the
anatomical snuffbox
frequently fractured by impact on the base of the hand when the wrist is hyperextended and abducted
scaphoid
the scaphoid is frequently fractured on the base of the hand when the wrist is
hyperextended and abducted
roughly semilunar-shaped carpal bone located between the scaphoid and triquetrum
lunate
roughly pyramidal-shaped carpal bone
triquetrum
most medial bone in the proximal carpal row
triquetrum
carpal bone that lies anterior to the triquetrum
pisiform