The side mirror of a car has a concave surface. posterior gliding of the caput radii on the ulna with pronation. convex: carpals concave: radius [opposite direction] metacarpophalangeal joints, digits 2-5. –Btw concave ulnar notch of radius and convex lower end of ulna –Joint surface enclosed by articular capsule and disc (TFCC) The Organs of the Senses and the Common Integument concave; convex; same Distal moving on proximal row Finger MCP osteokinematics Each phalanx has concave base and convex head ... –Prox arm: lateral midline of ulna, using olecranon and ulnar styloid process for reference –Dist arm: lateral midline of 5thmetacarpal-DO NOT use soft tissue as reference. provides stability. 2. As such, the findings have major therapeutic implications for manual therapy. Proximal Radioulnar Joint •Component and joint play motions Borders: 1. The concave troclear notch of the ulna will roll and slide anterior on the convex trochlea of the humerus What are arthrokinematics of elbow extension seen at the unlo-humeral jt? Uniaxial. OKC = radius & ulna roll & glide posterior & lateral on humerus. A convex polygon is defined as a polygon with all its interior angles less than 180°. Concave and Convex Lenses - The type of lenses which converge the light beam coming from the source to one point on the other side to form an image is called as a convex lens, while the concave lens which is thinner at the centre and gets thicker as we move towards the edges is called as Concave lens. X. BIBLIOGRAPHIC RECORD The palmar capsular ligament (which connects the distal radius to the ulna). It is conCAVE, which means its surface will slide in the SAME direction as the bone’s movement. – Convex: radial head – Concave: ulna (the radial notch) • Active movements – Pronation, supination • Close packed position – 50 supination • Loose packed position – 70 0elbow flexion, 35 forearm supination. during flexion: scaphoid/lunate roll anteriorly (toward palm) and glide posteriorly(toward dorsum) What ligament at the wrist is stretched during supination and what does this provide? ... Olecranal joint formed between ulna and humerus, allowing flexion and extension. The anterior surface of ulnar shaft is rough and nutrient foramen is nearer to the proximal end of the shaft. 2. These two articular surfaces are separated by a prominent ridge, to which the base of the triangular articular disk is attached; this disk separates the wrist-joint from the distal radioulnar articulation. ... and ulna. concave radius and ulna are moving on the convex carpals in the same direction in a closed chain push up, the radius rolls ______ and slides ______. Borders: 1. Concave is an adjective that describes a surface that curves inward, or is thinner in the middle than on the edges. Splanchnology The convex-concave rule is the basis for determining the direction of the mobilizing force when joint mobilization gliding techniques are used to increase a certain joint motion. XI. V. Angiology Ulnar Notch articulation is more often flat than concave; seat more often flat than convex Forearm Rotation •Neutral position –60% of ulnar notch in contact with radius •At extremes of motion –10% of the ulnar notch in contact with radius Supination Palmar ligaments taut PQ taut Pronation Dorsal ligaments taut IOM slack PQ slack DRUJ Stabilizers Convex ulna on concave radius 8 Radiocarpal joint Convex carpals on concave radius 9 Metacarpophalangeal joints (2-5) Concave phalanges on convex metacarpals 10 Proximal and distal interphalangeal joints (2-5) Concave distal phalanges on convex proximal phalanges 11 Hip joint physics having one or two surfaces curved or ground in the shape of a section of the exterior of a sphere, paraboloid, ellipsoid, etca. The Jaw. The medial portion of the articular surface is named the trochlea, and presents a deep depression between two well-marked borders; it is convex from before backward, concave from side to side, and occupies the anterior, lower, and posterior parts of the extremity. An (American) football, which curves outwards, is a good example of a convex shape. Example: A polygon (which has straight sides) is concave when there are "dents" or indentations in it (where the internal angle is greater than 180°). -concave joint surface: trapezium concave posterior to anterior, 1st MC concave lateral to medial-loose-pack midway between flex/ext and abd/add-close-pack position: full opposition-abduction: convex on concave-palmar roll and dorsal glide-adduction: convex on concave-dorsal roll and palmar glide-flexion: concave on convex, medial roll and glide The annular ligament of the elbow extends from the ulna around the head … during open chain elbow extension: ulna rolls and glides posteriorly on humerus. Note that a triangle (3-gon) is always convex. This means that all the vertices of the polygon will point outwards, away from the interior of the shape. Asked By: Marli Revilla | Last Updated: 2nd March, 2020, Instead of moving the ball, move and roll your palm around the stationary ball. The Organs of the Senses and the Common Integument, XII. III. curving or bulging outwards. In open chain movement, the convex surfaces of the scaphoid and lunate move on the concave surfaces of the radius and ulna. How many sides does a convex hexagon have. Ulnar Deviation : Convex - concave rule. The basic difference between concave and convex are as follows: Concave describes a shape that curves inwards. The proximal extremity is short, concave, smooth medially; convex and rough laterally. The proximal extremity is short, concave, smooth medially; convex and rough laterally. Although it is not actually a sellar joint, the ulnar distal facet has a convex and a concave segment, which enables spiral movement during ulnar deviation. It is broader close to the elbow, and narrows as it approaches the wrist.